CN103248328A - Power amplifier and utilization method - Google Patents
Power amplifier and utilization method Download PDFInfo
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- CN103248328A CN103248328A CN2013101799303A CN201310179930A CN103248328A CN 103248328 A CN103248328 A CN 103248328A CN 2013101799303 A CN2013101799303 A CN 2013101799303A CN 201310179930 A CN201310179930 A CN 201310179930A CN 103248328 A CN103248328 A CN 103248328A
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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, particularly a kind of power amplifier and using method.
Background technology
Present digital mobile radio communication (Digital mobile radio, DMR) Vehicle mounted station, its power control dynamic range is generally 10～16Db, and for example: maximum transmission power can reach 45W, minimum emissive power can reach 5W, and the dynamic range of power control can reach 10dB.The DMR Vehicle mounted station that also has following classification, peak power output are 40W, and minimum output power is 1W, and dynamic range is 16dB.
Present Hytera(BESTA) digital Vehicle mounted station, during less than minimum emissive power, the power rise time can lengthen rapidly, exceeds the setting of 1.5ms in transmitting power.In addition, when low temperature, transmitting power also can descend rapidly.In order to address the above problem, can solve by the dynamic range that increases power control, the scheme of the dynamic range of power control at present generally has following two kinds:
One, by the directional coupler forward emitting power of taking a sample, utilize logarithmic amplifier that forward power is converted to the voltage linear with it and control power amplifier (Power amplifier, PA) promote the grid voltage of level, thereby control the power output of PA.Generally adopt in this scheme for example AD8315(radio frequency detection and control integrated circuit) logarithmic amplifier, its main advantage is that very wide dynamic range (can reach 50dB, the actual power control dynamic range of using is 2050dB), power output and input power control voltage are linear, inner integrated integrator, the dynamic range of control loop flexibly.
This scheme can be controlled dynamic range and the sequential on power control loop road flexibly, but the AD8315 price is higher, the circuit complexity, and high low temperature needs more temperature-compensation circuit, and software arranges more complicated; Therefore this scheme realizes the cost height.
Two, by the directional coupler forward emitting power of taking a sample, the voltage and digital to analog converter (the Digital to Analog Converter that utilize detection tube to detect, DAC) grid voltage that PA promotes level is controlled in the affected signed magnitude arithmetic(al) of the power of output control voltage, thus the power output of control PA.
This scheme hardware and software cost is very low, but the dynamic range of power control is lower.
Based on above explanation, provide with low cost being easy to promote, and the dynamic range of power control and accuracy preferably power amplifier become the comparatively urgent demand of industry.
Summary of the invention
The embodiment of the invention provides a kind of method of improving power control dynamic range, is used for providing a kind of with low cost being easy to promote, and the dynamic range of power control and accuracy power amplifier preferably.
A kind of power amplifier comprises: power amplification circuit also comprises: control loop;
Described control loop comprises at least three inputs, respectively the voltage signal of the power control output end of linking number weighted-voltage D/A converter, preset reference voltage and expression power;
The output of described control loop connects the pre-promotion amplifier tube grid of described power amplification circuit and promotes level amplifier tube grid; The voltage of the voltage signal correspondence of the voltage of the power control output end of the more described digital to analog converter of described control loop, described preset reference voltage and described expression power, carry out behind the integration at the output output voltage of control loop with the voltage of the power control output end of digital to analog converter then, the output output voltage of described control loop is used for the pre-promotion amplifier tube grid of the described power amplification circuit of control and promotes the bias voltage of level amplifier tube grid.
A kind of using method of power amplifier comprises:
Obtain predetermined electric power amplifier power output, obtain the output voltage of the power control output end of the digital to analog converter that will use according to the corresponding relation of the output voltage of the power control output end of the power output of power amplifier and digital to analog converter; The corresponding relation of the output voltage of the power control output end of the power output of described power amplifier and digital to analog converter carries out match emulation by any described power amplifier that the embodiment of the invention is provided and obtains;
Control the output voltage that described digital to analog converter makes the power control output end of described digital to analog converter and equal the output voltage of the power control output end of the described digital to analog converter that will use, and be input to the corresponding input of control loop.
