CN201015188Y - Linear power amplifier device - Google Patents
Linear power amplifier device Download PDFInfo
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- CN201015188Y CN201015188Y CNU2006200152912U CN200620015291U CN201015188Y CN 201015188 Y CN201015188 Y CN 201015188Y CN U2006200152912 U CNU2006200152912 U CN U2006200152912U CN 200620015291 U CN200620015291 U CN 200620015291U CN 201015188 Y CN201015188 Y CN 201015188Y
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Abstract
A linear power amplification device comprises two great function circuits: a radio frequency amplification circuit and a testing and control circuit, of which the radio frequency amplification circuit consists of a 1st power amplifier, a temperature compensated resistance, a 2nd power amplifier, a digital controlled attenuator, a 3rd power amplifier, a 4th power amplifier and a circular device orderly in series connection; The radiofrequency amplification circuit can do the linear amplification on the input radio frequency signal through the four power amplifiers, and the digital control attenuation is added to the digital controlled attenuator at the same time, so as to match the required gain of the whole device; the testing and control circuit consists of a detecting circuit and a ALC control loop with the automatic gain control function, so as to control the maximum output power of the whole circuit; an output power testing circuit and a reflected power testing circuit are respectively coupled with an input terminal and a reverted output terminal of the circular device for testing the output power and the reflected power. In addition, the utility model also provides a PCB board structure of the device, so that the cost is lower, the complexity of the module is simpler, the reliability and the production efficiency are higher.
Description
Technical field
The utility model relates to the electronic technology of the communications field, relates in particular to the power amplifier technology of the communications field.
Background technology
The fast development of Modern wireless communication improves the availability of frequency spectrum of channel and the direction of the raising linearity and develops day by day towards increasing information capacity.On the one hand, extensively adopt the HIGH-POWERED MICROWAVES transistor that works in the class AB state to improve through-put power and utilization ratio; On the other hand, the introducing of passive device and active device, the employings of multicarrier configuring technical etc. all will cause the intermodulation distortion of output signal.Therefore, when the design radio-frequency power amplifier, must carry out linearization process, so that make output signal obtain the better linearity degree to it.General linearization technique commonly used comprises: back-off, predistortion, feedforward etc., wherein, the back-off technology can effectively be improved the linearity of narrow band signal, and pre-distortion technology and feed-forward technique, feed-forward technique particularly, because it has high calibration accuracy, high stability and be not subjected to advantage such as bandwidth constraints becomes the major technique that is adopted when improving the broadband signal linearity.
Distortion linearizing method mainly is to insert components for predistortion before power amplifier, the input signal that causes power amplifier is distorton in advance, and its distorted characteristic is just in time opposite with the power discharging device non-linear behaviour, thereby reach many, the essentially identical linear power amplification effect of other characteristics and input signal in amplitude increase of system's output appearance.For guaranteeing certain linearisation bandwidth, need add supervisory circuit, in conjunction with components for predistortion, the nonlinear characteristic of AM-AM of emulation power amplifier (amplitude modulation-amplitude modulation) and AM-PM (amplitude modulation-phase modulation).But accurately AM-AM, the AM-PM characteristic of emulation power tube under conditions such as various environment, feed voltage, operating frequency, power level is very difficult, so linearisation index, the self adaptation bandwidth of operation of realization are not satisfactory.Therefore, this type of linear power amplifier still is in laboratory and small lot batch manufacture stage at present, perhaps as the auxiliary realization means of feed forward type linear power amplifier.
Feedforward linearized method is meant that mainly the feedforward linear amplifier is by two loops of compositions such as coupler, attenuator, synthesizer, delay line, power splitter.After the radiofrequency signal input, be divided into two-way through power splitter.One the tunnel enters main power amplifier, because its nonlinear distortion, output also has third order intermodulation to disturb except the dominant frequency signal that needs to amplify is arranged.The a part of signal of coupling from the output of main power amplifier by the main carrier frequency signal of loop 1 counteracting amplifier, makes its remaining anti-phase third order intermodulation component.The third order intermodulation component is offset the intermodulation component of the non-linear generation of main amplifiers by loop 2 after booster amplifier amplifies, thus improve the linearity of power amplifier.This method is subjected to ambient temperature, and factor affecting such as operating voltage are less, and the linearisation index is higher, the bandwidth of operation broad.But, though this technology is comparatively ripe,, adopt this method cost higher for the power amplifier of middle low power, debugging is trouble relatively, is unfavorable for large-scale production.
