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WO2022033392A1 - 一种衰减器电路及射频前端架构 - Google Patents

一种衰减器电路及射频前端架构 Download PDF

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Publication number
WO2022033392A1
WO2022033392A1 PCT/CN2021/111067 CN2021111067W WO2022033392A1 WO 2022033392 A1 WO2022033392 A1 WO 2022033392A1 CN 2021111067 W CN2021111067 W CN 2021111067W WO 2022033392 A1 WO2022033392 A1 WO 2022033392A1
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WIPO (PCT)
Prior art keywords
attenuation
branch
unit
bypass
common
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PCT/CN2021/111067
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English (en)
French (fr)
Inventor
宋楠
倪建兴
胡自洁
倪楠
曹原
奉靖皓
Original Assignee
锐石创芯（深圳）科技有限公司
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Publication of WO2022033392A1 publication Critical patent/WO2022033392A1/zh

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/24—Frequency- independent attenuators

Definitions

  • the present application relates to the field of radio frequency technology, and in particular, to an attenuator circuit and a radio frequency front-end architecture.
  • radio frequency front-end technology is widely used in remote sensing equipment, wireless communication equipment, radar equipment, portable ultrasonic equipment and other equipment.
  • an attenuator circuit is included in some radio frequency front-end architectures, and the attenuator circuit is used to attenuate the signal.
  • FIG. 1 shows an attenuator circuit applied in a radio frequency front-end architecture in the prior art, and the attenuator circuit includes a bypass path and an attenuation path.
  • the branch paths that do not pass through the attenuator, such as path 1 in Figure 1, are bypass paths; the branch paths that need to pass through the attenuator, such as paths 2, 3, and 4 in Figure 1, are attenuation paths.
  • the present application provides an attenuator circuit and a radio frequency front-end structure to solve the problem of poor attenuation performance caused by excessive parasitic capacitance in the prior art.
  • an attenuator circuit comprising:
  • the first common attenuation module is configured to attenuate signals, the first end of the first common attenuation module is connected to the input node or the output node, the first common attenuation module The second end of is connected with the gate attenuation module;
  • the gated attenuation module includes an optional bypass branch and at least one attenuation branch, and the gated attenuation module is connected in series with the first common attenuation module.
  • the first common attenuation module includes a first common switch and a first common attenuator connected in series, a first end of the first common switch is connected to the input node or the output node, and the first common switch is connected to the input node or the output node. The second end of a common switch is connected to the first common attenuator.
  • the second common attenuation module includes a second common switch and a second common attenuator connected in series, and the first end of the second common switch is connected to the output node or the input node, the second end of the second common switch is connected to the second common attenuator;
  • the gated attenuation module is connected in series with the second common attenuation module.
  • a bypass switch is further included, a first end of the bypass switch is connected to the input node, and a second end of the bypass switch is connected to the output node.
  • the bypass branch in the gated attenuation module includes a bypass unit
  • Each of the attenuation branches includes an attenuation unit and a bypass unit, and the second end of the attenuation unit is connected to the first end of the bypass unit;
  • the gated attenuation module includes an attenuation branch
  • the common contact between the first end of the attenuation unit in the attenuation branch and the first end of the bypass unit in the bypass branch is used as the The first end of the gated attenuation module
  • the common contact between the second end of the bypass unit in the attenuation branch and the second end of the bypass unit in the bypass branch is used as the gate the second end of the attenuation module
  • N is a positive integer greater than or equal to 2
  • the first end of the attenuation unit in the first attenuation branch is connected to the bypass unit in the bypass branch.
  • the common junction between the first ends is used as the first end of the gated attenuation module, starting from the second attenuation branch, the first end of the attenuation unit in each attenuation branch is connected to the previous attenuation branch.
  • the connection point between the attenuation unit and the bypass unit; the common junction between the second ends of the bypass units of the N attenuation branches and the second ends of the bypass units in the bypass branch is used as the selection pass through the second end of the attenuation module.
  • both the bypass unit of the bypass branch and the bypass unit of the attenuation branch include a switch.
  • the attenuation unit of each attenuation branch includes a branch switch and a branch attenuator connected in series;
  • the first end of the branch switch serves as the first end of the attenuation unit
  • the second end of the branch switch is connected to the first end of the branch attenuator
  • the second end of the branch attenuator is connected to the first end of the branch attenuator.
  • the terminal is used as the second terminal of the attenuation unit.
  • the bypass branch in the gated attenuation module includes a bypass unit
  • Each of the attenuation branches includes an attenuation unit and a bypass unit, wherein the second end of the attenuation unit is connected to the first end of the bypass unit of the attenuation branch;
  • the common junction between the first end of the attenuation unit of the attenuation branch and the first end of the bypass unit of the bypass branch is used as the first end of the gated attenuation module.
  • the common junction between the second end of the bypass unit and the second end of the bypass unit of the bypass branch is used as the second end of the gating attenuation module.
  • both the bypass unit of the bypass branch and the attenuation unit of the attenuation branch include a switch.
  • the attenuation unit includes a branch switch and a branch attenuator connected in series;
  • the first end of the branch switch serves as the first end of the attenuation unit
  • the second end of the branch switch is connected to the first end of the branch attenuator
  • the second end of the branch attenuator is connected to the first end of the branch attenuator.
  • the terminal is used as the second terminal of the attenuation unit.
  • the bypass branch in the gated attenuation module includes a bypass unit
  • the attenuation branch includes a first attenuation unit and a bypass unit, and the second end of the first attenuation unit is connected to the first end of the bypass unit ;
  • the common junction between the first end of the first attenuation unit and the first end of the bypass unit in the bypass branch is used as the first end of the gated attenuation module, and the attenuation branch in the The common junction between the second end of the bypass unit and the second end of the bypass unit in the bypass branch is used as the second end of the gated attenuation module;
  • the first end of the first attenuation branch is connected; the common joint between the first end of the first attenuation unit in the first attenuation branch and the first end of the bypass unit in the bypass branch is used as the gated attenuation module
  • the first end of the first attenuation branch, the common joint between the second end of the second attenuation unit in the first attenuation branch and the second end of the bypass unit in the bypass branch is used as the gate of the gated attenuation module.
  • each the second end of the second attenuation unit in the attenuation branch is connected to the connection point of the first attenuation unit and the bypass unit of the previous attenuation branch, each the second end of the second attenuation unit in the attenuation branch is connected to the connection point of the bypass unit of the previous attenuation branch and the second attenuation unit;
  • the Nth attenuation branch includes a first attenuation unit and a bypass unit, the second end of the first attenuation unit is connected to the first end of the bypass unit; the first attenuation of the Nth attenuation branch The first end of the unit is connected to the connection point of the first attenuation unit of the previous attenuation branch and the bypass unit, and the second end of the bypass unit of the Nth attenuation branch is connected to the bypass unit of the previous attenuation branch.
  • both the bypass unit of the bypass branch and the bypass unit of the attenuation branch include a switch.
  • the first attenuation unit includes a first branch switch and a first branch attenuator connected in series, wherein the first end of the first branch switch serves as the first end of the first attenuation unit , the second end of the first branch switch is connected to the first end of the first branch attenuator, and the second end of the first branch attenuator serves as the second end of the first attenuation unit ;
  • the second attenuation unit includes a second branch attenuator and a second branch switch connected in series, wherein the first end of the second branch attenuator serves as the first end of the second attenuation unit, the The second end of the second branch attenuator is connected to the first end of the second branch switch, and the second end of the second branch switch serves as the second end of the second attenuation unit.
  • a radio frequency front-end architecture includes a low noise amplifier and the above attenuator circuit, wherein the attenuator circuit is connected in series before the low noise amplifier and/or after the amplification stage.
  • the attenuator circuit includes an input node; an output node; a first common attenuation module, the first common attenuation module is configured to attenuate signals, and a first end of the first common attenuation
  • the input node or the output node, the second end of the first common attenuation module is connected to the gated attenuation module; the gated attenuation module includes an optional bypass branch and at least one attenuation branch.
  • the pass attenuation module is connected in series with the first common attenuation module.
  • the connection relationship between the original attenuation branches is changed, thereby effectively reducing the parasitic capacitance generated on other paths when the input signal passes through any path, thereby reducing the generation of the attenuator circuit.
  • the parasitic capacitance is beneficial to optimize the attenuation performance of the attenuator circuit.
  • 1 is a schematic diagram of an existing attenuator circuit
  • FIG. 2 is a schematic diagram of an attenuator circuit provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of an attenuator circuit provided by another embodiment of the present application.
  • FIG. 4 is a schematic diagram of an attenuator circuit provided by another embodiment of the present application.
  • FIG. 5 is a schematic diagram of an attenuator circuit provided by another embodiment of the present application.
  • FIG. 6 is a schematic diagram of an attenuator circuit provided by another embodiment of the present application.
  • FIG. 7 is a schematic diagram of an attenuator circuit provided by another embodiment of the present application.
  • FIG. 8 is a schematic diagram of an attenuator circuit provided by another embodiment of the present application.
  • FIG. 9 is a schematic diagram of a T-type attenuator provided by an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a ⁇ -type attenuator provided by an embodiment of the present application.