As can be seen from the above technical solutions, the embodiment of the invention has the following advantages: above scheme uses control loop to come dynamic range and the accuracy of the control of raising rate, control loop is carried out comparison and integral operation, realize that this function can adopt comparatively cheap hardware to realize, therefore above scheme provides a kind of with low cost being easy to promote, and dynamic range and the accuracy of power control are better.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is briefly introduced in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the power amplifier structure schematic diagram of the embodiment of the invention;
Fig. 2 is another power amplifier structure schematic diagram of the embodiment of the invention;
Fig. 3 is the another power amplifier structure schematic diagram of the embodiment of the invention;
Fig. 4 is the method flow schematic diagram of the embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, and obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtain under the creative work prerequisite.
The embodiment of the invention provides a kind of power amplifier, 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, the direction of arrow shown in Figure 1 is the sense of current of power amplification circuit, also comprises: control loop;
Above-mentioned control loop comprises at least three inputs, power control output end APC, the preset reference voltage 9V_TX(9V_TX of difference linking number weighted-voltage D/A converter, only be a predeterminated voltage symbol, not representing its voltage is 9V) and the expression power voltage signal;
The voltage signal of above-mentioned expression power can be voltage arbitrarily, and it obtains approach embodiment of the invention and will not limit this.Subsequent embodiment will provide one of them concrete giving an example.
The output of above-mentioned control loop connects pre-promotion amplifier tube 101 grids of above-mentioned power amplification circuit and promotes level amplifier tube 102 grids; The voltage of the voltage signal correspondence of the voltage of the power control output end APC of the more above-mentioned digital to analog converter of above-mentioned control loop, above-mentioned preset reference voltage 9V_TX and above-mentioned expression power, carry out behind the integration at the output output voltage of control loop with the voltage of the power control output end APC of digital to analog converter then, the output output voltage of above-mentioned control loop is used for pre-promotion amplifier tube 101 grids of the above-mentioned power amplification circuit of control and promotes the bias voltage of level amplifier tube 102 grids.
The embodiment of the invention provides a kind of power amplifier, as shown in Figure 2, present embodiment provided expression power voltage signal concrete acquisition mode for example, comprise: power amplification circuit, wherein power amplification circuit includes pre-promotion amplifier tube 101, promotes level amplifier tube 102, directional coupler 103 and antenna 104, the direction of arrow shown in Figure 2 is the sense of current of power amplification circuit, also comprises: control loop;
Above-mentioned control loop comprises at least three inputs, power control output end APC, the preset reference voltage 9V_TX(9V_TX of difference linking number weighted-voltage D/A converter, it only is a predeterminated voltage symbol, not representing its voltage is 9V) and the directional coupler 103 of above-mentioned power amplification circuit, the forward power that above-mentioned directional coupler 103 obtains to input input directional coupler 103 couplings of above-mentioned control loop;
The output of above-mentioned control loop connects pre-promotion amplifier tube 101 grids of above-mentioned power amplification circuit and promotes level amplifier tube 102 grids; The voltage of the voltage of the power control output end APC of the more above-mentioned digital to analog converter of above-mentioned control loop, above-mentioned preset reference voltage 9V_TX and above-mentioned forward power correspondence, carry out behind the integration at the output output voltage of control loop with the voltage of the power control output end APC of digital to analog converter then, the output output voltage of above-mentioned control loop is used for pre-promotion amplifier tube 101 grids of the above-mentioned power amplification circuit of control and promotes the bias voltage of level amplifier tube 102 grids.
Above scheme uses control loop to come dynamic range and the accuracy of the control of raising rate, control loop is carried out comparison and integral operation, realize that this function can adopt comparatively cheap hardware to realize, therefore above scheme provides a kind of with low cost being easy to promote, and the dynamic range controlled of power and accuracy power amplifier preferably.
