CN102064774A - Implementation method of power amplifying circuit and power amplifying device - Google Patents
Implementation method of power amplifying circuit and power amplifying device Download PDFInfo
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- CN102064774A CN102064774A CN2009102233698A CN200910223369A CN102064774A CN 102064774 A CN102064774 A CN 102064774A CN 2009102233698 A CN2009102233698 A CN 2009102233698A CN 200910223369 A CN200910223369 A CN 200910223369A CN 102064774 A CN102064774 A CN 102064774A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0288—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
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Abstract
The invention discloses an implementation method of a power amplifying circuit and a power amplifying device. The device comprises a primary amplifying path and an auxiliary amplifying path, wherein the auxiliary amplifying path comprises a circuit control module and an auxiliary amplifying module; the circuit control module is used for detecting the level of an input signal of the auxiliary amplifying path, generating a control level used for controlling the input power of the auxiliary amplifying path according to the level of the input signal and controlling the auxiliary amplifying patch to operate at a corresponding input power by virtue of the control level; and the auxiliary amplifying module is used for amplifying the power of the input signal. The input power of the auxiliary amplifying path is controlled to control the working condition thereof, thus not only avoiding that different amplifiers are inconsistent at the same voltage as a bias voltage is set, but also achieving high-efficiency power amplification of a transmission signal and obtaining higher controllability and selectivity.
Description
Technical field
The present invention relates to communication technical field, refer to a kind of power amplification circuit implementation method and power amplifier device that is applicable to radio frequency and microwave frequency band especially.
Background technology
Along with in the communication technical field to the improving constantly of the requirement of aspects such as energy consumption and environmental protection, the efficient of signal transmission is more and more paid close attention to.And the power consumption major part of communication system all comes from power amplifier, and the efficient of power amplifier has directly influenced overall system efficiency and power consumption, and therefore, the efficient that improves power amplifier becomes the key issue of the effectiveness that improves communication system.In the practical application because the restriction of modulation system, make system signal have peak-to-average force ratio, the measure of therefore general employing back-off guarantees the linearity output of signal, no matter is to be operated in category-B, C class state, and back-off all must be accompanied by the reduction of efficient in the single tube scheme.
At present, generally adopt the Doherty technology to improve power amplification circuit efficient.Typical power amplification circuit comprises main path and the auxiliary path that amplifies of amplifying as shown in Figure 1.Wherein, the main amplification in the path comprises: main amplifier 100, matching network 101, phase-shift network 102, phase-shift network 103; The auxiliary amplification in the path comprises: phase-shift network 104, booster amplifier 105, matching network 106, phase-shift network 107.This power amplification circuit also comprises and the main phase-shift network 108 that amplifies path, assists the amplification path all to be connected.
When signal passes through this amplifying circuit, can be divided into two-way, one the tunnel enters the main path that amplifies, amplify through main amplifier 100, one the tunnel enters the auxiliary path that amplifies amplifies through booster amplifier 105, bias voltage by control two-way amplifier makes main amplifier 100 be operated in category-B or AB class, and booster amplifier is operated in the C class.Because the bias voltage of C class operating state is lower, makes it can not be in conducting state all the time, but just conducting when input signal is enough big.Therefore, when input signal was big, the main path that amplifies was worked simultaneously with the auxiliary path that amplifies, and realizes the normal power amplification of input signal.When input signal was smaller, the auxiliary booster amplifier that amplifies path then was in not conducting state, had only the main closed-circuit working that amplifies.At this moment, can bring out the load variations of carrier amplifier, the Z0 (load impedance of power amplifier root) of the load that realizes main amplifier 100 by the auxiliary open circuit that amplifies path when high-power brought up to 2*Z0 accordingly, with respect to two above-mentioned single tube schemes of the equal connected sum of path, when the signal of output equal-wattage, reached the purpose that improves output signal phase efficient.
Owing among Fig. 1 in order to realize matching network 101 that phase matched is provided with and 106 existence, make when realizing that Z0 brought up to this impedance conversion of 2*Z0, need to add some phase-shift networks and realize adjustment impedance.For example among Fig. 1, phase-shift network 102,104,107 all is to use the phase-shift network of microstrip line realization; Phase-shift network 103 is that λ/4 line impedences are the phase-shift network of Zload, and its effect is to make the load impedance of signal output become 2*Zload by Zload; Phase-shift network 108 is that λ/4 line impedences are
Phase-shift network, its effect is to make the load impedance of signal output become 1/2*Zload by Zload; The effect of phase-shift network 102 are auxiliary matched networks 101 with load impedance by Z0 be tuned to 2*Z0.The adding of phase-shift network 107 be for make booster amplifier 105 do not have signal by the time can be in desirable open-circuit condition; Phase-shift network 102,103 all is in order to adjust the main load impedance that amplifies path, phase-shift network 104,107 all is in order to adjust the auxiliary load impedance that amplifies path, phase-shift network 108 be for adjust through main amplify path and amplify after, or through main path and the auxiliary load impedance that amplifies the signal after path amplifies of amplifying.
