CN111293983B - High-linearity active mixer with common mode feedback - Google Patents
High-linearity active mixer with common mode feedback Download PDFInfo
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- CN111293983B CN111293983B CN202010047406.0A CN202010047406A CN111293983B CN 111293983 B CN111293983 B CN 111293983B CN 202010047406 A CN202010047406 A CN 202010047406A CN 111293983 B CN111293983 B CN 111293983B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/14—Balanced arrangements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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Abstract
The invention discloses a high linearity active mixer with common mode feedback, which comprises a voltage-current conversion unit, a radio frequency intermediate frequency conversion unit, a first current source, a second current source, a transimpedance amplifier and a common mode feedback unit, wherein the input end of the voltage-current conversion unit inputs a radio frequency voltage signal, and the output end of the voltage-current conversion unit is connected with the input end of the radio frequency intermediate frequency conversion unit; the differential output end of the radio frequency intermediate frequency conversion unit is respectively connected with the drain end of the first current source and the drain end of the second current source, and is simultaneously connected with the input end of the transimpedance amplifier and the input end of the common mode feedback unit; the output end of the common mode feedback unit is connected with the output end of the voltage-current conversion unit; the output end of the transimpedance amplifier outputs a voltage output signal. The output common-mode voltage is not affected by the process angle and the temperature, the output voltage swing is not limited, and the linearity is good.
Description
Technical Field
The invention relates to the field of radio frequency integrated circuit design, in particular to a circuit structure for improving linearity of an active mixer.
Background
Active mixers are commonly used in communication transceiver systems, where linearity directly determines the anti-interference capability of the receiver front-end. The conventional active mixer adopts a Gilbert multiplier structure, as shown in FIG. 1, the transistors M1 and M2 apply the input voltage signal V RF Converts into current, plays a role of transconductance, and the transistors M3, M4, M5 and M6 are used as variable frequency transistors, and the grid input signal is V LO Converting the radio frequency current signal into an intermediate frequency current signal, and enabling the intermediate frequency current signal to flow through resistors R1 and R2 to generate an output voltage signal V IF . Since the transistors M1 and M3 occupy a certain voltage margin due to the stacked multilayer transistors, the output swing is limited and the linearity is severely affected. In addition, the output common mode level of conventional active mixers varies with process angle and temperature, further deteriorating the linearity of the active mixer.
Disclosure of Invention
The invention aims to: in order to solve the problem of poor linearity of an active mixer in the prior art, the invention provides a high-linearity active mixer with common mode feedback.
The technical scheme is as follows: the high linearity active mixer with common mode feedback comprises a voltage-current conversion unit, a radio frequency intermediate frequency conversion unit, a first current source, a second current source, a transimpedance amplifier and a common mode feedback unit, wherein the input end of the voltage-current conversion unit inputs a radio frequency voltage signal, and the output end of the voltage-current conversion unit is connected with the input end of the radio frequency intermediate frequency conversion unit; the differential output end of the radio frequency intermediate frequency conversion unit is respectively connected with the drain end of the first current source and the drain end of the second current source, the differential output end of the radio frequency intermediate frequency conversion unit is connected with the input end of the transimpedance amplifier, and the differential output end of the radio frequency intermediate frequency conversion unit is connected with the input end of the common mode feedback unit; the output end of the common mode feedback unit is connected with the output end of the voltage-current conversion unit; the output end of the transimpedance amplifier outputs a voltage output signal.
Further, the common mode feedback unit includes a voltage amplifier, a seventh transistor M7, and an eighth transistor M8, the drain terminal of the first current source and the drain terminal of the second current source are connected to two positive input terminals of the voltage amplifier, the negative input terminal of the voltage amplifier inputs a common mode reference level, the output terminal of the voltage amplifier is connected to the input terminals of the seventh transistor M7 and the eighth transistor M8, the output terminals of the seventh transistor M7 and the eighth transistor M8 are connected to the output terminal of the voltage-current conversion unit, and the common terminal of the seventh transistor M7 and the eighth transistor M8 is connected to a power supply.
Further, the seventh transistor M7 and the eighth transistor M8 are PMOS transistors, the input ends of the seventh transistor M7 and the eighth transistor M8 are gates, the output ends are drains, and the common end is a source.
Further, the seventh transistor M7 and the eighth transistor M8 are PNP transistors, the input ends of the seventh transistor M7 and the eighth transistor M8 are bases, the output ends are collectors, and the common end is an emitter.