More specifically, the embodiment of the invention has provided the circuit diagram that above-mentioned control loop is realized above-mentioned comparison and integral operation, need to prove that the circuit diagram of realizing above function may have a variety of, below should not be construed as unique restriction to the embodiment of the invention for example.Above-mentioned control loop comprises: three operational amplifiers: the first operational amplifier U1, the second operational amplifier U2 and the 3rd operational amplifier U3; And detection tube D1;
The power control output end APC of the positive input linking number weighted-voltage D/A converter of U1, reverse input end connect preset reference voltage 9V_TX, and the output of U1 connects the reverse input end of U2;
The positive input of U2 connects the output of D1, and the input of D1 connects the directional coupler 103 of above-mentioned power amplification circuit; The forward power that above-mentioned directional coupler 103 obtains to 103 couplings of above-mentioned D1 input directional coupler; The output of U2 connects the reverse input end of U3;
The positive input of U3 connects the power control output end APC of above-mentioned digital to analog converter, the output of U3 connects pre-promotion amplifier tube 101 grids of above-mentioned power amplification circuit and promotes level amplifier tube 102 grids, and the output voltage of the output of above-mentioned U3 is used for pre-promotion amplifier tube 101 grids of the above-mentioned power amplification circuit of control and promotes the bias voltage of level amplifier tube 102 grids.
The power output of power amplifier can be expressed as P
Out=A+B * V
VGG, wherein A represents the size of input signal, B * V
VGGThe pre-power gain that promotes and promote the amplifier tube of level of expression.(Fig. 3) can draw by top schematic diagram: V
VGG=G
1* V
APC-G
2* VP+C, wherein G
1, G
2, C is constant under the situation that the control circuit parameter is determined, VP is the output voltage of detection tube D1. P so
Out=BG
1* V
APC-BG
2* VP+BC+A, so VP is more big, P
OutJust reduce, control loop just more works.The scheme that the embodiment of the invention provides just can be implemented in the control action that strengthens loop under the low-power situation, the next P of VP that weakens of high power
OutInfluence.
Alternatively, above-mentioned detection tube D1 is the 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 output end, 9V_TX is preset reference voltage, both (have directional coupler 103 with the forward direction detecting circuit again through the voltage that operational amplifier U1 obtains exporting before the antenna port, be coupled out forward power by directional coupler 103, by Schottky detection tube D1 detection, obtain the forward direction detecting circuit corresponding with power) do signed magnitude arithmetic(al) through operational amplifier U2, the voltage of U2 output passes through integral amplifier U3 with APC again, the control of integral amplifier U3 output voltage is pre-to promote amplifier tube 101 and the gate bias voltage that promotes level amplifier tube 102, and then controls the power output of above-mentioned power amplifier.The relation of the power output of power amplifier and DAC voltage can obtain by actual test data is carried out fitting of a polynomial emulation.
Based on above scheme, the inventor carries out actual test, below is test result:
Be working frequency range 450-520MHz at MD780U2(U2) used this circuit, 1W power rise time test result is as shown in table 1 under the normal temperature:
Table 1
Embodiment of the invention low temperature-45 ℃ power test data are as shown in table 2:
Table 2
Low temperature-45 ℃ power rise time and the instantaneous adjacent-channel power of emission (Adjacent channel power transmtted, ACTP) test data, as shown in table 3:
Table 3
Power rise time and ACTP under the normal temperature, as shown in table 4:
Table 4
High temperature 60 ℃ of following power rise time and ACTP, as shown in table 5:
Table 5
The embodiment of the invention also provides a kind of using method of power amplifier, as shown in Figure 4, can consult Fig. 1, Fig. 2 and Fig. 3 in the lump, comprising:
301: obtain predetermined electric power amplifier power output;
Above-mentioned predetermined electric power amplifier power output namely is the power output that needs, just target output.
302: the output voltage that obtains the power control output end APC of the digital to analog converter that will use according to the corresponding relation of the output voltage of the power control output end APC of the power output of power amplifier and digital to analog converter; The corresponding relation of the output voltage of the power control output end APC of the power output of above-mentioned power amplifier and digital to analog converter carries out match emulation by any one power amplifier that the embodiment of the invention is provided and obtains;
303: control the output voltage that above-mentioned digital to analog converter makes the power control output end APC of above-mentioned digital to analog converter and equal the output voltage of the power control output end APC of the above-mentioned digital to analog converter that will use, and be input to the corresponding input of control loop.