Back-off is relatively simple linearisation means, uses also very general.Its principle is very simple, promptly selects for use the high power device derate to use, and makes power tube be operated in the best state of the linearity.When input power reduced 1dB, the third order intermodulation coefficient improved 2dB.Power output at this time all can be far below the 1dB compression point of power tube.But obtain better linearity in this way owing to make, need more back-off, so, limited the exploitation of high-power Linear Power Amplifier greatly for bigger bottleneck is just arranged in the realization of high-power power amplifier Linear Power Amplifier.
In sum, in the realization of middle low power power amplifier, it is lower to be necessary to design a kind of cost, and the module complexity is lower, and reliability is higher, and production efficiency is higher, is suitable as the power power amplification device of large-scale production more.
The utility model content
In view of this, the utility model provides a kind of linear power amplifying device, makes cost lower, and the module complexity is lower, and reliability is higher, and production efficiency is higher, is suitable as large-scale production more.
A kind of linear power amplifying device, comprise two big functional circuits: radio frequency amplifying circuit, detect and control circuit, wherein, described radio frequency amplifying circuit comprises first power amplifier of polyphone successively, temperature compensation resistance, second power amplifier, numerical-control attenuator, the 3rd power amplifier, the 4th power amplifier and circulator, radio frequency amplifying circuit carries out linear amplification by four power amplifiers with the radiofrequency signal of input, numerical-control attenuator adds the numerical control decay simultaneously, thereby cooperates complete machine need adjust gain; Described detection and control circuit comprise detecting circuit and have the ALC control loop of the first amplifier valve composition of automatic gain control function, control with the peak power output to entire circuit; Respectively with the ouput power detection circuit and the reflection power testing circuit of circulator input and inverse output terminal coupling, so that power output and reflection power are detected.
Described ouput power detection circuit comprises single-chip microcomputer, amplifier tube, detection tube, the load resistance of polyphone successively, detection tube is to being coupled with the 4th power amplifier to circulator between the load resistance, obtain the output signal that is coupled by coupling, draw one group by detection tube and change one group of magnitude of voltage of corresponding linearity with power output, amplify by amplifier tube then, single-chip microcomputer is sent in decoupling, realizes the accurate monitoring to power output.
Described reflection power testing circuit comprises single-chip microcomputer, amplifier tube, detection tube and first load resistance of polyphone successively, circulator links to each other with second load resistance, be coupled between detection tube to the first load resistance and between circulator to the second load resistance, obtain the output signal that is coupled by coupling, draw one group by detection tube and change one group of magnitude of voltage of corresponding linearity with power output, amplify by amplifier tube then, single-chip microcomputer is sent in decoupling, realizes the accurate monitoring to output reflection power.
The voltage that comes out from described detection tube amplifies through amplifier, then by a comparator, adjusts threshold voltage, when the power overrate, the voltage of comparator surpasses threshold voltage, and the comparator output level changes, single-chip microcomputer cuts off grid voltage automatically, exports the merit alarm signal simultaneously; Or, in described single-chip microcomputer, use software setting to cross the merit thresholding, when single detection output power value was worth greater than threshold power, single-chip microcomputer cut off grid voltage automatically, exports the merit alarm signal simultaneously.
Described detection and control circuit specifically comprise shunt, comparison amplifying circuit, the single-chip microcomputer of polyphone successively, the resistance of a high-power little resistance of serial connection behind voltage input end, shunt is got its two ends pressure reduction, by handling, obtain the voltage output of a linear change, and then by comparing amplifying circuit adjustment multiplication factor adjustment output valve, deliver to single-chip microcomputer after the decoupling, in single-chip microcomputer, pass through thresholding of software setting, when bringing voltage above this thresholding, the supply of cutting off grid voltage falls in single-chip microcomputer, sends alarm signal simultaneously.
Described detection and control circuit comprise that specifically the single-chip microcomputer of contacting successively, digital-to-analogue transform chip, amplifier, power tube grid, single-chip microcomputer is provided with output grid voltage value, single-chip microcomputer output transforms the different voltage of chip output by a digital-to-analogue amplifies it by a certain percentage through an amplifier, delivers to the grid of power tube.
Described detection and control circuit specifically comprise temperature sensor, amplifier, single-chip microcomputer successively, temperature sensor detects the temperature of the 4th power amplifier, and be converted to the voltage that output voltage obtains one group of linearity corresponding with temperature, and amplify by amplifier then, deliver to the chip microcontroller monitoring at last.
