CN103248328B - Power amplifier and utilization method - Google Patents
Power amplifier and utilization method Download PDFInfo
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- CN103248328B CN103248328B CN201310179930.3A CN201310179930A CN103248328B CN 103248328 B CN103248328 B CN 103248328B CN 201310179930 A CN201310179930 A CN 201310179930A CN 103248328 B CN103248328 B CN 103248328B
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Abstract
An embodiment of the invention discloses a power amplifier and a utilization method. The power amplifier comprises a power amplifying circuit and a control loop; the control loop comprises at least three input terminals, a power control output terminal, a preset reference voltage and a voltage signal which is used for showing the power; the power control output terminal, the preset reference voltage and the voltage signal are respectively connected with a digital to an analog converter; an output terminal of the control loop is connected with a pre-pushing amplifying pipe grid and a pushing level amplifying pipe grid of the power amplifying circuit; a voltage of the power control output terminal of the digital to the analog converter, the preset reference voltage and corresponding voltage of the voltage signal which is used for showing the power are compared through the control loop; the voltage is output in the output terminal of the control loop after the integrating with the voltage of the power control output terminal of the digital to the analog converter; and the voltage which is output in the output terminal of the control loop is used for controlling a bias voltage of the pre-pushing amplifying pipe grid and a pushing level amplifying pipe grid of the power amplifying circuit. According to the power amplifier and the utilization method, the cost is low and the power controlled dynamic range is large.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of power amplifier and application method.
Background technology
Current digital mobile radio communication（Digital mobile radio, DMR）Vehicle mounted station, its Power Control dynamic model
Generally 10~16Db is enclosed, for example：, up to 45W, minimum emissive power is up to 5W, the dynamic model of Power Control for maximum transmission power
Enclose up to 10dB.The DMR Vehicle mounted stations of also following classification, peak power output is 40W, and minimum output power is 1W, dynamic model
It is 16dB to enclose.
Current Hytera（BESTA）Digital in-vehicle platform, when transmission power is less than minimum emissive power, power rise
Time can lengthen rapidly, beyond the setting of 1.5ms.In addition, in low temperature, transmission power can also decline rapidly.In order to solve
Above mentioned problem, can be solved by increasing the dynamic range of Power Control, the scheme one of the dynamic range of current Power Control
As have the following two kinds：
First, forward emitting power is sampled by directional coupler, using logafier by forward power be converted to
Its linear voltage controls power amplifier（Power amplifier, PA）The grid voltage of level is promoted, so as to control
The power output of PA processed.It is general in the program to use such as AD8315（A kind of radio frequency detector and control integrated circuit）Logarithm put
Big device, its main advantage is have dynamic range very wide（Up to 50dB, actually used Power control dynamic range is
2050dB）, power output is linear with input power control voltage, is internally integrated integrator, can flexible control ring
The dynamic range on road.
The program can flexibly control the dynamic range and sequential of power control loop, but AD8315 prices are higher,
Circuit is complicated, and high/low temperature needs more temperature-compensation circuit, and software design patterns are more complicated；Therefore program cost of implementation is high.
2nd, forward emitting power is sampled by directional coupler, the voltage and digital analog converter detected using detection tube
（Digital to Analog Converter, DAC）The affected signed magnitude arithmetic(al) of power control voltage of output controls PA to promote
The grid voltage of level, so as to control the power output of PA.
Program hardware and software cost is very low, but the dynamic range of Power Control is relatively low.
Based on described above, there is provided with low cost easy to spread, and the dynamic range and accuracy of Power Control are preferable
Power amplifier turn into the more urgent demand of industry.
The content of the invention
A kind of method for improving Power control dynamic range is the embodiment of the invention provides, it is a kind of with low cost for providing
It is easy to spread, and Power Control the preferable power amplifier of dynamic range and accuracy.