Above scheme uses control loop to come dynamic range and the accuracy of the control of raising rate, control loop is carried out comparison and integral operation, realize that this function can adopt comparatively cheap hardware to realize, therefore above scheme provides a kind of with low cost being easy to promote, and the dynamic range controlled of power and accuracy power amplifier preferably.Adopt above using method, can realize power control easily.
In addition, one of ordinary skill in the art will appreciate that all or part of step that realizes among above-mentioned each method embodiment is to instruct relevant hardware to finish by program, corresponding program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
Below only be the preferable embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the embodiment of the invention discloses, the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (5)
1. power amplifier comprises: power amplification circuit, it is characterized in that, and also comprise: control loop;
Described control loop comprises at least three inputs, respectively the voltage signal of the power control output end of linking number weighted-voltage D/A converter, preset reference voltage and expression power;
The output of described control loop connects the pre-promotion amplifier tube grid of described power amplification circuit and promotes level amplifier tube grid; The voltage of the voltage signal correspondence of the voltage of the power control output end of the more described digital to analog converter of described control loop, described preset reference voltage and described expression power, carry out behind the integration at the output output voltage of control loop with the voltage of the power control output end of digital to analog converter then, the output output voltage of described control loop is used for the pre-promotion amplifier tube grid of the described power amplification circuit of control and promotes the bias voltage of level amplifier tube grid.
2. according to the described power amplifier of claim 1, it is characterized in that the voltage signal that connects expression power comprises:
The directional coupler that connects described power amplification circuit, described directional coupler is imported the forward power that the directional coupler coupling obtains to the input of described control loop;
The voltage of the voltage signal correspondence of described expression power is: the voltage of described forward power correspondence.
3. according to the described power amplifier of claim 2, it is characterized in that described control loop comprises: three operational amplifiers: the first operational amplifier U1, the second operational amplifier U2 and the 3rd operational amplifier U3; And detection tube D1;
The power control output end of the positive input linking number weighted-voltage D/A converter of U1, reverse input end connects preset reference voltage, and the output of U1 connects the reverse input end of U2;
The positive input of U2 connects the output of D1, and the input of D1 connects the directional coupler of described power amplification circuit; The forward power that described directional coupler obtains to the coupling of described D1 input directional coupler; The output of U2 connects the reverse input end of U3;
The positive input of U3 connects the power control output end of described digital to analog converter, the output of U3 connects the pre-promotion amplifier tube grid of described power amplification circuit and promotes level amplifier tube grid, and the output voltage of the output of described U3 is used for the pre-promotion amplifier tube grid of the described power amplification circuit of control and promotes the bias voltage of level amplifier tube grid.
4. according to the described power amplifier of claim 3, it is characterized in that described detection tube D1 is the Schottky detection tube.
5. the using method of a power amplifier is characterized in that, comprising:
Obtain predetermined electric power amplifier power output, obtain the output voltage of the power control output end of the digital to analog converter that will use according to the corresponding relation of the output voltage of the power control output end of the power output of power amplifier and digital to analog converter; The corresponding relation of the output voltage of the power control output end of the power output of described power amplifier and digital to analog converter obtains by any described power amplifier of claim 1 to 4 is carried out match emulation;
Control the output voltage that described digital to analog converter makes the power control output end of described digital to analog converter and equal the output voltage of the power control output end of the described digital to analog converter that will use, and be input to the corresponding input of control loop.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105338598A (en) * | 2014-07-29 | 2016-02-17 | 重庆重邮信科通信技术有限公司 | 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 (3)
| 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 |
| US20060139094A1 (en) * | 2003-04-22 | 2006-06-29 | Renesas Technology Corp. | Semiconductor integrated circuit for high frequency power amplifier, electronic component for high frequency power amplifier, and radio communication system |
-
2013
- 2013-05-15 CN CN201310179930.3A patent/CN103248328B/en active Active
Patent Citations (3)
| 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 |
| US20060139094A1 (en) * | 2003-04-22 | 2006-06-29 | Renesas Technology Corp. | Semiconductor integrated circuit for high frequency power amplifier, electronic component for high frequency power amplifier, and radio communication system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105338598A (en) * | 2014-07-29 | 2016-02-17 | 重庆重邮信科通信技术有限公司 | Power calibration method and terminal |
| 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 |
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| CN103248328B (en) | 2017-05-24 |
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