  • the present application provides an attenuator circuit, comprising an input node; an output node; a first common attenuation module and a gated attenuation module connected in series with each other, wherein a first end of the first common attenuation module is connected to the input node or all
  • the output node the first common attenuation module is configured to attenuate the signal
  • the gated attenuation module includes an optional bypass branch and at least one attenuation branch.
  • a first common attenuator is included in the first common attenuator, the first end of the first common attenuator is connected to the input node or the output node, and the second end of the first common attenuator is connected to the selector. connected through the attenuation module.
  • FIG. 2 is a schematic diagram of an attenuator circuit according to an embodiment of the present application.
  • the attenuator circuit can be applied in RF front-end circuits, such as variable gain amplifiers, low noise amplifiers and power amplifiers, etc., connected in series before the amplifiers (variable gain amplifiers, low noise amplifiers or power amplifiers) and/or amplifiers Later.
  • the attenuator circuit includes an input node and an output node;
  • a first common attenuation module 10 the first common attenuation module 10 is configured to attenuate signals, a first end of the first common attenuation module 10 is connected to the input node or the output node, the first The second end of the common attenuation module 10 is connected to the gated attenuation module 20;
  • the gated attenuation module 20 includes an optional bypass branch and at least one attenuation branch, and the gated attenuation module 20 is connected in series with the first common attenuation module 10 .
  • the first common attenuation module 10 and the gated attenuation module 20 are connected in series between the input node and the output node of the attenuator circuit. Wherein, when the parasitic capacitance needs to be improved at the input node, the first end of the first common switch 11 is connected to the input node.
  • the first common attenuation module 10 is used to attenuate the input signal once.
  • the gated attenuation module 20 includes a user-selectable bypass branch and at least one attenuation branch.
  • Each attenuation branch corresponds to an attenuation value, which is used to perform secondary attenuation on the output signal of the first common attenuation module 10 according to the corresponding attenuation value, thereby extending various attenuation degrees of the input signal.
  • the first end of the first common switch 11 is connected to the output node.
  • the gated attenuation module 20 includes a user-selectable bypass branch and at least one attenuation branch.
  • Each of the attenuation branches corresponds to an attenuation value, which is used to attenuate the input signal once according to the corresponding attenuation value;
  • the first common attenuation module 10 is used to perform secondary attenuation on the output signal of the gated attenuation module 20 Attenuation, thereby extending various degrees of attenuation to the input signal.
  • the first common attenuation module 10 includes a first common switch 11 and a first common attenuator 12 connected in series, and a first end of the first common switch 11 is connected to the input node Or at the output node, the second end of the first common switch 11 is connected to the first common attenuator 12 .
  • the first end of the first common switch 11 is connected to the input node, and the second end of the first common switch 11 is connected to the first end of the first common attenuator 12
  • the second end of the first common attenuator 12 is connected to the first end of the gated attenuation module 20, and the second end of the gated attenuation module 20 is connected to the output node.
  • the first common attenuation module 10 is used to attenuate the input signal once, and the attenuation degree of the signal is performed according to the attenuation value set in the first common attenuator 12 .
  • the gated attenuation module 20 includes a user-selectable bypass branch and at least one attenuation branch.
  • Each attenuation branch corresponds to an attenuation value, which is used to perform secondary attenuation on the output signal of the first common attenuation module 10 according to the corresponding attenuation value, thereby extending various attenuation degrees of the input signal.
  • the first end of the first common switch 11 is connected to the output node, and the second end of the first common switch 11 is connected to the output node.
  • the first end of the first common attenuator 12 is connected, the second end of the first common attenuator 12 is connected to the first end of the gated attenuation module 20 , and the second end of the gated attenuation module 20 is connected the input node.
  • the gated attenuation module 20 includes a user-selectable bypass branch and at least one attenuation branch.
  • Each of the attenuation branches corresponds to an attenuation value, which is used to attenuate the input signal once according to the corresponding attenuation value; the first common attenuation module 10 is used to perform secondary attenuation on the output signal of the gated attenuation module 20 Attenuation, the attenuation degree of the signal is performed according to the attenuation value set in the first common attenuator 12, thereby extending various different attenuation degrees to the input signal.
  • the attenuation path between the first common attenuation module 10 and the gated attenuation module 20 is in a series relationship, when the first common attenuation module 10 is gated with any branch in the gated attenuation module 20, When it is used to attenuate the input signal, based on the calculation method of the series-parallel connection of capacitors, the parasitic capacitances generated on other paths in the attenuator circuit will be smaller than that of the prior art by directly connecting the parasitic capacitances on each of the other paths in parallel.
  • the obtained value can effectively reduce the parasitic capacitance generated in the process of attenuating the input signal, thereby reducing the parasitic capacitance generated by the attenuator circuit, which is conducive to optimizing the attenuation performance of the attenuator circuit.
  • the attenuator circuit further includes a second common attenuation module 30 , and the second common attenuation module
  • Two common attenuators 32 are connected; the gate attenuator module 20 is connected in series with the second common attenuator module 30 .
  • a second common attenuation module 30 can be added on the basis of the embodiment in FIG. 3 .
  • the second common attenuation module 30 corresponds to the first common attenuation module 10, and when the first common attenuation module 10 is used to connect an input node, the second common attenuation module 30 is used to connect an output node. That is, the first end of the first common switch 11 is connected to the input node, and the first end of the second common switch 31 is connected to the output node.
  • the first common attenuation module 10 is used to attenuate the input signal once, and the attenuation degree of the signal is performed according to the attenuation value set in the first common attenuator 12 .
  • the gated attenuation module 20 is configured to perform secondary attenuation on the output signal of the first common attenuation module 10 according to the attenuation value corresponding to the branch selected by the user.
  • the second common attenuation module 30 is used to attenuate the output signal of the gated attenuation module 20 three times.
  • the second common attenuation module 30 is used to connect an input node. That is, the first end of the first common switch 11 is connected to the output node, and the first end of the second common switch 31 is connected to the input node.
  • the second common attenuation module 30 is used to attenuate the input signal once, and the attenuation degree of the signal is performed according to the attenuation value set in the second common attenuator 32 .
  • the gate attenuation module 20 is configured to perform secondary attenuation on the output signal of the second common attenuation module 30 according to the attenuation value corresponding to the branch selected by the user.
  • the first common attenuation module 10 is used to attenuate the output signal of the gated attenuation module 20 three times.
  • the parasitic capacitance generated on other attenuation paths in the attenuator circuit will be smaller than the value obtained by directly connecting the parasitic capacitance on each other path in parallel in the prior art;
  • the attenuation path between the second common attenuation module 30 and the gated attenuation module 20 is in a series relationship, when a branch in the second common attenuation module 30 and the gated attenuation module 20 is used to attenuate the input signal, From the output node, the parasitic capacitances generated on other attenuation paths in the attenuator circuit at this time will be smaller than the value obtained by directly connecting the parasitic capacitances on each of the
  • the attenuator circuit provided by the embodiment of the present application effectively reduces the parasitic capacitance generated in the process of attenuating the input signal, thereby reducing the parasitic capacitance generated by the attenuator circuit, which is conducive to optimizing the attenuation of the attenuator circuit performance.
  • the attenuator circuit may further include a bypass path, and the bypass path includes a bypass switch 40 .
  • the first end of the bypass switch 40 is connected to the input node, and the second end is connected to the output node, as shown in FIG. 5 .
  • the bypass switch 40 acts as a selection switch of the bypass path. If the input signal does not need to be attenuated, by closing the bypass switch 40 on the bypass path, the input signal directly passes through the bypass path and is output.
  • FIG. 5 is provided on the basis of the example of FIG. 3 , and in other embodiments, the bypass switch 40 may also be applied to the example of FIG. 4 , which is not limited here.
  • the bypass branch in the gated attenuation module includes a bypass unit
  • Each of the attenuation branches includes an attenuation unit and a bypass unit, and the second end of the attenuation unit is connected to the first end of the bypass unit;
  • the gated attenuation module includes an attenuation branch
  • the common contact between the first end of the attenuation unit in the attenuation branch and the first end of the bypass unit in the bypass branch is used as the The first end of the gated attenuation module
  • the common contact between the second end of the bypass unit in the attenuation branch and the second end of the bypass unit in the bypass branch is used as the gate the second end of the attenuation module
  • N is a positive integer greater than or equal to 2; the first end of the attenuation unit in the first attenuation branch and the bypass unit in the bypass branch
  • the common junction between the first ends is used as the first end of the gated attenuation module, starting from the second attenuation branch, the first end of the attenuation unit in each attenuation branch is connected to the previous attenuation branch.
  • the connection point between the attenuation unit and the bypass unit; the common junction between the second ends of the bypass units of the N attenuation branches and the second ends of the bypass units in the bypass branch is used as the selection pass through the second end of the attenuation module.
  • the bypass unit of the bypass branch includes a switch for gating the bypass branch.
  • the bypass unit of the attenuation branch includes a switch for gating the attenuation branch.
  • the attenuation unit of each attenuation branch includes a branch switch and a branch attenuator connected in series; wherein the first end of the branch switch serves as the first end of the attenuation unit, and the first end of the branch switch is used as the first end of the attenuation unit.
  • the two ends are connected to the first end of the branch attenuator, and the second end of the branch attenuator serves as the second end of the attenuation unit.