Described ALC control loop comprises the relatively amplification voltage stabilizing circuit that links to each other with amplifier tube, described detection tube links to each other with a load resistance, detection tube is to being coupled with the 4th power amplifier to circulator between the load resistance, obtain the output signal that is coupled by coupling, with ouput power detection circuit resulting with the corresponding magnitude of voltage of power output through one group of amplification, deliver to the control voltage discrepancy pin of amplifier tube then, thereby realize control to power output, when power output exceeds preset value than rated power, to detect magnitude of voltage this raised area of decaying according to power output in amplifier tube inside, thereby the power output that guarantees power amplifier keeps the power-handling capability of design.
A kind of linear power amplifying device, wherein, the PCB of this linear power amplifying device is designed to two-ply: ground floor (top layer) microwave panel, copper thickness is 0.0035mm, is mainly used in the main wiring and the part power line of radio frequency wiring and digital circuit; The second layer (bottom) is a ground plate, and copper thickness is 0.0035mm, is mainly used in the wiring of part power line and part digital circuit.
But described whole pcb board is divided into the chamber of three individual screen aspect layout connects up: first cavity comprises first power amplifier, second power amplifier, temperature-compensation circuit, ALC control circuit and numerical-control attenuator, temperature sensing circuit, single-chip microcomputer digital circuit and current detection circuit and ouput power detection circuit and backward power testing circuit; Second cavity is for being the 3rd power amplifier; The 3rd cavity is the 4th power amplifier.
Compared with prior art, the linear power amplifying device that the utility model provided since circuit design on and carried out certain design on the pcb board structure, make cost lower; the module complexity is lower; reliability is higher, and production efficiency is higher, is suitable as large-scale production more.
Description of drawings
Fig. 1 is a kind of radio frequency amplifying circuit schematic diagram of the utility model better embodiment;
Fig. 2 is a kind of detection and the control circuit schematic diagram of the utility model better embodiment;
Fig. 3 is that the power output of the utility model better embodiment detects and cross merit warning circuit schematic diagram;
Fig. 4 is that the utility model better embodiment reflection power detects schematic diagram;
Fig. 5 is the overcurrent warning circuit schematic diagram of the utility model better embodiment;
Fig. 6 is the grid voltage control circuit schematic diagram of the utility model better embodiment;
Fig. 7 is the grid voltage ALC control circuit schematic diagram of the utility model better embodiment.
Embodiment
For the purpose, technical scheme, the advantage that make the utility model is clearer and more definite, clear, the technical scheme of the utility model is described in further detail below in conjunction with embodiment, accompanying drawing.
The middle power linear power amplifier of the utility model first better embodiment mainly is made up of two big functional circuits: radio frequency amplifying circuit 11, detect and control circuit 12.
As shown in Figure 1, described radio frequency amplifying circuit 11 further comprises power amplifier 110,111,112,113, numerical-control attenuator 114, isolator 115, circulator 116, temperature compensation resistance 117.
As shown in Figure 2, described detection and control circuit 12 further comprise single-chip microcomputer 120, and digital-to-analogue transforms chip 121, detection tube 122, detection tube 123, temperature detection chip 124, shunt 125, in addition, detection according to function can comprise different unit and syndeton with control circuit 12, the shunt of polyphone successively be can comprise as detection and control circuit 12, amplifying circuit, single-chip microcomputer compared, can be as described below as for other structure.
Described radio frequency amplifying circuit 11 is responsible for the radiofrequency signal of the RF of institute input interface 100 inputs is carried out linear amplification, adds the numerical control decay simultaneously, thereby cooperates complete machine need adjust gain, is exporting from RF output interface 118.Described detection and control circuit 12 are responsible for power output, radiant power, and temperature, electric current detects; To grid voltage, power threshold, threshold is controlled; And logical thresholding system is set power amplifier was carried out merit, the protection of overcurrent.
This better embodiment is on device is selected, and the power output of each amplifier tube all is lower than its 1dB compression point and by calculating, at its linearity power points preferably.Simultaneously selecting final stage power amplifier tube (power amplifier 113) and promote to have selected the less device of operating current in the amplifier tube (power amplifier 112), in order to raise the efficiency.Consider simultaneously there is no small change in gain in device under high low temperature, therefore adopted hardware temperature compensation and software temperature compensation to combine in this device, gain compensates with variation of temperature to power tube simultaneously.In addition, for cooperating complete machine gain requirement, on the power amplifier module radio frequency path, increased numerical-control attenuator 114, thereby can control the overall gain of power amplifier module by single-chip microcomputer 120, in noise that takes into full account 114 pairs of module whole of numerical-control attenuator and linear influence, determine that it is positioned over first order amplifier (power amplifier 110) afterwards, like this can be so that noise factor and linear index institute are influenced all not too big.
