CN103312278B - A kind of power control system for radio-frequency power amplifier - Google Patents
A kind of power control system for radio-frequency power amplifier Download PDFInfo
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- CN103312278B CN103312278B CN201310172789.4A CN201310172789A CN103312278B CN 103312278 B CN103312278 B CN 103312278B CN 201310172789 A CN201310172789 A CN 201310172789A CN 103312278 B CN103312278 B CN 103312278B
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Abstract
The present invention relates to power amplifier techniques, be specially a kind of power control system for radio-frequency power amplifier in conjunction with power combing and dynamic load.In Monolithic RF transceiver, power controls the numerically controlled power synthetic technique of normal employing, and when power amplifier is operated in non-peak power output level, its efficiency can reduce because equivalent load is not optimum load.Present system is by radio-frequency power synthesis unit, dynamic load unit and power control logic unit; Power control logic unit received power control signal thus control the combination of power amplifier of weighting, regulates dynamic load regulating circuit state by look-up table, thus power efficiency when effectively improving various power stage level.
Description
Technical field
The present invention relates to power amplifier techniques, be specifically related to a kind of power control system for radio-frequency power amplifier in conjunction with power combing and dynamic load.
Background technology
For handheld communication devices application, the energy consumption of radio-frequency power amplification system almost account for the 50% even higher of communication system total energy consumption, in order to extending battery life, needs the efficiency improving radio-frequency power amplifier as much as possible.The peak efficiencies of power amplifier, efficiency namely during Maximum Power Output generally can be higher, efficiency when under but the communication system most of the time is operated in lower power levels, therefore, improving radio-frequency power amplifier lower power levels thus to obtain high average efficiency most important.
Use and control the radio-frequency power amplifier that weighted power synthesis realizes power control, the optimum load value required when equivalent load is generally designed to maximum power output.When low-power exports, because supply voltage is fixed, and the output current of power amplifier is limited in one's ability, the optimum load value now required during its efficiency best equivalence duty ratio maximum power output is large, if do not make dynamic load regulation, output loading matching network is fixing, and now the efficiency of power amplifier can decline compared to maximum power power added efficiency, and the amplitude of decrease in efficiency even reaches an order of magnitude.
Fig. 1 is traditional Power Control functionality complex RF power amplifier system block diagram, in figure, the power amplifier of weighting is made up of X1, X2, X4 and X8, and the power output capacity of these four power amplifiers is binary weighting, and X2 is the twice of X1, X4 is the twice of X2, and X8 is the twice of X4.Microcontroller passes through four enable control end PA_CTL0, PA_CTL1, PA_CTL2, PA_CTL3 controls the radio-frequency power amplifier of corresponding weighting respectively, what these four enable control ends received is digital signal, can form the power stages of 16 kinds of combinations, thus reaches the object that power controls.Load matching network in figure is fixed, load impedance is equivalent to optimum impedance during power amplifier maximum power output, thus obtains the highest efficiency when maximum power output.
Fig. 2 is traditional power output of Power Control functionality complex RF power amplifier and the relation of efficiency.As can be seen from the figure, on larger power level, (in figure 211) power amplifier has higher efficiency; When power level declines (in figure 212), the efficiency of radio frequency amplifier sharply declines, and efficiency when minimum power exports is compared with efficiency during maximum power output, and the amplitude of decrease in efficiency even reaches an order of magnitude.
Summary of the invention
The invention provides a kind of power control system for radio-frequency power amplifier, its object is to the average efficiency improving power combing radio-frequency power amplifier.
A kind of power control system for radio-frequency power amplifier provided by the invention, comprise the radio-frequency power synthesis unit be made up of radio-frequency power amplifier X1, X2, X4, X8 of weighting, it is characterized in that, this system also comprises dynamic load unit and power control logic unit;
Described dynamic load unit is made up of dynamic load regulating circuit, for being changed the equivalent load impedance of power amplifier by the parameter of regulating load matching network, make under different power levels, the equivalent load impedance of each radio-frequency power amplifier in radio-frequency power synthesis unit is all approximately optimum load impedance;
Described power control logic unit parses target output value according to external power control signal, control the combination of the radio-frequency power amplifier of each weighting in radio-frequency power synthesis unit, dynamic load regulating circuit state is regulated, to improve power efficiency during various power stage level by look-up table.