  • the gated attenuation module 20 includes a first switch 21, a second switch 22, a first branch attenuator 23, a third switch 24, a fourth switch 25, a second branch attenuator 26, the fifth switch 27;
  • the common contact between the first end of the first switch 21 and the first end of the second switch 22 is used as the first end of the gate attenuation module 20;
  • the second end of the second switch 22 is connected to the first end of the first branch attenuator 23;
  • the common contact between the second end of the first branch attenuator 23 and the first end of the third switch 24 is connected to the first end of the fourth switch 25;
  • the second end of the fourth switch 25 is connected to the first end of the second branch attenuator 26;
  • the second end of the second branch attenuator 26 is connected to the first end of the fifth switch 27;
  • the common contact between the second end of the first switch 21 , the second end of the third switch 24 , and the second end of the fifth switch 27 is used as the output end of the gate attenuation module 20 .
  • the signal attenuation values of the first branch attenuator 23 and the second branch attenuator 26 may be the same or different, which are not limited here.
  • the first switch 21 serves as a bypass unit of the bypass branch, and forms a first attenuation path with the first common attenuation module 10 and/or the second common attenuation module 30 .
  • the second switch 22 and the first branch attenuator 23 serve as the attenuation unit of the first attenuation branch
  • the third switch 24 serves as the bypass unit of the first attenuation branch
  • the first common attenuation module 10 and/or Or the second common attenuation module 30 constitutes a second attenuation path.
  • the fourth switch 25 and the second branch attenuator 26 are used as the attenuation unit of the second attenuation branch, and the fifth switch 27 is used as the bypass unit of the second attenuation branch, combined with the attenuation unit of the first attenuation branch , forming a third attenuation path with the first common attenuation module 10 and/or the second common attenuation module 30 . Therefore, the corresponding attenuation path can be selected by closing the corresponding switch according to the attenuation degree of the signal.
  • the attenuator circuit includes a first common attenuator module 10 and a gated attenuator module 20, the attenuation value corresponding to the first common attenuator 12 is 2dB, the first branch attenuator The attenuation value corresponding to 23 is 3dB, and the attenuation value corresponding to the second branch attenuator 26 is 4dB. If the input signal needs to be attenuated by 2dB, the first common switch 11 and the first switch 21 on the bypass branch are closed, and the other switches are opened, and the input signal will pass through the first common attenuator 12 for 2dB attenuation.
  • the parasitic capacitance generated by the attenuator circuit is: the parasitic capacitance corresponding to the fifth switch 27 is connected in series with the parasitic capacitance corresponding to the fourth switch 25, and then connected in parallel with the parasitic capacitance corresponding to the third switch 24, and then The value obtained by connecting the parasitic capacitance corresponding to the second switch 22 in series; it can be seen that the parasitic capacitance is smaller than the value obtained by directly connecting the parasitic capacitance on each other attenuation path in parallel in the prior art.
  • the first common switch 11 , the second switch 22 , and the third switch 24 are closed, and the other switches are opened.
  • the input signal will pass through the first common attenuator 12 for 2dB signal attenuation, and then pass through the first branch attenuator 23 for 3dB signal attenuation; at this time, the parasitic capacitance generated by the attenuator circuit includes two parts: one is the bypass branch.
  • the parasitic capacitance corresponding to the first switch 31 on the road, and the second is the value obtained by connecting the parasitic capacitance corresponding to the fourth switch 25 on the third attenuation branch and the parasitic capacitance corresponding to the fifth switch 27 in series; it can be seen that the two Part of the parasitic capacitance is smaller than the value obtained by directly connecting the parasitic capacitances on each of the other attenuation paths in parallel in the prior art.
  • the first common switch 11, the second switch 22, the fourth switch 25, and the fifth switch 27 are closed, and the other switches are opened, and the input signal will pass through the first
  • the common attenuator 12 performs 2dB signal attenuation, then passes through the first branch attenuator 23 for 3dB signal attenuation, and finally passes through the second attenuator 26 for 4dB signal attenuation; at this time, the parasitic capacitance generated by the attenuator circuit includes two Parts: one is the parasitic capacitance corresponding to the first switch 21 on the bypass branch, and the other is the parasitic capacitance corresponding to the third switch 24 on the first attenuation branch; it can be seen that the parasitic capacitance of the two parts is smaller than the prior art. The value of the parasitic capacitance on each other attenuation path is directly connected in parallel.
  • a sixth switch may be further connected between the second branch attenuator 26 and the fifth switch 27 to construct the next attenuation branch.
  • the number of specific branches is set according to actual needs, and there is no limit here.
  • FIG. 6 is a schematic structural diagram of the gating attenuation module proposed on the basis of the example of FIG. 3 , and is not used to limit the embodiments of the present application.
  • the above-mentioned gate attenuation module is also applicable to the example in FIG. 4 or FIG. 5 , which is not limited here.
  • bypass branch in the gated attenuation module includes a bypass unit
  • Each of the attenuation branches includes an attenuation unit and a bypass unit, and the second end of the attenuation unit is connected to the first end of the bypass unit;
  • the common junction between the first end of the attenuation unit of the attenuation branch and the first end of the bypass unit of the bypass branch is used as the first end of the gated attenuation module.
  • the common junction between the second end of the bypass unit and the second end of the bypass unit of the bypass branch is used as the second end of the gating attenuation module.
  • both the bypass unit of the bypass branch and the attenuation unit of the attenuation branch include a switch.
  • the attenuation unit includes a branch switch and a branch attenuator connected in series;
  • the first end of the branch switch in the attenuation unit is used as the first end of the attenuation unit, and the second end of the branch switch is connected to the first end of the branch attenuator, so The second end of the branch attenuator serves as the second end of the attenuation unit.
  • the gated attenuation module 20 includes a first switch 21, a second switch 22, a first branch attenuator 23, a third switch 24, a fourth switch 25, a second branch attenuator 26, Fifth switch 27 .
  • the common contact between the first end of the first switch 21 , the first end of the second switch 22 , and the first end of the fourth switch 25 is used as the first end of the gate attenuation module 20 ;
  • the second end of the second switch 22 is connected to the first end of the first branch attenuator 23;
  • the second end of the first branch attenuator 23 is connected to the first end of the third switch 24;
  • the second end of the fourth switch 25 is connected to the first end of the second branch attenuator 26;
  • the second end of the second branch attenuator 26 is connected to the first end of the fifth switch 27;
  • the common contact between the second end of the first switch 21 , the second end of the third switch 24 , and the second end of the fifth switch 27 is used as the output end of the gate attenuation module 20 .
  • the attenuation values of the first branch attenuator 22 and the second branch attenuator 26 may be the same or different, which are not limited here.
  • the first switch 21 serves as a bypass unit of the bypass branch, and forms a first attenuation path with the first common attenuation module 10 and/or the second common attenuation module 30 .
  • the second switch 22 and the first branch attenuator 23 serve as the attenuation unit of the first attenuation branch
  • the third switch 24 serves as the bypass unit of the first attenuation branch
  • the first common attenuation module 10 and/or Or the second common attenuation module 30 constitutes a second attenuation path.
  • the fifth switch 25 and the second branch attenuator 26 serve as the attenuation unit of the second attenuation branch
  • the fifth switch 27 serves as the bypass unit of the second attenuation branch
  • the first common attenuation module 10 and/or Or the second common attenuation module 30 constitutes a third attenuation path.
  • the user can select the corresponding attenuation path by closing the switch according to the attenuation degree of the signal.
  • the attenuator circuit includes a first common attenuation module 10 and a gated attenuation module 20, and it is assumed that the attenuation value corresponding to the first common attenuator 12 is 3dB, and the first branch attenuation The attenuation value corresponding to the attenuator 23 is 6dB, and the attenuation value corresponding to the second branch attenuator 26 is 12dB.
  • the parasitic capacitance generated by the attenuator circuit is: the parasitic capacitance corresponding to the fourth switch 25 is connected in series with the parasitic capacitance corresponding to the fifth switch 27, the parasitic capacitance of the second switch 22 is connected in series with the parasitic capacitance of the third switch 24, and then The value obtained by connecting the two parts in series with the parasitic capacitance corresponding to the first switch 21 on the bypass branch in parallel; it can be seen that the parasitic capacitance will be smaller than that obtained by directly paralleling the parasitic capacitance on each of the other attenuation paths in the prior art value of .
  • the input signal needs to be attenuated by 9dB, then the first common switch 11 , the second switch 22 , and the third switch 24 are closed, and the other switches are open, and the input signal will pass through the first common attenuator 12 for 3dB attenuation.
  • the signal attenuated by the second branch circuit is attenuated by 6dB, and then the signal attenuated by the second branch attenuator 13; at this time, the parasitic capacitance generated by the attenuator circuit includes two parts: one is the parasitic capacitance corresponding to the first switch 21 of the bypass branch.
  • the second is the value obtained by connecting the parasitic capacitance corresponding to the fourth switch 25 on the second attenuation branch with the parasitic capacitance corresponding to the fifth switch 27 in series; it can be seen that the parasitic capacitances of the two parts are smaller than those of the other components in the prior art.
  • the first common switch 12 , the fourth switch 25 and the fifth switch 27 are closed, and the other switches are opened, and the input signal will pass through the first common attenuator 22 for 3dB attenuation.