As shown in Figure 1, the radio frequency amplifying circuit of power linear power amplifier partly uses level Four to amplify among this better embodiment, the first order is selected the first amplifier valve VGA (power amplifier 110) with automatic gain control function for use, cooperate ALC to form control loop, the power output of controlling whole power amplifier is constant, controls with the peak power output to entire circuit.Afterbody power tube (power amplifier 113), mainly be to consider its power output, can in the output rated output power, slightly be better than designing requirement by linear index, penultimate stage is as the promotion level (power amplifier 112) of power amplifier, and its power output is decided according to the gain of afterbody and the rated output power of power amplifier.The design of the second level (power amplifier 111) is to be relatively easy to since select many, and this above power grade the general surplus of ACPR value be bigger.
As shown in Figure 2, detection and control circuit 12 are responsible for power output, radiant power, and temperature, electric current detects; To grid voltage, power threshold, threshold is controlled; And logical thresholding system be set power amplifier was carried out merit, the protection of overcurrent specifically can be as described below.
For detecting power output, the power output of this better embodiment detects and crosses the merit warning circuit can be as shown in Figure 3, the realization of this detection is by microstrip line coupling output signal, also be radiofrequency signal when power amplifier 113 passes to circulator 116, by this process microstrip line, the coupling output signal that attenuator 126,50 ohm load of detection and control circuit 12 are 127, draw one group by detection tube 122 and change one group of magnitude of voltage of corresponding linearity with power output, amplify by amplifier tube 131 then, single-chip microcomputer 120 is sent in decoupling.Then, connect with the outside,, and exported the merit alarm signal with the accurate monitoring of comparator 128 realizations of crossing a parallel connection to power output by the communication function chip.
Crossing the merit alarm is to detect the voltage process amplifier amplification that the detection tube that detects 122 comes out according to power output, then by a comparator 128, adjust threshold voltage, when the power overrate, the voltage of comparator 128 input pins will be above threshold voltage, and in this time, comparator 128 output levels change, single-chip microcomputer 120 cuts off grid voltage automatically, exports the merit alarm signal simultaneously.Simultaneously also can use software setting to cross the merit thresholding in single-chip microcomputer, when single detection output power value was worth greater than threshold power, single-chip microcomputer 120 cuts off grid voltages automatically, exports the merit alarm signal simultaneously.
Reflection power detects, and can be the reflection power testing circuit schematic diagram of this better embodiment with reference to figure 4.The method of the implementation method of this detection and detection power output is roughly the same, it is its coupling path difference, reflected power signal is exported by entering detection tube 122 behind the attenuator 126 by circulator 116 tripods of output, be attenuator 126 continuous 50 ohm load 127, circulator 116 continuous 50 ohm load 130, they link to each other and partly are coupled, and obtain the output signal that is coupled.
Temperature detection, this detection is the temperature for detection module final stage power amplifier tube power amplifier 113, in order to outer monitoring, but more important role is according to this temperature detection, can realize power amplifier is gained under different temperatures and grid voltage compensates by single-chip microcomputer 120.To guarantee the constant and favorable linearity index of power amplifier in the gain of total temperature section.Its implementation is exactly the temperature by a temperature sensor detection power amplifier 113, temperature sensor is converted to the voltage that output voltage obtains one group of linearity corresponding with temperature with temperature information, amplify by amplifier then, improve its sensitivity, deliver to single-chip microcomputer 120 at last and realize monitoring.
Foregoing description be among this better embodiment in the power linear power amplifier course of work, power output detects, reflection power detects, the testing process of temperature detection, followingly describes some other testing process again in detail and alarms process accordingly.
As shown in Figure 5, be overcurrent warning circuit schematic diagram, comprise successively polyphone+28V voltage input end 151, high-power small resistor value sample resistance 152, be powered system (+28V) 153; Chuan Lian shunt 125, relatively amplifying circuit 154, single-chip microcomputer 120, wherein sample resistance 152 and shunt 125 parallel connections successively.The electric current that this detection detects refers to the electric current of 28V power supply, its implementation is the sample resistance 152 of a high-power little resistance of serial connection after 28V input 151, shunt 125 is got its two ends pressure reduction then, by handling, obtain the voltage output of a linear change, and then by comparing amplifying circuit 154 amplifiers adjustment multiplication factor adjustment output valve, deliver to single-chip microcomputer 120 after the decoupling, in single-chip microcomputer 120, pass through thresholding of software setting, when bringing voltage above this thresholding, the supply of cutting off grid voltage falls in single-chip microcomputer 120, sends alarm signal simultaneously.