A kind of power amplifier, including：Power amplification circuit, also includes：Control loop；
The control loop includes at least three inputs, and the power control output of digital analog converter, pre- is connected respectively
If the voltage signal of reference voltage and expression power；
The pre- promotion that the output end of the control loop connects the power amplification circuit is amplified tube grid and promotes level to put
Big tube grid；The voltage of the power control output of the control loop digital analog converter, preset reference electricity
Pressure and the corresponding voltage of voltage signal for representing power, then with the voltage of the power control output of digital analog converter
In the output end output voltage of control loop after being integrated, the output end output voltage of the control loop is described for controlling
The pre- promotion of power amplification circuit is amplified tube grid and promotes level to amplify the bias voltage of tube grid.
A kind of application method of power amplifier, including：
Predetermined power amplifier output power is obtained, according to the power output and the work(of digital analog converter of power amplifier
The corresponding relation of the output voltage of rate control output end obtains the defeated of the power control output of the digital analog converter that will be used
Go out voltage；The power output of the power amplifier is corresponding with the output voltage of the power control output of digital analog converter to close
System is obtained by being fitted emulation to the power amplifier described in any one provided in an embodiment of the present invention；
The digital analog converter is controlled to be equal to the output voltage of the power control output of the digital analog converter described
The output voltage of the power control output of the digital analog converter that will be used, and it is input to the corresponding input of control loop.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：Above scheme uses control loop
Carry out the dynamic range and accuracy of increase rate control, control loop is performed and compared and integral operation, realizes that the function can be adopted
Realized with hardware inexpensively, therefore above scheme provides a kind of with low cost easy to spread, and Power Control dynamic
Scope and accuracy are preferable.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for embodiment description
Accompanying drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, without having to pay creative labor, it can also be obtained according to these accompanying drawings
His accompanying drawing.
Fig. 1 is the power amplifier structure schematic diagram of the embodiment of the present invention；
Fig. 2 is another power amplifier structure schematic diagram of the embodiment of the present invention；
Fig. 3 is the another power amplifier structure schematic diagram of the embodiment of the present invention；
Fig. 4 is the method flow schematic diagram of the embodiment of the present invention.
Specific embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing the present invention is made into
One step ground is described in detail, it is clear that described embodiment is only some embodiments of the invention, rather than whole implementation
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
All other embodiment, belongs to the scope of protection of the invention.
A kind of power amplifier is the embodiment of the invention provides, as shown in figure 1, power amplification circuit, wherein power amplification
Circuit includes pre- promotion amplifier tube 101, promotes level amplifier tube 102, and antenna 104, and the direction of arrow shown in Fig. 1 is put for power
The sense of current of big circuit, also includes：Control loop；
Above-mentioned control loop include at least three inputs, respectively connect digital analog converter power control output APC,
Predetermined reference voltage 9V_TX（9V_TX, only one predeterminated voltage symbol, it is 9V not represent its voltage）And represent power
Voltage signal；
The voltage signal of above-mentioned expression power can be arbitrary voltage, and its access approaches embodiment of the present invention is refused this
Limit.Subsequent embodiment will provide one of them specific citing.
The output end of above-mentioned control loop connects the pre- grid of promotion amplifier tube 101 of above-mentioned power amplification circuit and promotes level
The grid of amplifier tube 102；It is the voltage of the power control output APC of the above-mentioned more above-mentioned digital analog converter of control loop, above-mentioned pre-
If the corresponding voltage of voltage signal of reference voltage 9V_TX and above-mentioned expression power, then with the power control of digital analog converter
The voltage of output terminals A PC processed be integrated after control loop output end output voltage, the output end of above-mentioned control loop is defeated
Go out voltage for controlling the pre- grid of promotion amplifier tube 101 of above-mentioned power amplification circuit and promoting the inclined of the grid of level amplifier tube 102
Put voltage.