  • the signal is attenuated and then attenuated by 12dB through the second branch attenuator 26; at this time, the parasitic capacitance generated by the attenuator circuit is: the parasitic capacitance corresponding to the second switch 22 and the third switch 24 on the first attenuation branch
  • FIG. 7 is a schematic structural diagram of the gating attenuation module proposed on the basis of the example of FIG. 3 , and is not used to limit the embodiments of the present application.
  • the above-mentioned gate attenuation module is also applicable to the example in FIG. 4 or FIG. 5 , which is not limited here.
  • bypass branch in the gated attenuation module includes a bypass unit
  • the attenuation branch includes a first attenuation unit and a bypass unit, and the second end of the first attenuation unit is connected to the first end of the bypass unit ;
  • the common junction between the first end of the first attenuation unit and the first end of the bypass unit in the bypass branch is used as the first end of the gated attenuation module, and the attenuation branch in the The common junction between the second end of the bypass unit and the second end of the bypass unit in the bypass branch is used as the second end of the gated attenuation module;
  • N is a positive integer greater than or equal to 2;
  • the first end, the common joint between the second end of the second attenuation unit in the first attenuation branch and the second end of the bypass unit in the bypass branch is used as the first terminal of the gated attenuation module.
  • the Nth attenuation branch includes a first attenuation unit and a bypass unit, the second end of the first attenuation unit is connected to the first end of the bypass unit; the first attenuation of the Nth attenuation branch The first end of the unit is connected to the connection point of the first attenuation unit of the previous attenuation branch and the bypass unit, and the second end of the bypass unit of the Nth attenuation branch is connected to the bypass unit of the previous attenuation branch.
  • both the bypass unit of the bypass branch and the bypass unit of the attenuation branch include a switch.
  • the first attenuation unit includes a first branch switch and a first branch attenuator connected in series, wherein the first end of the first branch switch serves as the first end of the first attenuation unit , the second end of the first branch switch is connected to the first end of the first branch attenuator, and the second end of the first branch attenuator serves as the second end of the first attenuation unit ;
  • the second attenuation unit includes a second branch attenuator and a second branch switch connected in series, wherein the first end of the second attenuator serves as the first end of the second branch attenuation unit, the The second end of the second branch attenuator is connected to the first end of the second branch switch, and the second end of the second branch switch serves as the second end of the second attenuation unit.
  • the gated attenuation module includes one bypass branch and two attenuation branches, and the attenuation branches are respectively denoted as a first attenuation branch and a second attenuation branch.
  • the gate attenuation module 20 includes a first switch 21, a second switch 22, a first branch attenuator 23, a third switch 24, a second branch attenuator 25, a fourth switch 26, the fifth switch 27, the third branch attenuator 28, the sixth switch 29;
  • the common contact between the first end of the first switch 21 and the first end of the second switch 22 is used as the first end of the gate attenuation module 20;
  • the second end of the second switch 22 is connected to the first end of the first branch attenuator 23;
  • the common contact between the second end of the first branch attenuator 23 and the first end of the third switch 24 is connected to the fifth switch 27;
  • the second end of the fifth switch 27 is connected to the first end of the third branch attenuator 28;
  • the second end of the third branch attenuator 28 is connected to the first end of the sixth switch 29;
  • the common contact between the second end of the sixth switch 29 and the second end of the third switch 24 is connected to the first end of the second branch attenuator 25;
  • the second end of the second branch attenuator 25 is connected to the first end of the fourth switch 26;
  • the common contact between the second end of the fourth switch 26 and the second end of the first switch 21 serves as the second end of the gate attenuation module 20 .
  • the attenuation values of the first branch attenuator 23 , the second branch attenuator 25 , and the third branch attenuator 28 may be the same or different, which are not limited here.
  • the first switch 21 serves as a bypass unit of the bypass branch, and forms a first attenuation path with the first common attenuation module 10 and/or the second common attenuation module 30 .
  • the second switch 22 and the first branch attenuator 23 serve as the first attenuation unit of the first attenuation branch
  • the third switch 24 serves as the bypass unit of the first attenuation branch
  • the second branch attenuates
  • the switch 25 and the fourth switch 26 serve as the second attenuation unit of the first attenuation branch, and form a second attenuation path with the first common attenuation module 10 and/or the second common attenuation module 30 .
  • the fifth switch 27 and the third branch attenuator 28 are used as the first attenuation unit of the second attenuation branch, and the sixth switch 29 is used as the bypass unit of the second attenuation branch, combined with the first attenuation branch.
  • the first attenuation unit and the second attenuation unit of the circuit and the first common attenuation module 10 and/or the second common attenuation module 30 form a third attenuation path.
  • the user can select the corresponding attenuation path by closing the switch according to the attenuation degree of the signal.
  • FIG. 8 is a schematic structural diagram of the gating attenuation module proposed on the basis of the example of FIG. 3 , and is not used to limit the embodiments of the present application.
  • the above-mentioned gate attenuation module is also applicable to the example in FIG. 4 or FIG. 5 , which is not limited here.
  • both the common attenuator and the branch attenuator are two-port networks composed of resistive elements, the impedance and the attenuation are constants independent of frequency, and the phase shift is equal to zero.
  • the common attenuators and branch attenuators include but are not limited to T-type attenuators or ⁇ -type attenuators.
  • the T-type attenuator includes a first resistor R11, a second resistor R12, and a third resistor R13, wherein one end of the first resistor R11, the second resistor R12, and the third resistor R13 are connected in common, so The other end of the first resistor R11 is used as an input end, and the other end of the third resistor R13 is used as an output end.
  • the ⁇ -type attenuator includes a first resistor R21, a second resistor R22, and a third resistor R23, wherein the common junction of the first resistor R21 and the second resistor R22 is used as an input terminal, and the first resistor R21 and the second resistor R22 The common junction of the resistor R21 and the third resistor R23 is used as the output terminal.
  • the attenuator circuit provided by the embodiment of the present application can effectively reduce the parasitic capacitance generated during the process of attenuating the input signal, thereby reducing the parasitic capacitance generated by the attenuator circuit, which is beneficial to optimizing the radio frequency
  • the attenuation performance of the front-end architecture can effectively reduce the parasitic capacitance generated during the process of attenuating the input signal, thereby reducing the parasitic capacitance generated by the attenuator circuit, which is beneficial to optimizing the radio frequency
  • the attenuation performance of the front-end architecture can effectively reduce the parasitic capacitance generated during the process of attenuating the input signal, thereby reducing the parasitic capacitance generated by the attenuator circuit, which is beneficial to optimizing the radio frequency
  • Embodiments of the present application further provide a radio frequency front-end architecture, where the radio frequency front-end architecture includes a low-noise amplifier and the above-mentioned attenuator circuit, where the attenuator circuit is connected in series before the low-noise amplifier and/or an amplifier stage Later. Since the parasitic capacitance of the attenuator circuit is small, the attenuation performance is improved compared to the prior art, so that the attenuation performance of the radio frequency front-end architecture is greatly optimized.