Further, the voltage-current conversion unit includes a first transistor M1 and a second transistor M2, the radio frequency voltage signal is input from the input ends of the first transistor M1 and the second transistor M2, the output ends of the first transistor M1 and the second transistor M2 are the output ends of the voltage-current conversion unit, and the common ground of the first transistor M1 and the second transistor M2 is grounded.
Further, the first transistor M1 and the second transistor M2 are NMOS transistors, the input ends of the first transistor M1 and the second transistor M2 are gates, the output ends are drains, and the common end is a source.
Further, the first transistor M1 and the second transistor M2 are NPN transistors, the input ends of the first transistor M1 and the second transistor M2 are bases, the output ends are collectors, and the common end is an emitter.
Further, the rf intermediate frequency conversion unit includes a third transistor M3, a fourth transistor M4, a fifth transistor M5, and a sixth transistor M6, where sources of the third transistor M3, the fourth transistor M4, the fifth transistor M5, and the sixth transistor M6 are differential input ends of the rf intermediate frequency conversion unit; drains of the third transistor M3 and the fifth transistor M5 and drains of the fourth transistor M4 and the sixth transistor M6 are differential output ends of the radio frequency intermediate frequency conversion unit; the gates of the third transistor M3, the sixth transistor M6, and the gates of the fourth transistor M4, the fifth transistor M5 input gate voltages.
Further, the third transistor M3, the fourth transistor M4, the fifth transistor M5, and the sixth transistor M6 are NMOS transistors or NPN transistors.
The beneficial effects are that: compared with the prior art, the invention provides the high-linearity active mixer with common mode feedback, the output common mode voltage is not influenced by process angles and temperature, the output voltage swing of the active mixer is not generated at the drain ends of two current sources, but flows into the transimpedance amplifier in the form of signal current at the drain ends of the two current sources, and voltage signal output is generated at the output end of the transimpedance amplifier so as to generate voltage swing, and the defect that the output swing of the traditional active mixer is limited is overcome. The high-power active frequency mixer has strong practicability in a radio frequency circuit, simple structure and unlimited output swing, thereby improving the linearity of the active frequency mixer and being widely applied to radio frequency transceiver chips.
Drawings
FIG. 1 is a schematic diagram of a conventional active mixer employing a Gilbert multiplier configuration;
fig. 2 is a schematic diagram of a high linearity active mixer with common mode feedback of the present invention.
Detailed Description
The invention is further illustrated by the following description in conjunction with the accompanying drawings and specific embodiments.
As shown in FIG. 2, the high linearity active mixer with common mode feedback comprises a voltage-current conversion unit, a radio frequency intermediate frequency conversion unit,The input end of the voltage-current conversion unit inputs a radio frequency voltage signal V RF The output end is connected with the input end of the radio frequency intermediate frequency conversion unit; the differential output end of the radio frequency intermediate frequency conversion unit is respectively connected with the drain end of the first current source I1 and the drain end of the second current source I2, and is simultaneously connected with the input end of the transimpedance amplifier TIA and the input end of the common mode feedback unit; the output end of the common mode feedback unit is connected with the output end of the voltage-current conversion unit; the output end of the transimpedance amplifier TIA outputs a voltage output signal V IF 。
The common mode feedback unit comprises a voltage amplifier AMP, a seventh transistor M7 and an eighth transistor M8, wherein the drain end of the first current source I1 and the drain end of the second current source I2 are connected with two positive input ends of the voltage amplifier AMP, the negative input end of the voltage amplifier AMP inputs a common mode reference level VCM, the output end of the voltage amplifier AMP is connected with the input ends of the seventh transistor M7 and the eighth transistor M8, the output ends of the seventh transistor M7 and the eighth transistor M8 are connected with the output end of the voltage-current conversion unit, and the common end of the seventh transistor M7 and the eighth transistor M8 is connected with a power supply.
The voltage-current conversion unit comprises a first transistor M1 and a second transistor M2, radio frequency voltage signals are input from input ends of the first transistor M1 and the second transistor M2, output ends of the first transistor M1 and the second transistor M2 are output ends of the voltage-current conversion unit, and a common ground of the first transistor M1 and the second transistor M2 is grounded.
The radio frequency intermediate frequency conversion unit comprises a third transistor M3, a fourth transistor M4, a fifth transistor M5 and a sixth transistor M6, wherein the sources of the third transistor M3 and the fourth transistor M4 and the sources of the fifth transistor M5 and the sixth transistor M6 are differential input ends of the radio frequency intermediate frequency conversion unit; drains of the third transistor M3 and the fifth transistor M5 and drains of the fourth transistor M4 and the sixth transistor M6 are differential output ends of the radio frequency intermediate frequency conversion unit; the gates of the third transistor M3, the sixth transistor M6, and the gates of the fourth transistor M4, the fifth transistor M5 input gate voltages.