As the improvement of technique scheme, described power control logic unit comprises look-up table, input control logic circuit, and dynamic load selects logical circuit, and weighted power control circuit; Look-up table for storing the assembled state of dynamic load unit under a series of power level, the corresponding a kind of power stage level of each assembled state; The binary code stream that microcontroller sends is decoded as corresponding performance number by input control logic circuit, finds corresponding load matching network configuration in a lookup table, and is supplied to dynamic load selection logical circuit; Also performance number is supplied to weighted power control circuit simultaneously; Dynamic load selects logical circuit by the load configuration under the power of correspondence that finds in look-up table, by the load matching network of the enable correspondence of enable control line of dynamic load unit, thus near-optimization load corresponding under obtaining this power level; Weighted power control circuit configures according to the radio-frequency power amplifier of the enable correspondence of the power level of correspondence, thus obtains corresponding power stage level.
As the further improvement of technique scheme, described dynamic load regulating circuit comprise the first to the tenth electric capacity C1, C2 ..., C10, inductance L and the first to the 8th K switch 1, K2 ..., K8, wherein, first to the tenth electric capacity C1, C2 ..., C10 capacitance meet binary weighting, output port connects load, and input port connects the power combing output point of each radio-frequency power amplifier; The two ends of inductance L are connected with input and output port respectively, electric capacity C1, C2, C3, C4 are all connected with described input port with one end of C5, the direct ground connection of the other end of electric capacity C1, the other end of electric capacity C2, C3, C4 and C5 is respectively by ground connection after connecting valve K1, K2, K3, K4; Electric capacity C6, C7, C8, C9 are all connected with output port with one end of C10, the direct ground connection of the other end of electric capacity C6, and the other end of electric capacity C7, C8, C9 and C10 is respectively by ground connection after connecting valve K5, K6, K7, K8.
In Monolithic RF transceiver, power controls the numerically controlled power synthetic technique of normal employing, and when power amplifier is operated in non-peak power output level, its efficiency can reduce because equivalent load is not optimum load.For this reason, the invention provides and a kind ofly equivalent load automatically can be regulated to make it close to the control method of optimum load according to power amplifier output power level, thus power efficiency when effectively improving various power stage level.Specifically, the present invention has following technical characterstic:
(1) power synthetic technique is being used to control, in the radio frequency power amplifier system of power output, to utilize numerically controlled dynamic load regulating circuit to improve power efficiency during low power output level.
(2) Power Amplifier Unit of digital control weighting is used to realize.
(3) digital control technology is used to change equivalent load according to power amplifier output power horizontal dynamic.
(4) realize by tabling look-up.
Accompanying drawing explanation
Fig. 1 is traditional Power Control functionality complex RF power amplifier system block diagram.
Fig. 2 is traditional power output of Power Control functionality complex RF power amplifier and the relation schematic diagram of efficiency.
Fig. 3 is the structured flowchart of power control system described in example of the present invention.
Fig. 4 is the structural representation of the dynamic load regulating circuit described in example of the present invention.
Fig. 5 uses the power amplifier output power of power control techniques of the present invention and the relation schematic diagram of efficiency.
Embodiment
Principle of the present invention is, the corresponding a kind of load matching network of a kind of power output, this corresponding relation stores in a lookup table.When selecting a kind of power output, corresponding matching network combination is found by look-up table, dynamic change equivalent load, makes power amplifier can obtain the equivalent load matching network of near optimal under all power output levels, thus effectively improves power amplifier average efficiency.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.It should be noted that at this, the explanation for these execution modes understands the present invention for helping, but does not form limitation of the invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Fig. 3 is the system block diagram of power control techniques of the present invention, is made up of radio-frequency power synthesis unit 1, dynamic load unit 2 and power control logic unit 3 three part.
Radio-frequency power synthesis unit 1 is made up of power amplifier X1, X2, X4, X8 of weighting, and these power amplifiers have different power stage grades, is binary weighting under normal circumstances.
Dynamic load unit 2 is made up of dynamic load regulating circuit, main function is exactly the equivalent load impedance being changed power amplifier by the parameter of regulating load matching network, make under different power levels, the equivalent load impedance of power amplifier is all approximately optimum load impedance.