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Abstract

提供了一种衰减器电路，包括：输入节点；输出节点；第一公共衰减模块（10），第一公共衰减模块（10）被配置为对信号进行衰减，第一公共衰减模块（10）的第一端连接输入节点或者输出节点，第一公共衰减模块（10）的第二端与选通衰减模块（20）连接；选通衰减模块（20），包括可供选择的旁路支路和至少一个衰减支路，选通衰减模块（20）与第一公共衰减模块（10）串联连接，有效地减少了衰减器电路的寄生电容，解决了由于寄生电容过大而导致衰减性能欠佳的问题。

Description

一种衰减器电路及射频前端架构
本申请以2020年08月13日提交的申请号为2020108129730，名称为“一种衰减器电路及射频前端架构”的中国发明申请为基础，并要求其优先权。
技术领域
本申请涉及射频技术领域，尤其涉及一种衰减器电路及射频前端架构。
背景技术
在射频(Radio Frequency，简称RF)的电子应用中，射频前端技术被广泛地应用在遥感设备、无线通信设备、雷达设备、便携式超声波等设备中。其中，在某些射频前端架构内包括衰减器电路，所述衰减器电路用于对信号进行衰减。
图1为现有技术中应用于射频前端架构中的衰减器电路，该衰减器电路包括旁路路径和衰减路径。其中，不经过衰减器的支路路径，如图1中的路径1，为旁路路径；需经过衰减器的支路路径，如图1中的路径2、3和4，为衰减路径。
然而，现有的衰减器电路在对信号进行衰减的过程中，当输入信号经过任意一路径时会在其它路径上产生过大的寄生电容，进而导致衰减器电路因寄生电容过大而出现衰减性能不够理想的情况。
申请内容
本申请提供一种衰减器电路及射频前端架构，以解决现有技术由于寄生电容过大而导致衰减性能欠佳的问题。
本申请的是这样实现的，一种衰减器电路，包括：
输入节点；
输出节点；
第一公共衰减模块，所述第一公共衰减模块被配置为对信号进行衰减，所述第一公共衰减模块的第一端连接所述输入节点或者所述输出节点，所述第一公共衰减模块的第二端与选通衰减模块连接；
选通衰减模块，包括可供选择的旁路支路和至少一个衰减支路，所述选通衰减模块与所述第一公共衰减模块串联连接。
可选地，所述第一公共衰减模块包括串联连接的第一公共开关和第一公共衰减器，所述第一公共开关的第一端连接所述输入节点或者所述输出节点，所述第一公共开关的第二端与所述第一公共衰减器连接。
可选地，还包括第二公共衰减模块，所述第二公共衰减模块包括串联连接的第二公共开关和第二公共衰减器，所述第二公共开关的第一端连接所述输出节点或者所述输入节点，所述第二公共开关的第二端与所述第二公共衰减器连接；
所述选通衰减模块与所述第二公共衰减模块串联连接。
可选地，还包括旁路开关，所述旁路开关的第一端与所述输入节点连接，第二端与所述输出节点连接。
可选地，所述选通衰减模块中的旁路支路包括一旁路单元；
每一所述衰减支路包括一衰减单元和一旁路单元，所述衰减单元的第二端与所述旁路单元的第一端连接；
当所述选通衰减模块包括一个衰减支路时，所述衰减支路中的衰减单元的第一端与所述旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，所述衰减支路中的旁路单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端；
当所述选通衰减模块包括N个衰减支路时，N为大于或等于2的正整数，第一个衰减支路中的衰减单元的第一端与旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，从第二个衰减支路起，每一个衰减支路中的衰减单元的第一端连接到前一个衰减支路的衰减单元和旁路单元的连接点；所述N个衰减支路的旁路单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端。
可选地，所述旁路支路的旁路单元和所述衰减支路的旁路单元均包括一开关。
可选地，每一所述衰减支路的衰减单元包括串联连接的支路开关和支路衰减器；
所述支路开关的第一端作为所述衰减单元的第一端，所述支路开关的第二端与所述支路衰减器的第一端连接，所述支路衰减器的第二端作为所述衰减单元的第二端。
可选地，所述选通衰减模块中的旁路支路包括一旁路单元；
每一所述衰减支路包括一衰减单元和一旁路单元，其中，所述衰减单元的第二端与所述衰减支路的旁路单元的第一端连接；
所述衰减支路的衰减单元的第一端与所述旁路支路的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，所述衰减支路的旁路单元的第二端与所述旁路支路的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端。
可选地，所述旁路支路的旁路单元和衰减支路的衰减单元均包括一开关。
可选地，所述衰减单元包括串联连接的支路开关和支路衰减器；
所述支路开关的第一端作为所述衰减单元的第一端，所述支路开关的第二端与所述支路衰减器的第一端连接，所述支路衰减器的第二端作为所述衰减单元的第二端。
可选地，所述选通衰减模块中的旁路支路包括一旁路单元；
当所述选通衰减模块包括一个衰减支路时，所述衰减支路包括第一衰减单元、旁路单元，所述第一衰减单元的第二端与所述旁路单元的第一端连接；所述第一衰减单元的第一端与所述旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，所述衰减支路中的旁路单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端；
当所述选通衰减模块包括N个衰减支路时，N为大于或等于2的正整数，第n个衰减支路包括第一衰减单元、旁路单元、第二衰减单元，其中，n＝1，2，3……，N-1，所述第一衰减单元的第二端与所述旁路单元的第一端连接，所述旁路单元的第二端与所述第二衰减单元的第一端连接；第一个衰减支路中的第一衰减单元的第一端与所述旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，第一个衰减支路中的第二衰减单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端；从第二个衰减支路起，每一个衰减支路中的第一衰减单元的第一端连接到前一个衰减支路的第一衰减单元和旁路单元的连接点，每一个衰减支路中的第二衰减单元的第二端连接到前一个衰减支路的旁路单元和第二衰减单元的连接点；
第N个衰减支路包括第一衰减单元和旁路单元，所述第一衰减单元的第二端与所述旁路单元的第一端连接；所述第N个衰减支路的第一衰减单元的第一端连接到前一个衰减支路的第一衰减单元和旁路单元的连接点，所述第N个衰减支路的旁路单元的第二端连接到前一个衰减支路的旁路单元与第二衰减单元的连接点。
可选地，所述旁路支路的旁路单元和衰减支路的旁路单元均包括一开关。
可选地，所述第一衰减单元包括串联连接的第一支路开关和第一支路衰减器，其中所述第一支路开关的第一端作为所述第一衰减单元的第一端，所述第一支路开关的第二端与所述第一支路衰减器的第一端连接，所述第一支路衰减器的第二端作为所述第一衰减单元的第二端；
所述第二衰减单元包括串联连接的第二支路衰减器和第二支路开关，其中所述第二支路衰减器的第一端作为所述第二衰减单元的第一端，所述第二支路衰减器的第二端与所述第二支路开关的第一端连接，所述第二支路开关的第二端作为所述第二衰减单元的第二端。
一种射频前端架构，包括低噪声放大器和上述衰减器电路，所述衰减器电路串接在所述低噪声放大器之前和/或放大级之后。
本申请提供的衰减器电路，包括输入节点；输出节点；第一公共衰减模块，所述第一公共衰减模块被配置为对信号进行衰减，所述第一公共衰减模块的第一端连接所述输入节点或者所述输出节点，所述第一公共衰减模块的第二端与选通衰减模块连接；选通衰减模块，包括可供选择的旁路支路和至少一个衰减支路，所述选通衰减模块与所述第一公共衰减模块串联连接。通过串联一个公共衰减模块，改变了原有衰减支路之间的连接关系，从而有效地减少了输入信号在经过任意一路径时在其他路径上产生的寄生电容，进而减少了衰减器电路所产生的寄生电容，有利于优化衰减器电路的衰减性能。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是现有的衰减器电路的示意图；
图2是本申请一实施例提供的衰减器电路的示意图；
图3是本申请另一实施例提供的衰减器电路的示意图；
图4是本申请另一实施例提供的衰减器电路的示意图；
图5是本申请另一实施例提供的衰减器电路的示意图；
图6是本申请另一实施例提供的衰减器电路的示意图；
图7是本申请另一实施例提供的衰减器电路的示意图；
图8是本申请另一实施例提供的衰减器电路的示意图
图9是本申请一实施例提供的T型衰减器的示意图；
图10是本申请一实施例提供的π型衰减器的示意图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
本申请提供了一种衰减器电路，包括输入节点；输出节点；相互串联的第一公共衰减模块和选通衰减模块，其中所述第一公共衰减模块的第一端连接所述输入节点或者所述输出节点，所述第一公共衰减模块被配置为对信号进行衰减，所述选通衰减模块包括可供选择的旁路支路和至少一个衰减支路。通过串联一个公共衰减模块，改变了原有衰减支路之间的连接关系，从而有效地减少了输入信号在经过任意一路径时在其他路径上产生的寄生电容，进而减少了衰减器电路所产生的寄生电容，有利于优化衰减器电路的衰减性能。可选地，在第一公共衰减模块中包括第一公共衰减器，该第一公共衰减器的第一端连接所述输入节点或者所述输出节点，第一公共衰减器的第二端与选通衰减模块连接。
图2为本申请一实施例提供的一种衰减器电路的示意图。所述衰减器电路可以应用于射频前端电路中，例如：可变增益放大器、低噪声放大器和功率放大器等，串接在放大器(可变增益放大器、低噪声放大器或功率放大器)之前和/或放大器之后。如图2所示，所述衰减器电路包括输入节点、输出节点；