A kind of power amplifier is the embodiment of the invention provides, as shown in Fig. 2 this gives the electricity for representing power
A citing for specific acquisition pattern of signal is pressed, including：Power amplification circuit, wherein power amplification circuit include pre- promotion
Amplifier tube 101, promotion level amplifier tube 102, directional coupler 103 and antenna 104, the direction of arrow shown in Fig. 2 is power amplification
The sense of current of circuit, also includes：Control loop；
Above-mentioned control loop include at least three inputs, respectively connect digital analog converter power control output APC,
Predetermined reference voltage 9V_TX（9V_TX, only one predeterminated voltage symbol, it is 9V not represent its voltage）And above-mentioned power
The directional coupler 103 of amplifying circuit, above-mentioned directional coupler 103 is input into directional coupler to the input of above-mentioned control loop
The forward power that 103 couplings are obtained；
The output end of above-mentioned control loop connects the pre- grid of promotion amplifier tube 101 of above-mentioned power amplification circuit and promotes level
The grid of amplifier tube 102；It is the voltage of the power control output APC of the above-mentioned more above-mentioned digital analog converter of control loop, above-mentioned pre-
If reference voltage 9V_TX and the corresponding voltage of above-mentioned forward power, then with the power control output APC of digital analog converter
Voltage be integrated after control loop output end output voltage, the output end output voltage of above-mentioned control loop is used to control
The pre- grid of promotion amplifier tube 101 for making above-mentioned power amplification circuit and the bias voltage for promoting the grid of level amplifier tube 102.
Above scheme using control loop come increase rate control dynamic range and accuracy, control loop perform compare with
And integral operation, realize that the function can be realized using hardware inexpensively, therefore above scheme provides a kind of with low cost
It is easy to spread, and Power Control the preferable power amplifier of dynamic range and accuracy.
More specifically, the embodiment of the present invention give above-mentioned control loop realize it is above-mentioned compare and integral operation circuit
Figure is, it is necessary to illustrate, realizing the circuit diagram of function above may have many kinds, below citing should not be construed as to of the invention real
Apply unique restriction of example.Above-mentioned control loop includes：Three operational amplifiers：First operational amplifier U1, the second operation amplifier
Device U2 and the 3rd operational amplifier U3；And detection tube D1；
The positive input of U1 connects the power control output APC of digital analog converter, the default ginseng of reverse input end connection
The output end for examining voltage 9V_TX, U1 connects the reverse input end of U2；
The positive input of U2 connects the output end of D1, and the input of D1 connects the directional couple of above-mentioned power amplification circuit
Device 103；Above-mentioned directional coupler 103 couples the forward power for obtaining to above-mentioned D1 input directional couplers 103；The output end of U2
Connect the reverse input end of U3；
The positive input of U3 is connected in the output end connection of the power control output APC, U3 of above-mentioned digital analog converter
State the pre- grid of promotion amplifier tube 101 of power amplification circuit and promote the grid of level amplifier tube 102, the output of the output end of above-mentioned U3
Voltage is used to control the pre- grid of promotion amplifier tube 101 of above-mentioned power amplification circuit and promotes the biasing of the grid of level amplifier tube 102
Voltage.
The power output of power amplifier can be expressed as Pout=A+B×VVGG, wherein A represents the size of input signal, B
×VVGGRepresent the power gain of the pre- amplifier tube for promoting and promoting level.By schematic diagram above（Fig. 3）Can draw：VVGG
=G1×VAPC-G2× VP+C, wherein G1、G2, C be constant in the case where control circuit parameter determines, VP is defeated for detection tube D1
Go out voltage so Pout=BG1×VAPC-BG2× VP+BC+A, so VP is bigger, PoutIt is reduced by, control loop more works.
Scheme provided in an embodiment of the present invention can just realize the control action of reinforcing feedback under low power scenarios, then subtract under high power
Weak VP is to PoutInfluence.
Alternatively, above-mentioned detection tube D1 is Schottky detection tube.