Power control logic unit 3 receives look-up table configuration signal from microcontroller and power control signal.Microcontroller belongs to whole radio-frequency (RF) transmitter part, does not belong to power amplifier section.At initial phase, power control logic unit 3 utilizes the configuration of look-up table configuration signal based on the look-up table of SRAM, the assembled state of the dynamic load unit under a series of power level is stored in look-up table.When microcontroller needs the power stage level changing radio-frequency power amplifier, microcontroller is to power control logic unit transmitting power control signal, power control logic unit utilizes this signal resolution to go out target output value, and then control the combination of radio-frequency power amplifier of each weighting in radio-frequency power synthesis unit, regulate dynamic load regulating circuit state, to improve power efficiency during various power stage level.
The power control logic unit 3 that this example provides is by look-up table 31, input control logic circuit 32, and dynamic load selects logical circuit 33, and weighted power control circuit 34 4 part is formed.
Look-up table 31, based on existing SRAM technology, configures so that store different matching networks in different application scenarios.Look-up table 31 for storing the assembled state of dynamic load unit under a series of power level, the corresponding a kind of power stage level of each assembled state.
The binary code stream of input is decoded as corresponding performance number by input control logic circuit 32, according to the performance number of correspondence, finds corresponding load matching network configuration in look-up table 31, and is supplied to dynamic load selection logical circuit 33.
The binary code of input is decoded as corresponding performance number by input control logic circuit 32, and is supplied to weighted power control circuit 34.
Dynamic load selects logical circuit 33 by the load configuration under the power of correspondence that finds in look-up table, by the enable control line DL_CTL0 of dynamic load unit, DL_CTL1, DL_CTL2, the load matching network of the enable correspondence of DL_CTL3, thus near-optimization load corresponding under obtaining this power level.
Weighted power control circuit 34 configures according to the power amplifier of the enable correspondence of the power level of correspondence, thus obtains corresponding power stage level.By this configuration, radio-frequency power amplifier all has approximate optimal load matching when each power level exports, thus reaches the object of improved efficiency.Four enable control end PA_CTL0, PA_CTL1, PA_CTL2, PA_CTL3 control radio-frequency power amplifier X1, X2, X4 and X8 of corresponding weighting respectively.
Fig. 4 is a kind of implementation of dynamic load regulating circuit in the present invention, this circuit by the 1st to the tenth electric capacity C1, C2 ..., C10, inductance L and the 1st to the 8th K switch 1, K2 ..., K8 form, there is input and output port, wherein, the capacitance of usual each electric capacity meets binary weighting, such as C5=8xC2, C4=4xC2, C3=2xC2, C10=8xC7, C9=4xC7, C8=2xC7, output port connects load (as antenna), and input port connects the power combing output point of power amplifier.The two ends of inductance L are connected with input and output port respectively, and C1, C2, C3, C4 are all connected with input port with one end of C5, the direct ground connection of the other end of C1, and the other end of C2, C3, C4 and C5 is respectively by ground connection after connecting valve K1, K2, K3, K4; C6, C7, C8, C9 are all connected with output port with one end of C10, the direct ground connection of the other end of C6, and the other end of C7, C8, C9 and C10 is respectively by ground connection after connecting valve K5, K6, K7, K8.This network is a ∏ type matching network combining dynamic adjustments, dynamic adjustments is by electric capacity 8xC2 (C5), the 4xC2 (C4) of weighting, 2xC2 (C3), C2,8xC7 (C10), 4xC7 (C9), 2xC7 (C8), C7, and K1, K2 ..., K8 realize.The weighting of capacitance is generally binary weighting, the capacitance place in circuit that different on off states is corresponding different, thus obtains different equivalent input impedances, reaches the object that dynamic load regulates.
Dynamic load regulating circuit receives dynamic load and selects logical circuit 33 by enable control line DL_CTL0, DL_CTL1, DL_CTL2, the configuration status of dynamic load under the corresponding power level that DL_CTL3 sends, according to this state, closed or the cut-off switch K1 of dynamic load regulating circuit, K2 ..., K8, by the capacitance of different capabilities access matching network in.
The input of dynamic load regulating circuit meets radio-frequency power amplifier X1, X2, X4, the output of X8, radio-frequency power amplifier X1, X2, X4, the different enabled state of X8 need different load configuration just can reach the highest power efficiency, dynamic load regulating circuit is exactly radio-frequency power amplifier X1, X2, X4, the load of X8, the load characteristic of dynamic load regulating circuit by K switch 1, K2 ..., K8 Determines.
The output of dynamic load regulating circuit connects actual loading, and this actual loading can be antenna, also can be another matching network or filter network.
Fig. 5 uses the power amplifier output power of power control techniques of the present invention and the relation of efficiency, and comparison diagram 2 can be found out, when low-power output level, power control mode of the present invention is significantly improved in power efficiency.