第一公共衰减模块10，所述第一公共衰减模块10被配置为对信号进行衰减，所述第一公共衰减模块10的第一端连接所述输入节点或者所述输出节点，所述第一公共衰减模块10的第二端与选通衰减模块20连接；
选通衰减模块20，包括可供选择的旁路支路和至少一个衰减支路，所述选通衰减模块20与所述第一公共衰减模块10串联连接。
在本实施例中，所述第一公共衰减模块10与所述选通衰减模块20以串联的方式串接在所述衰减器电路的输入节点和输出节点之间。其中，当需要在输入节点改善寄生电容时，所述第一公共开关11的第一端连接所述输入节点。所述第一公共衰减模块10用于对输入信号进行一次衰减。所述选通衰减模块20包括可供用户选择的旁路支路和至少一个衰减支路。每一所述衰减支路对应一个衰减值，用于按照对应的衰减值对所述第一公共衰减模块10的输出信号进行二次衰减，从而延伸了对输入信号的多种不同衰减程度。
作为本申请的另一个优选示例，当需要在输出节点改善寄生电容时，所述第一公共开关11的第一端连接所述输出节点。所述选通衰减模块20包括可供用户选择的旁路支路和至少一个衰减支路。每一所述衰减支路对应一个衰减值，用于按照对应的衰减值对输入信号进行一次衰减；所述第一公共衰减模块10用于对所述选通衰减模块20的输出信号进行二次衰减，从而延伸了对输入信号的多种不同衰减程度。
进一步地，如图3所示，所述第一公共衰减模块10包括串联连接的第一公共开关11和第一公共衰减器12，所述第一公共开关11的第一端连接所述输入节点或者所述输出节点，所述第一公共开关11的第二端与所述第一公共衰减器12连接。
当需要在输入节点改善寄生电容时，所述第一公共开关11的第一端连接所述输入节点，所述第一公共开关11的第二端与所述第一公共衰减器12的第一端连接，所述第一公共衰减器12的第二端与所述选通衰减模块20的第一端连接，所述选通衰减模块20的第二端连接所述输出节点。所述第一公共衰减模块10用于对输入信号进行一次衰减，其对信号的衰减程度按照所述第一公共衰减器12中设定的衰减值进行。所述选通衰减模块20包括可供用户选择的旁路支路和至少一个衰减支路。每一所述衰减支路对应一个衰减值，用于按照对应的衰减值对所述第一公共衰减模块10的输出信号进行二次衰减，从而延伸了对输入信号的多种不同衰减程度。
作为本申请的另一个优选示例，当需要在输出节点改善寄生电容时，所述第一公共开关11的第一端连接所述输出节点，所述第一公共开关11的第二端与所述第一公共衰减器12的第一端连接，所述第一公共衰减器12的第二端与所述选通衰减模块20的第一端连接，所述选通衰减模块20的第二端连接所述输入节点。所述选通衰减模块20包括可供用户选择的旁路支路和至少一个衰减支路。每一所述衰减支路对应一个衰减值，用于按照对应的衰减值对输入信号进行一次衰减；所述第一公共衰减模块10用于对所述选通衰减模块20的输出信号进行二次衰减，其对信号的衰减程度按照所述第一公共衰减器12中设定的衰减值进行，从而延伸了对输入信号的多种不同衰减程度。
在本实施例中，由于第一公共衰减模块10与选通衰减模块20之间的衰减路径是串联关系，当第一公共衰减模块10与选通衰减模块20中的任意一条支路选通，用于对输入信号进行衰减时，基于电容串并联的计算方法，此时衰减器电路中其他路径上所产生的寄生电容会小于现有技术中将其它每一路径上的寄生电容直接进行并联所得到的值，从而有效地减小了在对输入信号进行衰减过程中所产生的寄生电容，进而减少了衰减器电路所产生的寄生电容，有利于优化衰减器电路的衰减性能。
作为本申请的另一个优选示例，如图4所示，在图3实施例的基础上，所述衰减器电路还包括第二公共衰减模块30，所述第二公共衰减模块30包括串联连接的第二公共开关31和第二公共衰减器32，所述第二公共开关31的第一端连接所述输出节点或者所述输入节点，所述第二公共开关31的第二端与所述第二公共衰减器32连接；所述选通衰减模块20与所述第二公共衰减模块30串联连接。
在这里，当需要同时在输入节点和在输出节点改善寄生电容时，可在图3实施例的基础上增加第二公共衰减模块30。所述第二公共衰减模块30与所述第一公共衰减模块10对应，当所述第一公共衰减模块10用于连接输入节点时，所述第二公共衰减模块30用于连接输出节点。即所述第一公共开关11的第一端连接所述输入节点，所述第二公共开关31的第一端连接所述输出节点。所述第一公共衰减模块10用于对输入信号进行一次衰减，其对信号的衰减程度按照所述第一公共衰减器12中设定的衰减值进行。所述选通衰减模块20用于按照用户选择的支路对应的衰减值对所述第一公共衰减模块10的输出信号进行二次衰减。所述第二公共衰减模块30用于对所述选通衰减模块20的输出信号进行三次衰减。
当所述第一公共衰减模块10用于连接输出节点时，所述第二公共衰减模块30用于连接输入节点。即所述第一公共开关11的第一端连接所述输出节点，所述第二公共开关31的第一端连接所述输入节点。所述第二公共衰减模块30用于对输入信号进行一次衰减，其对信号的衰减程度按照所述第二公共衰减器32中设定的衰减值进行。所述选通衰减模块20用于按照用户选择的支路对应的衰减值对所述第二公共衰减模块30的输出信号进行二次衰减。所述第一公共衰减模块10用于对所述选通衰减模块20的输出信号进行三次衰减。
在本实施例中，由于第一公共衰减模块10与选通衰减模块20之间的衰减路径是串联关系，当第一公共衰减模块10与选通衰减模块20中的一条支路用于对输入信号进行衰减时，从输入节点看，此时衰减器电路中其他衰减路径上所产生的寄生电容会小于现有技术中将其它每一路径上的寄生电容直接进行并联所得到的值；同理，由于第二公共衰减模块30与选通衰减模块20之间的衰减路径是串联关系，当第二公共衰减模块30与选通衰减模块20中的一条支路用于对输入信号进行衰减时，从输出节点看，此时衰减器电路中其他衰减路径上所产生的寄生电容会小于现有技术中将其它每一路径上的寄生电容直接进行并联所得到的值。通过本申请实施例提供的衰减器电路，有效地减小了在对输入信号进行衰减过程中所产生的寄生电容，进而减少了衰减器电路所产生的寄生电容，有利于优化衰减器电路的衰减性能。
可选地，作为本申请的一个优选示例，所述衰减器电路还可以包括一旁路路径，所述旁路路径包括一旁路开关40。所述旁路开关40的第一端与所述输入节点连接，第二端与所述输出节点连接，如图5所示。在这里，所述旁路开关40作为旁路路径的选择开关。若不需要对输入信号进行衰减时，通过将旁路路径上的所述旁路开关40闭合，输入信号直接经过旁路路径后输出。
应当理解的是，这里是在图3示例的基础上提供图5，在其他一些实施例中，也可以将旁路开关40应用在图4示例中，此处不做限制。
具体地，在图2至图5实施例的基础上提出本申请的一个优选示例，所述选通衰减模块中的旁路支路包括一旁路单元；
每一所述衰减支路包括一衰减单元和一旁路单元，所述衰减单元的第二端与所述旁路单元的第一端连接；
当所述选通衰减模块包括一个衰减支路时，所述衰减支路中的衰减单元的第一端与所述旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，所述衰减支路中的旁路单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端；
当所述选通衰减模块包括N个衰减支路时，N为大于或等于2的正整数；第一个衰减支路中的衰减单元的第一端与旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，从第二个衰减支路起，每一个衰减支路中的衰减单元的第一端连接到前一个衰减支路的衰减单元和旁路单元的连接点；所述N个衰减支路的旁路单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端。
可选地，所述旁路支路的旁路单元包括一开关，用于对所述旁路支路进行选通。所述衰减支路的旁路单元包括一开关，用于对所述衰减支路进行选通。
每一所述衰减支路的衰减单元包括串联连接的支路开关和支路衰减器；其中所述支路开关的第一端作为所述衰减单元的第一端，所述支路开关的第二端与所述支路衰减器的第一端连接，所述支路衰减器的第二端作为所述衰减单元的第二端。
为了便于理解，以下以所述选通衰减模块包括一个旁路支路和两个衰减支路为例进行说明，所述两个衰减支路分别记为第一衰减支路和第二衰减支路。如图6所示，所述选通衰减模块20包括第一开关21、第二开关22、第一支路衰减器23、第三开关24、第四开关25、第二支路衰减器26、第五开关27；
所述第一开关21的第一端与所述第二开关22的第一端之间的共接点作为所述选通衰减模块20的第一端；
所述第二开关22的第二端与所述第一支路衰减器23的第一端连接；
所述第一支路衰减器23的第二端与所述第三开关24的第一端之间的共接点与所述第四开关25的第一端连接；
所述第四开关25的第二端与所述第二支路衰减器26的第一端连接；
所述第二支路衰减器26的第二端与所述第五开关27的第一端连接；
所述第一开关21的第二端、第三开关24的第二端、第五开关27的第二端之间的共接点作为所述选通衰减模块20的输出端。
在本实施例中，所述第一支路衰减器23、第二支路衰减器26对信号的衰减值可以相同也可以不相同，此处不做限制。其中，所述第一开关21作为旁路支路的旁路单元，与第一公共衰减模块10和/或第二公共衰减模块30构成第一衰减路径。所述第二开关22、第一支路衰减器23作为第一衰减支路的衰减单元，所述第三开关24作为第一衰减支路的旁路单元，与第一公共衰减模块10和/或第二公共衰减模块30构成第二衰减路径。所述第四开关25、第二支路衰减器26作为第二衰减支路的衰减单元，所述第五开关27作为第二衰减支路的旁路单元，结合第一衰减支路的衰减单元，与第一公共衰减模块10和/或第二公共衰减模块30构成第三衰减路径。因此，可根据对信号的衰减程度需要通过闭合对应的开关，选择对应的衰减路径。