Based on above structure, the operation of control loop is specific as follows：APC is the output voltage of DAC power control outputs,
9V_TX is predetermined reference voltage, the voltage that both are exported by operational amplifier U1 again with forward direction detecting circuit（Antenna end
There is directional coupler 103 before mouthful, forward power is coupled out by directional coupler 103, by Schottky detection tube D1 detections, obtain
To forward direction detecting circuit corresponding with power）Make signed magnitude arithmetic(al) by operational amplifier U2, the voltage of U2 outputs is passed through with APC again
Integral amplifier U3 is crossed, integral amplifier U3 output voltage controls promote amplifier tube 101 and promote the grid of level amplifier tube 102 in advance
Bias voltage, and then control the power output of above-mentioned power amplifier.The power output of power amplifier and the relation of DAC voltage
Can be obtained by carrying out fitting of a polynomial emulation to actual test data.
Based on above scheme, inventor carries out actual test, is below test result：
In MD780U2（U2 is working frequency range 450-520MHz）The circuit is used, the 1W power rises time surveys under normal temperature
Test result is as shown in table 1：
Table 1
- 45 DEG C of power test data of embodiment of the present invention low temperature are as shown in table 2：
Table 2
- 45 DEG C of power rise times of low temperature and the instantaneous adjacent-channel power of transmitting（Adjacent channel power
Transmtted, ACTP）Test data, as shown in table 3：
Table 3
Power rise time and ACTP under normal temperature, as shown in table 4：
Table 4
Power rise time and ACTP at 60 DEG C of high temperature, as shown in table 5：
Table 5
The embodiment of the present invention additionally provides a kind of application method of power amplifier, as shown in figure 4, can in the lump refering to figure
1st, Fig. 2 and Fig. 3, including：
301：Obtain predetermined power amplifier output power；
Above-mentioned predetermined power amplifier output power is the power output of needs, that is, target output.
302：According to the output voltage of the power control output APC of the power output and digital analog converter of power amplifier
Corresponding relation obtain the digital analog converter that will be used power control output APC output voltage；Above-mentioned power amplification
The corresponding relation of the output voltage of the power output of device and the power control output APC of digital analog converter is by of the invention real
The power amplifier for applying any one of example offer is fitted emulation and obtains；
303：Controlling above-mentioned digital analog converter makes output voltage of power control output APC of above-mentioned digital analog converter etc.
In the output voltage of the power control output APC of the above-mentioned digital analog converter that will be used, and it is input to the right of control loop
Answer input.
Above scheme using control loop come increase rate control dynamic range and accuracy, control loop perform compare with
And integral operation, realize that the function can be realized using hardware inexpensively, therefore above scheme provides a kind of with low cost
It is easy to spread, and Power Control the preferable power amplifier of dynamic range and accuracy.Using method used above, can be with
Easily realize Power Control.
In addition, one of ordinary skill in the art will appreciate that realizing all or part of step in above-mentioned each method embodiment
The hardware that program be can be by instruct correlation is completed, and corresponding program can be stored in a kind of computer-readable recording medium
In, storage medium mentioned above can be read-only storage, disk or CD etc..
The present invention preferably specific embodiment is these are only, but protection scope of the present invention is not limited thereto, it is any
Those familiar with the art the change that can readily occur in or replaces in the technical scope that the embodiment of the present invention is disclosed
Change, should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claim
Enclose and be defined.
Claims (5)
1. a kind of power amplifier, including：Power amplification circuit, it is characterised in that also include：Control loop；
The control loop includes at least three inputs, and the power control output of digital analog converter, default ginseng are connected respectively
Examine voltage and represent the voltage signal of power；
The pre- promotion that the output end of the control loop connects the power amplification circuit is amplified tube grid and promotes level amplifier tube
Grid；The voltage and the predetermined reference voltage of the power control output of the control loop digital analog converter,
The first comparative result is obtained, then first comparative result is compared with forward direction detecting circuit, obtain the second comparative result, then
In the defeated of control loop after second comparative result is integrated with the voltage of the power control output of digital analog converter
Go out and hold output voltage, the output end output voltage of the control loop is used to control the pre- promotion of the power amplification circuit to amplify
Tube grid and promotion level amplify the bias voltage of tube grid；It is described represent power the corresponding voltage of voltage signal be：Forward direction work(
The corresponding forward direction detecting circuit of rate.