As shown in Figure 6, be grid voltage control circuit schematic diagram, this grid voltage control mainly is the grid voltage that is used for controlling several power tubes (power amplifier 110,111,112,113), its implementation is to single-chip microcomputer 120 output grid voltage value to be set by outer monitoring, single-chip microcomputer 120 output transforms chip (DAC) 121 by a digital-to-analogue and exports different voltage and through an amplifier 161 it is amplified by a certain percentage, delivers to the grid 162 of power tube.
As shown in Figure 7, be grid voltage ALC control circuit schematic diagram, this grid voltage control circuit realizes that mainly the power output of whole power amplifier is very fixed, in conjunction with Fig. 1, in Fig. 7, the temperature compensation resistance 117 of intermediate circuit 170 alternate figures 1 is to the circuit of isolator 115, its implementation be with ouput power detection circuit (as Fig. 3) resulting with the corresponding magnitude of voltage of power output through one group of amplification, deliver to the control voltage discrepancy pin of amplifier tube 131 then, thereby realize control power output.When power output exceeds set point XdB than rated power, to detect magnitude of voltage decay XdB according to power output in amplifier tube 131 inside, thereby guarantee that by comparison, amplification, voltage stabilizing circuit 172 power output of power amplifier keeps the power-handling capability of design, and can not increase.
The power amplifier module that this better embodiment provided, PCB is designed to two-ply: sheet material adopts the RO 4350 of Rogers, ground floor (top layer) microwave panel, copper thickness is 0.0035mm, is mainly used in the main wiring and the part power line of radio frequency wiring and digital circuit; The second layer (bottom) is a ground plate, and copper thickness is 0.0035mm, is mainly used in the wiring of part power line and part digital circuit.For preventing that circuit from forming positive feedback by the space, back level large-signal impacts the input of prime power tube, and take into full account box body and limit size and make every effort to make the each several part circuit minimum that influences each other, but whole pcb board is divided into the chamber of 3 individual screen aspect layout connects up: two-stage amplifying circuit, temperature-compensation circuit, ALC control circuit and numerical-control attenuator, temperature sensing circuit before first cavity comprises, single-chip microcomputer digital circuit and current detection circuit and ouput power detection circuit and backward power testing circuit; Second cavity is for being third level rate power amplifier tube; The 3rd cavity is final stage master power amplifier.
The main process of the debugging of this power amplifier is: at first by to grid voltage settings at different levels, power tube is worked on its best operating point, finely tune the position of matching capacitance then, can obtain radio-frequency (RF) index preferably substantially.Can effectively compensate grid voltage and gain by software in high low temperature in addition, feasible linear, indexs such as gain keep state preferably in the total temperature scope.
Though the utility model is described with reference to current better embodiment; but those skilled in the art will be appreciated that; above-mentioned better embodiment only is used for illustrating the utility model; be not to be used for limiting protection range of the present utility model; any within spirit of the present utility model and principle scope; any modification of being done, equivalence replacement, improvement etc. all should be included within the rights protection scope of the present utility model.
Claims (8)
1. linear power amplifying device, comprise two big functional circuits: radio frequency amplifying circuit, detect and control circuit, it is characterized in that, described radio frequency amplifying circuit comprises first power amplifier of polyphone successively, temperature compensation resistance, second power amplifier, numerical-control attenuator, the 3rd power amplifier, the 4th power amplifier and circulator, radio frequency amplifying circuit carries out linear amplification by four power amplifiers with the radiofrequency signal of input, numerical-control attenuator adds the numerical control decay simultaneously, thereby cooperates complete machine need adjust gain; Described detection and control circuit comprise detecting circuit and have the ALC control loop of the first amplifier valve composition of automatic gain control function, control with the peak power output to entire circuit; Respectively with the ouput power detection circuit and the reflection power testing circuit of circulator input and inverse output terminal coupling, so that power output and reflection power are detected.