Because the complexity of phase-shift network makes very difficult in practice two-way phase place up and down adjust balance, some improved ways therefore also occurred.
Application number is the patent application of CN200610058164, discloses a kind of power amplification circuit as shown in Figure 2.Its main amplification in the path comprises: main amplifier 200, matching network 201, phase-shift network 202 phase-shift networks 203; The auxiliary amplification in the path comprises: phasing unit 204, amplitude adjustment unit 205, phase-shift network 206, booster amplifier 207, matching network 208, phase-shift network 209, detecting circuit 210.This power amplification circuit also comprises and the main phase-shift network 211 that amplifies path, assists the amplification path all to be connected.
Wherein, carry out detection by 210 pairs of input signals of detecting circuit, then according to the main amplifier under identical incoming signal level that comes out in advance and the phase place and the amplitude difference of booster amplifier, utilize the phase place and the amplitude on phasing unit 204 and 205 pairs of booster amplifier roads of amplitude adjustment unit to adjust, realize effectively, adjust constantly.But the characteristic of each power tube (amplifier) and inconsistent, it is very unrealistic adding up respectively at the different power tubes of each characteristic, it is not good that the power tube that is used for other of the statistics of some power tubes also can be caused adjusting effect yet.
The international patent application of application number WO03065599 discloses a kind of power amplification circuit as shown in Figure 3.Its main amplification in the path comprises: main amplifier 300, matching network 301, phase-shift network 302, phase-shift network 303; The auxiliary amplification in the path comprises: phase-shift network 304, booster amplifier 305, matching network 306, phase-shift network 307, detecting circuit 308, digital control circuit 309 and bias network 310.This power amplification circuit also comprises and the main phase-shift network 311 that amplifies path, assists the amplification path all to be connected.
Utilize detecting circuit 308 to detect the level height of input signal, control the bias voltage of power tube according to the height of level by digital control circuit 309, realize that by bias network 310 adjustment of bias voltage changes then, thereby power tube is adjusted to suitable operating state, to take into account linearity and efficient, but it still realizes operating state adjustment by adjusting bigoted voltage, and effect is not very good.
In the above-mentioned prior art, no matter be the direct adjusting main amplifier (carrier amplifier) of Fig. 1 and the bias voltage of booster amplifier (peak amplifier), make two amplifiers be operated in different operating states: when signal is less, peak amplifier is in nonconducting state, the carrier amplifier individual output power, thereby bring out the load variations of carrier amplifier, improve the efficient of carrier amplifier this moment.Still the bigoted voltage of control after the detection of Fig. 3 all is to control auxiliary break-make of amplifying path by the change of bigoted voltage, with the way of raising the efficiency.And the adjustment of bigoted voltage must have influence on the amplification effect and the efficiency of transmission of whole amplifying circuit, and the selection of its voltage bias value and adjusting are all more difficult, must be very careful; And after bias voltage was provided with, the difference of power tube characteristic also can influence the consistency of whole amplifying circuit, thereby influenced effect that signal amplifies characteristics of signals such as (for example) linearities and efficient.Therefore, it is not very good to realize that by bias voltage the power of amplifying circuit improves its effect.
Summary of the invention
The embodiment of the invention provides a kind of power amplification circuit implementation method and power amplifier device, must rely on bias voltage that power amplifier is controlled in order to solve in the prior art, causes the signal amplification effect undesirable, the problem that efficiency of transmission is not easy to guarantee.
A kind of power amplifier device comprises parallel main path and the auxiliary path that amplifies of amplifying, and is used for input signal is carried out power amplification; Comprise in the described auxiliary amplification path: circuit control module and auxiliary amplification module;
Described circuit control module, be used to detect the level of described auxiliary amplification path input signal, level height according to input signal, generate a control level that is used to control described auxiliary amplification path input power, control described auxiliary amplification path by described control level and under the input power of correspondence, work;
Described auxiliary amplification module is used for described input signal is carried out power amplification.