示例性地，以图6为例，假设衰减器电路，包括第一公共衰减模块10和选通衰减模块20，所述第一公共衰减器12对应的衰减值为2dB、第一支路衰减器23对应的衰减值为3dB、第二支路衰减器26对应的衰减值为4dB。若需要对输入信号进行2dB的信号衰减，则将所述第一公共开关11和旁路支路上的第一开关21闭合，其他开关断开，则输入信号将经过第一公共衰减器12进行2dB的信号衰减；此时衰减器电路所产生的寄生电容为：第五开关27对应的寄生电容与第四开关25对应的寄生电容进行串联、再与第三开关24对应的寄生电容进行并联、再与第二开关22对应的寄生电容进行串联所得到的值；可见，寄生电容小于现有技术将其它每一衰减路径上的寄生电容直接进行并联所得到的值。
若需要对输入信号进行5dB的信号衰减，则将所述第一公共开关11和第二开关22、第三开关24闭合，其他开关断开。输入信号将经过第一公共衰减器12进行2dB的信号衰减、再经过第一支路衰减器23进行3dB的信号衰减；此时衰减器电路所产生的寄生电容包括两部分：一是旁路支路上的所述第一开关31对应的寄生电容，二是第三衰减支路上的所述第四开关25对应的寄生电容与第五开关27对应的寄生电容进行串联所得到的值；可见，两部分的寄生电容均小于现有技术将其它每一衰减路径上的寄生电容直接进行并联所得到的值。
若需要对输入信号进行9dB的信号衰减，则将所述第一公共开关11和第第二开关22、第四开关25、第五开关27闭合，其他开关断开，则输入信号将经过第一公共衰减器12进行2dB的信号衰减、再经过第一支路衰减器23进行3dB的信号衰减、最后经过第二衰减器26进行4dB的信号衰减；此时衰减器电路所产生的寄生电容包括两部分：一是旁路支路上的第一开关21对应的寄生电容，二是第一衰减支路上的所述第三开关24对应的寄生电容；可见， 两部分的寄生电容均小于现有技术将其它每一衰减路径上的寄生电容直接进行并联所得到的值。
应当理解，本申请实施例在第二支路衰减器26与第五开关27之间还可以再接入第六开关，以构建下一衰减支路。具体支路的个数按实际需求设置，此处不做限制。
应当理解的是，上述图6是在图3示例的基础上提出的选通衰减模块的结构示意图，并不用于对本申请实施例进行限定。在其他一些实施例中，上述选通衰减模块也适用于图4或图5示例，此处不做限制。
具体地，在图2至图5任一实施例的基础上提出本申请的另一个优选示例，所述选通衰减模块中的旁路支路包括一旁路单元；
每一所述衰减支路包括一衰减单元和一旁路单元，所述衰减单元的第二端与所述旁路单元的第一端连接；
所述衰减支路的衰减单元的第一端与所述旁路支路的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，所述衰减支路的旁路单元的第二端与所述旁路支路的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端。
可选地，所述旁路支路的旁路单元和衰减支路的衰减单元均包括一开关。
可选地，所述衰减单元包括串联连接的支路开关和支路衰减器；
其中，所述衰减单元中的所述支路开关的第一端作为所述衰减单元的第一端，所述支路开关的第二端与所述支路衰减器的第一端连接，所述支路衰减器的第二端作为所述衰减单元的第二端。
为了便于理解，以下以所述选通衰减模块包括一个旁路支路和两个衰减支路为例进行说明，所述两个衰减支路分别记为第一衰减支路和第二衰减支路。如图7所示，所述选通衰减模块20包括第一开关21、第二开关22、第一支路衰减器23、第三开关24、第四开关25、第二支路衰减器26、第五开关27。
所述第一开关21的第一端与所述第二开关22的第一端、第四开关25的第一端之间的共接点作为所述选通衰减模块20的第一端；
所述第二开关22的第二端与所述第一支路衰减器23的第一端连接；
所述第一支路衰减器23的第二端与所述第三开关24的第一端连接；
所述第四开关25的第二端与所述第二支路衰减器26的第一端连接；
所述第二支路衰减器26的第二端与所述第五开关27的第一端连接；
所述第一开关21的第二端、第三开关24的第二端、第五开关27的第二端之间的共接点作为所述选通衰减模块20的输出端。
在这里，所述第一支路衰减器22、第二支路衰减器26对信号的衰减值可以相同也可以不相同，此处不做限制。其中，所述第一开关21作为旁路支路的旁路单元，与第一公共衰减模块10和/或第二公共衰减模块30构成第一衰减路径。所述第二开关22、第一支路衰减器23作为第一衰减支路的衰减单元，所述第三开关24作为第一衰减支路的旁路单元，与第一公共衰减模块10和/或第二公共衰减模块30构成第二衰减路径。所述第五开关25、第二支路衰减器26作为第二衰减支路的衰减单元，所述第五开关27作为第二衰减支路的旁路单元，与第一公共衰减模块10和/或第二公共衰减模块30构成第三衰减路径。用户可根据对信号的衰减程度通过闭合开关，选择对应的衰减路径。
示例性地，以图7为例，假设衰减器电路，包括第一公共衰减模块10和选通衰减模块20，假设所述第一公共衰减器12对应的衰减值为3dB、第一支路衰减器23对应的衰减值为6dB、第二支路衰减器26对应的衰减值为12dB。若需要对输入信号进行3dB的信号衰减，则将所述第一公共开关11和第一开关21闭合，其他开关断开，则输入信号将经过第一公共衰减器12进行3dB的信号衰减；此时衰减器电路所产生的寄生电容为：第四开关25对应的寄生电容与第五开关27对应的寄生电容进行串联、第二开关22的寄生电容与第三开关24的寄生电容进行串联，再将两部分串联值与旁路支路上的第一开关21对应的寄生电容进行并联所得到的值；可见，寄生电容会小于现有技术将其它每一衰减路径上的寄生电容直接进行并联所得到的值。
若需要对输入信号进行9dB的信号衰减，则将所述第一公共开关11和第二开关22、第三开关24闭合，其他开关断开，则输入信号将经过第一公共衰减器12进行3dB的信号衰减、再经过第二支路衰减器13进行6dB的信号衰减；此时衰减器电路所产生的寄生电容包括两部分：一是旁路支路的所述第一开关21对应的寄生电容，二是第二衰减支路上的所述第四开关25对应的寄生电容与第五开关27对应的寄生电容进行串联所得到的值；可见，两部分的寄生电容均小于现有技术将其它每一衰减路径上的寄生电容直接进行并联所得到的值。
若需要对输入信号进行15dB的信号衰减，则将所述一公共开关12、第四开关25和第五开关27闭合，其他开关断开，则输入信号将经过第一公共衰减器22进行3dB的信号衰减、再经过第二支路衰减器26进行12dB的信号衰减；此时衰减器电路所产生的寄生电容为：第一衰减支路上的所述第二开关22和第三开关24对应的寄生电容进行串联所得到的值，再与旁路支路上的第一开关21进行并联所得到的值；可见，寄生电容均小于现有技术将其它每一衰减路径上的寄生电容直接进行并联所得到的值。
应当理解的是，上述图7是在图3示例的基础上提出的选通衰减模块的结构示意图，并不用于对本申请实施例进行限定。在其他一些实施例中，上述选通衰减模块也适用于图4或图5示例，此处不做限制。
具体地，在图2至图5任一实施例的基础上提出本申请的另一个优选示例，所述选通衰减模块中的旁路支路包括一旁路单元；
当所述选通衰减模块包括一个衰减支路时，所述衰减支路包括第一衰减单元、旁路单元，所述第一衰减单元的第二端与所述旁路单元的第一端连接；所述第一衰减单元的第一端与所述旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，所述衰减支路中的旁路单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端；
当所述选通衰减模块包括N个衰减支路时，N为大于或等于2的正整数；第n(n＝1，2，3……，N-1)个衰减支路包括第一衰减单元、旁路单元、第二衰减单元，所述第一衰减单元的第二端与所述旁路单元的第一端连接，所述旁路单元的第二端与所述第二衰减单元的第一端连接；第一个衰减支路中的第一衰减单元的第一端与所述旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，第一个衰减支路中的第二衰减单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端；从第二个衰减支路起，每一个衰减支路中的第一衰减单元的第一端连接到前一个衰减支路的第一衰减单元和旁路单元的连接点，每一个衰减支路中的第二衰减单元的第二端连接到前一个衰减支路的旁路单元和第二衰减单元的连接点；
第N个衰减支路包括第一衰减单元和旁路单元，所述第一衰减单元的第二端与所述旁路单元的第一端连接；所述第N个衰减支路的第一衰减单元的第一端连接到前一个衰减支路的第一衰减单元和旁路单元的连接点，所述第N个衰减支路的旁路单元的第二端连接到前一个衰减支路的旁路单元与第二衰减单元的连接点。
可选地，所述旁路支路的旁路单元和衰减支路的旁路单元均包括一开关。
可选地，所述第一衰减单元包括串联连接的第一支路开关和第一支路衰减器，其中所述第一支路开关的第一端作为所述第一衰减单元的第一端，所述第一支路开关的第二端与所述第一支路衰减器的第一端连接，所述第一支路衰减器的第二端作为所述第一衰减单元的第二端；
所述第二衰减单元包括串联连接的第二支路衰减器和第二支路开关，其中所述第二衰减器的第一端作为所述第二支路衰减单元的第一端，所述第二支路衰减器的第二端与所述第二支路开关的第一端连接，所述第二支路开关的第二端作为所述第二衰减单元的第二端。
为了便于理解，以下以所述选通衰减模块包括一个旁路支路和两个衰减支路为例进行说明，所述衰减支路分别记为第一衰减支路和第二衰减支路。如图8所示，所述选通衰减模块20包括第一开关21、第二开关22、第一支路衰减器23、第三开关24、第二支路衰减器25、第四开关26、第五开关27、第三支路衰减器28、第六开关29；
所述第一开关21的第一端与所述第二开关22的第一端之间的共接点作为所述选通衰减模块20的第一端；
所述第二开关22的第二端与所述第一支路衰减器23的第一端连接；
所述第一支路衰减器23的第二端与所述第三开关24的第一端之间的共接点连接所述第五开关27；