2. power amplifier according to claim 1, it is characterised in that connection represents that the voltage signal of power includes：
The directional coupler of the power amplification circuit is connected, the directional coupler is input into the input of the control loop
The corresponding voltage signal of forward power that directional coupler coupling is obtained.
3. power amplifier according to claim 2, it is characterised in that the control loop includes：Three operational amplifiers：
First operational amplifier U1, the second operational amplifier U2 and the 3rd operational amplifier U3；And detection tube D1；
The positive input of U1 connects the power control output of digital analog converter, and reverse input end connects predetermined reference voltage,
The output end of U1 connects the reverse input end of U2；
The positive input of U2 connects the output end of D1, and the input of D1 connects the directional coupler of the power amplification circuit；
The forward power that the directional coupler is obtained to D1 input directional coupler couplings；The output end connection U3's of U2 is reverse
Input；
The positive input of U3 connects the power control output of the digital analog converter, and the output end of U3 connects the power and puts
The pre- promotion of big circuit is amplified tube grid and promotes level to amplify tube grid, and the output voltage of the output end of the U3 is used to control institute
The pre- promotion for stating power amplification circuit is amplified tube grid and promotes level to amplify the bias voltage of tube grid.
4. power amplifier according to claim 3, it is characterised in that the detection tube D1 is Schottky detection tube.
5. a kind of application method of power amplifier, it is characterised in that including：
Predetermined power amplifier output power is obtained, according to the power control of the power output and digital analog converter of power amplifier
The corresponding relation of the output voltage of output end processed obtains the output electricity of the power control output of the digital analog converter that will be used
Pressure；The power output of the power amplifier is led to the corresponding relation of the output voltage of the power control output of digital analog converter
Cross and emulation is fitted to the power amplifier described in Claims 1-4 any one obtains；
Control the digital analog converter make the output voltage of the power control output of the digital analog converter be equal to it is described will
The output voltage of the power control output of the digital analog converter for using, and it is input to the corresponding input of control loop.
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| CN201310179930.3A CN103248328B (en) | 2013-05-15 | 2013-05-15 | Power amplifier and utilization method |
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| CN201310179930.3A CN103248328B (en) | 2013-05-15 | 2013-05-15 | Power amplifier and utilization method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105338598B (en) * | 2014-07-29 | 2020-10-20 | 锐迪科（重庆）微电子科技有限公司 | Power calibration method and terminal |
| CN110687959A (en) * | 2019-08-15 | 2020-01-14 | 鹤壁天海电子信息系统有限公司 | Power control device and control circuit thereof, integral comparator and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1128916A (en) * | 1994-11-01 | 1996-08-14 | 摩托罗拉公司 | Method and device for improving efficiency of amplitude |
| CN1488189A (en) * | 2000-11-24 | 2004-04-07 | �����ɷ� | Amplifier circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004328107A (en) * | 2003-04-22 | 2004-11-18 | Renesas Technology Corp | Semiconductor integrated circuit for high frequency power amplification and electronic component for high frequency power amplification, and wireless communication system |
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2013
- 2013-05-15 CN CN201310179930.3A patent/CN103248328B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1128916A (en) * | 1994-11-01 | 1996-08-14 | 摩托罗拉公司 | Method and device for improving efficiency of amplitude |
| CN1488189A (en) * | 2000-11-24 | 2004-04-07 | �����ɷ� | Amplifier circuit |
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