A kind of power amplification circuit implementation method, the main path that amplifies carries out power amplification to input signal, comprising:
Input and the described main level that amplifies the input signal of the parallel auxiliary amplification path of path are detected;
According to the level of detected described input signal height, generate a control level that is used to control the input power of described auxiliary amplification path;
Control described auxiliary amplification path by described control level and under the input power of correspondence, described input signal is carried out power amplification.
Power amplification circuit implementation method and power amplifier device that the embodiment of the invention provides, by detecting the auxiliary level that amplifies the path input signal, level height according to input signal, generate a control level that is used to control described auxiliary amplification path input power, control described auxiliary amplification path by control level and under the input power of correspondence, work.By auxiliary real-time detection of amplifying path being realized according to the variation of input signal real-time adjustment and the auxiliary conducting state of amplifying path of control, and control auxiliary conducting situation of amplifying path by peripheral circuit, the situation that does not need to consider bias voltage be issued to traditional method in bias voltage power controlling amplifying circuit operating state is set, improve the identical purpose of delivery efficiency, and obtain better, higher efficiency of transmission.Thereby the inconsistency and the not high problem of power amplification circuit efficiency of transmission of different amplifiers under the identical bias voltage that bias voltage brings have been avoided being provided with.
Description of drawings
Fig. 1 is the schematic diagram of typical Doherty circuit in the prior art;
Fig. 2 is the schematic diagram of the power amplification circuit that phase amplitude is adjusted in the prior art;
Fig. 3 is the schematic diagram of the power amplification circuit that bias voltage is adjusted in real time in the prior art;
Fig. 4 is the structural representation of power amplifier device in the embodiment of the invention;
Fig. 5 is the flow chart of power amplification circuit implementation method in the embodiment of the invention;
Fig. 6 is the structural representation of power amplifier device in the embodiment of the invention one;
Fig. 7 is a kind of concrete structure schematic diagram of power amplifier device in the embodiment of the invention one;
Fig. 8 is the another kind of structural representation of power amplifier device in the embodiment of the invention one;
Fig. 9 is the structural representation of power amplifier device in the embodiment of the invention two.
Embodiment
The power amplifier device that the embodiment of the invention provides, add the gate-controlled switch circuit in the path auxiliary the amplification, realize assisting the adjustment of amplification closed-circuit working state by the auxiliary input power of amplifying path of gate-controlled switch circuit regulating and controlling, its structure as shown in Figure 4, comprise main path 10 and the auxiliary path 20 that amplifies of amplifying, two amplification paths are parallel, are used for input signal is carried out power amplification.Wherein, the auxiliary path 20 that amplifies comprises: circuit control module 21 and auxiliary amplification module 22.
Preferable, foregoing circuit control module 21 specifically can comprise: detecting unit 23, control unit 24 and switch element 25.The function that each unit is realized is as follows:
Detecting unit 23 is used to detect the auxiliary level that amplifies path 20 input signals.
The above-mentioned power amplifier device that provides by the embodiment of the invention is realized the power amplification circuit implementation method that transmitted signal power is amplified, its flow process as shown in Figure 5, execution in step is as follows:
Step S501: detect to importing the auxiliary level that amplifies the input signal of path.
By power-sensing circuit the auxiliary incoming signal level that amplifies path is detected; Or by the digital power testing circuit the auxiliary input signal power that amplifies path is detected, obtain the level value of corresponding digital signal form according to the power of input signal.
Step S502:, generate one and be used to control auxiliary control level of amplifying the input power of path according to the level height of detected described input signal.
After detecting the level of input signal by power-sensing circuit, generate control level by control unit, specifically can: to the adjustment that decays of the level of the detected input signal of power-sensing circuit, and generate control level according to the adjusted incoming signal level of decay by controllable attenuator by driving amplifier.
After detecting the level value of input signal by the digital power testing circuit, generate control level by control unit, specifically can: the pad value of determining the level of the detected input signal of power-sensing circuit, adjust the level value of input signal according to pad value by controllable attenuator, send digital-to-analogue converter DAC to, the adjusted level value of digital signal form is converted into the control level of analog signal form by digital-to-analogue converter DAC.
Step S503: under the input power of correspondence, input signal is carried out power amplification by the auxiliary path that amplifies of control level control.
But, realize making the auxiliary booster amplifier that amplifies in the path under the input power of correspondence, to work by the auxiliary operating state of the switching circuit that is provided with in the path or the attenuation state of controlling attenuation link of amplifying of control level control.
Preferable, said method can also carry out load impedance coupling and phase place adjustment to main main amplifier and the auxiliary input signal that amplifies the booster amplifier in the path that amplifies in the path by matching network and phase-shift network.