In this embodiment, the first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4, the fifth transistor M5, and the sixth transistor M6 are NMOS transistors, the input terminal is a gate, the output terminal is a drain, and the common terminal is a source. An NPN triode can also be adopted, wherein the input end of the NPN triode is a base electrode, the output end of the NPN triode is a collector electrode, and the common end of the NPN triode is an emitter electrode.
In this embodiment, the seventh transistor M7 and the eighth transistor M8 are PMOS transistors, the input terminal is a gate, the output terminal is a drain, and the common terminal is a source. PNP transistors may also be used, in which the input terminal is the base, the output terminal is the collector, and the common terminal is the emitter.
Input of a radio frequency voltage signal V RF Conversion to a radio frequency current signal I via transconductance transistors M1 and M2 RF Radio frequency current signal I RF Through the variable frequency transistors M3, M4, M5 and M6, the grid voltage signal is input into the grid of the variable frequency transistor to be V LO Generates intermediate frequency current I IF ＝GM*V RF GM is the frequency conversion transconductance, the drain terminal A of the first current source I1 is connected with the first input terminal C of the transimpedance amplifier TIA, the drain terminal B of the second current source I2 is connected with the second input terminal D of the transimpedance amplifier TIA, and because the input of the transimpedance amplifier is low-resistance, the alternating current signal I IF All flows into the transimpedance amplifier and generates a voltage signal output V at the output end of the transimpedance amplifier IF ＝I IF * R and R are resistance values of an input end and an output end of the transimpedance amplifier, and as voltage amplification is not generated at points A and B in the invention, the defect of limited output amplitude of the traditional active mixer is overcome.
In addition, the drain ends A and B of the current source are connected with two positive input ends of the voltage amplifier AMP, the negative input ends of the current source are connected with a common mode reference level VCM, the output ends of the voltage amplifier are connected to a seventh transistor M7 and an eighth transistor M8, the drain ends of the seventh transistor M7 and the eighth transistor M8 are respectively connected with the drain ends of the first transistor M1 and the second transistor M2 to form a common mode feedback loop, when the gain of the voltage amplifier AMP is large enough, the positive end and the negative end of the input of the voltage amplifier can form virtual short, namely, the voltage of VCM=2× (VA+VB) is met, and the voltage of the point A and the voltage of the point B are respectively, so that the common mode voltage is stably output, the defect that the output common mode voltage of the traditional active mixer changes along with the change of a process angle and the temperature is overcome, and the linearity of the active mixer is further improved.
Claims (6)
1. The high linearity active mixer with common mode feedback is characterized by comprising a voltage-current conversion unit, a radio frequency intermediate frequency conversion unit, a first current source, a second current source, a transimpedance amplifier and a common mode feedback unit, wherein the input end of the voltage-current conversion unit inputs a radio frequency voltage signal, and the output end of the voltage-current conversion unit is connected with the input end of the radio frequency intermediate frequency conversion unit; the differential output end of the radio frequency intermediate frequency conversion unit is respectively connected with the drain end of the first current source and the drain end of the second current source, the differential output end of the radio frequency intermediate frequency conversion unit is connected with the input end of the transimpedance amplifier, and the differential output end of the radio frequency intermediate frequency conversion unit is connected with the input end of the common mode feedback unit; the output end of the common mode feedback unit is connected with the output end of the voltage-current conversion unit, the common mode feedback unit comprises a voltage amplifier, a seventh transistor M7 and an eighth transistor M8, the drain end of the first current source and the drain end of the second current source are connected with two positive input ends of the voltage amplifier, the negative input end of the voltage amplifier inputs a common mode reference level, the output end of the voltage amplifier is connected with the input ends of the seventh transistor M7 and the eighth transistor M8, the output ends of the seventh transistor M7 and the eighth transistor M8 are connected with the output end of the voltage-current conversion unit, and the common end of the seventh transistor M7 and the eighth transistor M8 is connected with a power supply to form a common mode feedback loop; the output end of the transimpedance amplifier outputs a voltage output signal; the voltage-current conversion unit comprises a first transistor M1 and a second transistor M2, radio frequency voltage signals are input from input ends of the first transistor M1 and the second transistor M2, output ends of the first transistor M1 and the second transistor M2 are output ends of the voltage-current conversion unit, and a common ground of the first transistor M1 and the second transistor M2 is grounded; the radio frequency intermediate frequency conversion unit comprises a third transistor M3, a fourth transistor M4, a fifth transistor M5 and a sixth transistor M6, wherein the sources of the third transistor M3 and the fourth transistor M4 and the sources of the fifth transistor M5 and the sixth transistor M6 are differential input ends of the radio frequency intermediate frequency conversion unit; drains of the third transistor M3 and the fifth transistor M5 and drains of the fourth transistor M4 and the sixth transistor M6 are differential output ends of the radio frequency intermediate frequency conversion unit; the gates of the third transistor M3, the sixth transistor M6, and the gates of the fourth transistor M4, the fifth transistor M5 input gate voltages.