The above is preferred embodiment of the present invention, but the present invention should not be confined to the content disclosed in this embodiment and accompanying drawing.The equivalence completed under not departing from spirit disclosed in this invention so every or amendment, all fall into the scope of protection of the invention.
Claims (2)
1. a power control system for radio-frequency power amplifier, comprises the radio-frequency power synthesis unit be made up of radio-frequency power amplifier X1, X2, X4, X8 of weighting, it is characterized in that, this system also comprises dynamic load unit and power control logic unit;
Described radio-frequency power synthesis unit adopts binary weighting, has different power stage grades;
Described dynamic load unit is made up of dynamic load regulating circuit, for being changed the equivalent load impedance of power amplifier by the parameter of regulating load matching network, make under different power levels, use and control the radio-frequency power amplifier that weighted power synthesis realizes power control, equivalent load impedance is all approximately optimum load impedance;
Described power control logic unit parses target output value according to external power control signal, control the combination of the radio-frequency power amplifier of each weighting in radio-frequency power synthesis unit, dynamic load regulating circuit state is regulated, to improve power efficiency during various power stage level by look-up table;
Described power control logic unit comprises look-up table, input control logic circuit, dynamic load selection logical circuit and weighted power control circuit; Look-up table for storing the assembled state of dynamic load unit under a series of power level, the corresponding a kind of power stage level of each assembled state; Input control logic circuit, by the performance number of outside input radio frequency signal, finds corresponding load matching network configuration in a lookup table, and is supplied to dynamic load selection logical circuit; Also performance number is supplied to weighted power control circuit simultaneously; Dynamic load selects logical circuit by the load configuration under the power of correspondence that finds in look-up table, by the load matching network of the enable correspondence of enable control line of dynamic load unit, thus near-optimization load corresponding under obtaining this power level; Weighted power control circuit configures according to the radio-frequency power amplifier of the enable correspondence of the power level of correspondence, thus obtains corresponding power stage level.
2. power control system for radio-frequency power amplifier according to claim 1, it is characterized in that, described dynamic load regulating circuit comprise the first to the tenth electric capacity C1, C2 ..., C10, inductance L and the first to the 8th K switch 1, K2 ..., K8, wherein, first to the tenth electric capacity C1, C2 ..., C10 capacitance meet binary weighting, output port connects load, and input port connects the power combing output point of each radio-frequency power amplifier; The two ends of inductance L are connected with input and output port respectively, electric capacity C1, C2, C3, C4 are all connected with described input port with one end of C5, the direct ground connection of the other end of electric capacity C1, the other end of electric capacity C2, C3, C4 and C5 is respectively by ground connection after connecting valve K1, K2, K3, K4; Electric capacity C6, C7, C8, C9 are all connected with output port with one end of C10, the direct ground connection of the other end of electric capacity C6, and the other end of electric capacity C7, C8, C9 and C10 is respectively by ground connection after connecting valve K5, K6, K7, K8.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105100343A (en) | 2015-07-14 | 2015-11-25 | 开曼群岛威睿电通股份有限公司 | Mobile phone and instrument control method and system using such method |
| CN104967460A (en) * | 2015-07-17 | 2015-10-07 | 开曼群岛威睿电通股份有限公司 | Cell phone device, radio frequency transceiver circuit and impedance adjustment device |
| WO2017166216A1 (en) * | 2016-03-31 | 2017-10-05 | 宽兆科技(深圳)有限公司 | Circuit capable of extending dynamic range of radio-frequency output power of 5.8 ghz frequency band |
| CN107300643A (en) * | 2016-04-15 | 2017-10-27 | 株洲中车时代电气股份有限公司 | A kind of vehicle traction system supply voltage mutant test device and method |
| CN218183313U (en) * | 2022-09-05 | 2022-12-30 | 深圳飞骧科技股份有限公司 | Power amplifier with reconfigurable matching network and communication equipment |
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| JP3664990B2 (en) * | 2001-04-25 | 2005-06-29 | 株式会社東芝 | High frequency circuit and communication system |
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| CN101262260A (en) * | 2008-03-28 | 2008-09-10 | 华中科技大学 | Variable gain power amplifier for multi-channel self-adapted matching network |
| CN101562425A (en) * | 2009-05-26 | 2009-10-21 | 惠州市正源微电子有限公司 | High-low power combining circuit for radio-frequency power amplifier |
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