2. linear power amplifying device as claimed in claim 1, it is characterized in that, described ouput power detection circuit comprises single-chip microcomputer, amplifier tube, detection tube, the load resistance of polyphone successively, detection tube is to being coupled with the 4th power amplifier to circulator between the load resistance, obtain the output signal that is coupled by coupling, draw one group by detection tube and change one group of magnitude of voltage of corresponding linearity with power output, amplify by amplifier tube then, single-chip microcomputer is sent in decoupling, realizes the accurate monitoring to power output.
3. linear power amplifying device as claimed in claim 1, it is characterized in that, described reflection power testing circuit comprises the single-chip microcomputer of polyphone successively, amplifier tube, the detection tube and first load resistance, circulator links to each other with second load resistance, be coupled between detection tube to the first load resistance and between circulator to the second load resistance, obtain the output signal that is coupled by coupling, draw one group by detection tube and change one group of magnitude of voltage of corresponding linearity with power output, amplify by amplifier tube then, single-chip microcomputer is sent in decoupling, realizes the accurate monitoring to output reflection power.
4. as claim 2 or 3 described linear power amplifying devices, it is characterized in that, the voltage that comes out from described detection tube amplifies through amplifier, by a comparator, adjust threshold voltage, when the power overrate then, the voltage of comparator surpasses threshold voltage, the comparator output level changes, and single-chip microcomputer cuts off grid voltage automatically, exports the merit alarm signal simultaneously; Or, in described single-chip microcomputer, use software setting to cross the merit thresholding, when single detection output power value was worth greater than threshold power, single-chip microcomputer cut off grid voltage automatically, exports the merit alarm signal simultaneously.
5. linear power amplifying device as claimed in claim 1, it is characterized in that, described detection and control circuit specifically comprise the shunt of polyphone successively, compare amplifying circuit, single-chip microcomputer, the resistance of a high-power little resistance of serial connection behind voltage input end, shunt is got its two ends pressure reduction, by handling, obtain the voltage output of a linear change, and then by comparing amplifying circuit adjustment multiplication factor adjustment output valve, deliver to single-chip microcomputer after the decoupling, in single-chip microcomputer, pass through thresholding of software setting, when bringing voltage above this thresholding, the supply of cutting off grid voltage falls in single-chip microcomputer, sends alarm signal simultaneously.
6. linear power amplifying device as claimed in claim 1, it is characterized in that, described detection and control circuit comprise that specifically the single-chip microcomputer of contacting successively, digital-to-analogue transform chip, amplifier, power tube grid, single-chip microcomputer is provided with output grid voltage value, single-chip microcomputer output transforms the different voltage of chip output by a digital-to-analogue amplifies it by a certain percentage through an amplifier, delivers to the grid of power tube.
7. linear power amplifying device as claimed in claim 1, it is characterized in that, described detection and control circuit specifically comprise temperature sensor, amplifier, single-chip microcomputer successively, temperature sensor detects the temperature of the 4th power amplifier, and be converted to the voltage that output voltage obtains one group of linearity corresponding with temperature, amplify by amplifier then, deliver to the chip microcontroller monitoring at last.
8. as claim 2 or 3 described linear power amplifying devices, it is characterized in that, described ALC control loop comprises the relatively amplification voltage stabilizing circuit that links to each other with amplifier tube, described detection tube links to each other with a load resistance, detection tube is to being coupled with the 4th power amplifier to circulator between the load resistance, obtain the output signal that is coupled by coupling, with ouput power detection circuit resulting with the corresponding magnitude of voltage of power output through one group of amplification, deliver to the control voltage discrepancy pin of amplifier tube then, thereby realize control to power output, when power output exceeds preset value than rated power, to detect magnitude of voltage this raised area of decaying according to power output in amplifier tube inside, thereby the power output that guarantees power amplifier keeps the power-handling capability of design.
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| CNU2006200152912U CN201015188Y (en) | 2006-10-18 | 2006-10-18 | Linear power amplifier device |
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| CNU2006200152912U CN201015188Y (en) | 2006-10-18 | 2006-10-18 | Linear power amplifier device |
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| CN102332874A (en) * | 2011-07-21 | 2012-01-25 | 武汉虹信通信技术有限责任公司 | Temperature compensation device for power amplifier and method for controlling power stability |
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| CN102332874A (en) * | 2011-07-21 | 2012-01-25 | 武汉虹信通信技术有限责任公司 | Temperature compensation device for power amplifier and method for controlling power stability |
| CN103138685B (en) * | 2011-11-28 | 2015-06-10 | 中国科学院上海微系统与信息技术研究所 | Orthogonal frequency division multiplexing (OFDM) self-adaption feedforward linear power amplifying device |
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