2. The high linearity active mixer with common mode feedback of claim 1, wherein said seventh transistor M7, eighth transistor M8 is a PMOS transistor, the input terminal of the seventh transistor M7, eighth transistor M8 is a gate, the output terminal is a drain, and the common terminal is a source.
3. The high linearity active mixer with common mode feedback of claim 1, wherein said seventh transistor M7, eighth transistor M8 is a PNP transistor, the input terminal of the seventh transistor M7, eighth transistor M8 is a base, the output terminal is a collector, and the common terminal is an emitter.
4. A high linearity active mixer with common mode feedback according to any of claims 1 to 3, wherein said first transistor M1, second transistor M2 are NMOS transistors, the input terminal of the first transistor M1, second transistor M2 is a gate, the output terminal is a drain, and the common terminal is a source.
5. A high linearity active mixer with common mode feedback according to any of claims 1 to 3, wherein said first transistor M1, second transistor M2 are NPN transistors, the input terminal of the first transistor M1, second transistor M2 is a base, the output terminal is a collector, and the common terminal is an emitter.
6. A high linearity active mixer with common mode feedback according to any of claims 1 to 3, wherein said third transistor M3, fourth transistor M4, fifth transistor M5, sixth transistor M6 is an NMOS transistor or an NPN transistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010047406.0A CN111293983B (en) | 2020-01-15 | 2020-01-15 | High-linearity active mixer with common mode feedback |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010047406.0A CN111293983B (en) | 2020-01-15 | 2020-01-15 | High-linearity active mixer with common mode feedback |
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| CN111293983A CN111293983A (en) | 2020-06-16 |
| CN111293983B true CN111293983B (en) | 2023-09-12 |
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| CN112564639B (en) * | 2020-12-02 | 2024-06-07 | 广东美的白色家电技术创新中心有限公司 | Electrical equipment, electronic device and differential amplifying circuit thereof |
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| CN1894848A (en) * | 2004-01-22 | 2007-01-10 | 诺基亚公司 | Mixer circuit |
| CN103384139A (en) * | 2012-05-02 | 2013-11-06 | 中国科学院微电子研究所 | Voltage-biased mixer circuit |
| CN104242823A (en) * | 2013-06-08 | 2014-12-24 | 锐迪科微电子科技（上海）有限公司 | Mixing switching circuit and mixer |
| CN104935260A (en) * | 2015-06-03 | 2015-09-23 | 西安电子科技大学 | High-gain low-noise frequency mixer |
| CN105897172A (en) * | 2016-04-20 | 2016-08-24 | 佛山臻智微芯科技有限公司 | Linearity improved mixer |
| US10075174B1 (en) * | 2017-06-22 | 2018-09-11 | Globalfoundries Inc. | Phase rotator apparatus |
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2020
- 2020-01-15 CN CN202010047406.0A patent/CN111293983B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1894848A (en) * | 2004-01-22 | 2007-01-10 | 诺基亚公司 | Mixer circuit |
| CN103384139A (en) * | 2012-05-02 | 2013-11-06 | 中国科学院微电子研究所 | Voltage-biased mixer circuit |
| CN104242823A (en) * | 2013-06-08 | 2014-12-24 | 锐迪科微电子科技（上海）有限公司 | Mixing switching circuit and mixer |
| CN104935260A (en) * | 2015-06-03 | 2015-09-23 | 西安电子科技大学 | High-gain low-noise frequency mixer |
| CN105897172A (en) * | 2016-04-20 | 2016-08-24 | 佛山臻智微芯科技有限公司 | Linearity improved mixer |
| US10075174B1 (en) * | 2017-06-22 | 2018-09-11 | Globalfoundries Inc. | Phase rotator apparatus |
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