所述第五开关27的第二端与所述第三支路衰减器28的第一端连接；
所述第三支路衰减器28的第二端与所述第六开关29的第一端连接；
所述第六开关29的第二端与所述第三开关24的第二端之间的共接点连接所述第二支路衰减器25的第一端；
所述第二支路衰减器25的第二端与所述第四开关26的第一端连接；
所述第四开关26的第二端与所述第一开关21的第二端之间的共接点作为所述选通衰减模块20的第二端。
在本实施例中，所述第一支路衰减器23、第二支路衰减器25、第三支路衰减器28对信号的衰减值可以相同也可以不相同，此处不做限制。其中，所述第一开关21作为旁路支路的旁路单元，与第一公共衰减模块10和/或第二公共衰减模块30构成第一衰减路径。所述第二开关22、第一支路衰减器23作为第一衰减支路的第一衰减单元，所述第三开关24作为第一衰减支路的旁路单元，所述第二支路衰减器25、第四开关26作为第一衰减支路的第二衰减单元，与第一公共衰减模块10和/或第二公共衰减模块30构成第二衰减路径。所述第五开关27、第三支路衰减器28作为第二衰减支路的第一衰减单元，所述第六开关29作为第二衰减支路的旁路单元，结合所述第一衰减支路的第一衰减单元、第二衰减单元，与第一公共衰减模块10和/或第二公共衰减模块30构成第三衰减路径。用户可根据对信号的衰减程度通过闭合开关，选择对应的衰减路径。
应当理解的是，上述图8是在图3示例的基础上提出的选通衰减模块的结构示意图，并不用于对本申请实施例进行限定。在其他一些实施例中，上述选通衰减模块也适用于图4或图5示例，此处不做限制。
可选地，所述公共衰减器和支路衰减器均为电阻元件组成的二端口网络，阻抗、衰减量都是与频率无关的常数，相移等于零。可选地，所述公共衰减器和支路衰减器包括但不限于T型衰减器或者π型衰减器。
可选地，如图9所示，为本实施例提供的T型衰减器的结构示意图。在图7中，所述T型衰减器包括第一电阻R11、第二电阻R12、第三电阻R13，其中所述第一电阻R11、第二电阻R12、第三电阻R13的一端共接，所述第一电阻R11的另一端作为输入端，所述第三电阻R13的另一端作为输出端。
可选地，如图10所示，为本实施例提供的π型衰减器的结构示意图。在图8中，所述π型衰减器包括第一电阻R21、第二电阻R22、第三电阻R23，其中所述第一电阻R21和第二电阻R22的共接点作为输入端，所述第一电阻R21和第三电阻R23的共接点作为输出端。
综上所述，本申请实施例提供的衰减器电路，可有效地减小在对输入信号进行衰减过程中所产生的寄生电容，进而减少了衰减器电路所产生的寄生电容，有利于优化射频前端架构的衰减性能。
本申请实施例还提供了一种射频前端架构，所述射频前端架构包括低噪声放大器和如上所述的衰减器电路，所述衰减器电路串接在所述低噪声放大器之前和/或放大级之后。由于所述衰减器电路的寄生电容较小，衰减性能相对现有技术得到提升，从而使得所述射频前端架构的衰减性能得到较大的优化。
以上所述实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围，均应包含在本申请的保护范围之内。

Claims (14)

  1. 一种衰减器电路，其中，包括：
    输入节点；
    输出节点；
    第一公共衰减模块，所述第一公共衰减模块被配置为对信号进行衰减，所述第一公共衰减模块的第一端连接所述输入节点或者所述输出节点，所述第一公共衰减模块的第二端与选通衰减模块连接；
    选通衰减模块，包括可供选择的旁路支路和至少一个衰减支路，所述选通衰减模块与所述第一公共衰减模块串联连接。
  2. 如权利要求1所述的衰减器电路，其中，所述第一公共衰减模块包括串联连接的第一公共开关和第一公共衰减器，所述第一公共开关的第一端连接所述输入节点或者所述输出节点，所述第一公共开关的第二端与所述第一公共衰减器连接。
  3. 如权利要求2所述的衰减器电路，其中，还包括第二公共衰减模块，所述第二公共衰减模块包括串联连接的第二公共开关和第二公共衰减器，所述第二公共开关的第一端连接所述输出节点或者所述输入节点，所述第二公共开关的第二端与所述第二公共衰减器连接；
    所述选通衰减模块与所述第二公共衰减模块串联连接。
  4. 如权利要求2或3所述的衰减器电路，其中，还包括旁路开关，所述旁路开关的第一端与所述输入节点连接，第二端与所述输出节点连接。
  5. 如权利要求1-3任一项所述的衰减器电路，其中，所述选通衰减模块中的旁路支路包括一旁路单元；
    每一所述衰减支路包括一衰减单元和一旁路单元，所述衰减单元的第二端与所述旁路单元的第一端连接；
    当所述选通衰减模块包括一个衰减支路时，所述衰减支路中的衰减单元的第一端与所述旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，所述衰减支路中的旁路单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端；
    当所述选通衰减模块包括N个衰减支路时，N为大于或等于2的正整数，第一个衰减支路中的衰减单元的第一端与旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，从第二个衰减支路起，每一个衰减支路中的衰减单元的第一端连接到前 一个衰减支路的衰减单元和旁路单元的连接点；所述N个衰减支路的旁路单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端。
  6. 如权利要求5所述的衰减器电路，其中，所述旁路支路的旁路单元和所述衰减支路的旁路单元均包括一开关。
  7. 如权利要求5所述的衰减器电路，其中，每一所述衰减支路的衰减单元包括串联连接的支路开关和支路衰减器；
    所述支路开关的第一端作为所述衰减单元的第一端，所述支路开关的第二端与所述支路衰减器的第一端连接，所述支路衰减器的第二端作为所述衰减单元的第二端。
  8. 如权利要求1-3任一项所述的衰减器电路，其中，所述选通衰减模块中的旁路支路包括一旁路单元；
    每一所述衰减支路包括一衰减单元和一旁路单元，其中，所述衰减单元的第二端与所述衰减支路的旁路单元的第一端连接；
    所述衰减支路的衰减单元的第一端与所述旁路支路的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，所述衰减支路的旁路单元的第二端与所述旁路支路的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端。
  9. 如权利要求8所述的衰减器电路，其中，所述旁路支路的旁路单元和衰减支路的衰减单元均包括一开关。
  10. 如权利要求8所述的衰减器电路，其中，所述衰减单元包括串联连接的支路开关和支路衰减器；
    所述支路开关的第一端作为所述衰减单元的第一端，所述支路开关的第二端与所述支路衰减器的第一端连接，所述支路衰减器的第二端作为所述衰减单元的第二端。
  11. 如权利要求1-3任一项所述的衰减器电路，其中，所述选通衰减模块中的旁路支路包括一旁路单元；
    当所述选通衰减模块包括一个衰减支路时，所述衰减支路包括第一衰减单元、旁路单元，所述第一衰减单元的第二端与所述旁路单元的第一端连接；所述第一衰减单元的第一端与所述旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，所述衰减支路中的旁路单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端；
    当所述选通衰减模块包括N个衰减支路时，N为大于或等于2的正整数，第n个衰减支路包括第一衰减单元、旁路单元、第二衰减单元，其中，n＝1，2，3……，N-1)，所述第一衰减单元的第二端与所述旁路单元的第一端连接，所述旁路单元的第二端与所述第二衰减 单元的第一端连接；第一个衰减支路中的第一衰减单元的第一端与所述旁路支路中的旁路单元的第一端之间的共接点作为所述选通衰减模块的第一端，第一个衰减支路中的第二衰减单元的第二端与所述旁路支路中的旁路单元的第二端之间的共接点作为所述选通衰减模块的第二端；从第二个衰减支路起，每一个衰减支路中的第一衰减单元的第一端连接到前一个衰减支路的第一衰减单元和旁路单元的连接点，每一个衰减支路中的第二衰减单元的第二端连接到前一个衰减支路的旁路单元和第二衰减单元的连接点；
    第N个衰减支路包括第一衰减单元和旁路单元，所述第一衰减单元的第二端与所述旁路单元的第一端连接；所述第N个衰减支路的第一衰减单元的第一端连接到前一个衰减支路的第一衰减单元和旁路单元的连接点，所述第N个衰减支路的旁路单元的第二端连接到前一个衰减支路的旁路单元与第二衰减单元的连接点。
  12. 如权利要求11所述的衰减器电路，其中，所述旁路支路的旁路单元和衰减支路的旁路单元均包括一开关。
  13. 如权利要求11所述的衰减器电路，其中，所述第一衰减单元包括串联连接的第一支路开关和第一支路衰减器，其中所述第一支路开关的第一端作为所述第一衰减单元的第一端，所述第一支路开关的第二端与所述第一支路衰减器的第一端连接，所述第一支路衰减器的第二端作为所述第一衰减单元的第二端；
    所述第二衰减单元包括串联连接的第二支路衰减器和第二支路开关，其中所述第二支路衰减器的第一端作为所述第二衰减单元的第一端，所述第二支路衰减器的第二端与所述第二支路开关的第一端连接，所述第二支路开关的第二端作为所述第二衰减单元的第二端。
  14. 一种射频前端架构，其中，包括低噪声放大器和如权利要求1至13任一项所述的衰减器电路，所述衰减器电路串接在所述低噪声放大器之前和/或放大级之后。
PCT/CN2021/111067 2020-08-13 2021-08-06 一种衰减器电路及射频前端架构 WO2022033392A1 (zh)

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