Embodiment one:
The power amplifier device that the embodiment of the invention one is provided detects the level of input signal by power-sensing circuit, by the gate-controlled switch circuit auxiliary input power of amplifying path is controlled, and its concrete structure can be as shown in Figure 6.
The main path that amplifies specifically comprises main amplifier 400, matching network 401, phase-shift network 402 and 403.Wherein, main amplifier 400 can be a carrier amplifier.Matching network and phase-shift network are provided with according to the adjustment demand, are not limited to above-mentioned set-up mode, are used for the input signal of main amplifier is carried out load impedance coupling and phase place adjustment.
In the circuit control module of auxiliary amplification path, detecting unit is specially power-sensing circuit 404, is used for by the power detection of input signal being obtained the level of input signal; Control unit comprises controllable attenuator (but controlling attenuation link) 405 and driving amplifier 406, controllable attenuator 405, be used for to the level of the detected input signal of power-sensing circuit decay adjust after, send driving amplifier 406 to; Driving amplifier 406 is used for generating control level according to the adjusted incoming signal level of decay; Switch element is specially gate-controlled switch circuit 407, is used for the control downward modulation full employment state in control level, realizes the auxiliary purpose of amplifying the path input power of control.
The auxiliary auxiliary amplification module that amplifies path specifically comprises phase-shift network 408, booster amplifier 409, matching network 410 and phase-shift network 411.Wherein, booster amplifier 409 can be the detection peak amplifier; Matching network and phase-shift network are provided with according to the adjustment demand, are not limited to above-mentioned set-up mode, and the input signal that is used for booster amplifier carries out load impedance coupling and phase place adjustment.
Preferable, said apparatus also comprises phase-shift network 412, is used for the main signal that amplifies path and the output of auxiliary amplification path is carried out the phase place adjustment.
When using, at first the power by 404 pairs of input signals of power-sensing circuit detects to obtain corresponding level value, the level of 405 pairs of power-sensing circuit 404 detected input signals of the controllable attenuator adjustment that decays then, to adapt to the voltage request of driving amplifier 406, then driving amplifier is produced a control level according to adjusted level, and pass through the unlatching closure state that this control level is controlled gate-controlled switch circuit 407, realize the connection or the open circuit of the auxiliary amplification of control path.
When detecting input signal less (incoming signal level is lower), be in off-state by the auxiliary gate-controlled switch circuit that amplifies in the path of input power control, at input signal hour, main amplifier at this moment the booster amplifier less with respect to input signal is open circuit, and auxiliary amplification path is in the state of not conducting.The adding of the phase-shift network 411 of coupling link 410 back then is in order to assist the amplification path to adjust to desirable open-circuit condition.Simultaneously, amplifying the phase-shift network 402 and λ/4 line impedences that are provided with in the path by the master is the phase-shift network 403 of Zload, the load impedance of realizing the main amplifier root is risen to 2*Z0 (with respect to load Zload), amplify output thereby the load by auxiliary open circuit that amplifies path and main amplifier promotes the high efficiency that realizes the small-signal input.
When detecting input signal big (incoming signal level is than higher), adjust the value of input power according to the height of level, the connected state of control gate-controlled switch circuit is realized the control of amplifying the conducting state of path to auxiliary.Generally can determine that it still is less signal that input signal belongs to bigger signal by setting threshold.At this moment, the main path that amplifies amplifies the common power amplification that realizes input signal of path with assisting, and realizes high efficiency output.
Above-mentioned phase-shift network can be realized by microstrip line.
The above-mentioned power amplifier device of the embodiment of the invention one, its gate-controlled switch circuit is selected radio-frequency (RF) switch for use, and concrete structure is as shown in Figure 7.
The main path that amplifies specifically comprises main amplifier 500, matching network 501, phase-shift network 502 and 503.
In the circuit control module of auxiliary amplification path, detecting unit is specially power-sensing circuit 504, and control unit comprises controllable attenuator (but controlling attenuation link) 505 and driving amplifier 506, and switch element is specially radio-frequency (RF) switch 507.
The auxiliary auxiliary amplification module that amplifies path specifically comprises phase-shift network 508, booster amplifier 509, matching network 510 and phase-shift network 511.
Said apparatus also comprises and is used for the main signal that amplifies path and the output of auxiliary amplification path is carried out the phase-shift network 512 that phase place is adjusted.
Signal level is adjusted to and the corresponding control level of incoming signal level size through controllable attenuator 505 and driving amplifier 506 by power-sensing circuit 504, sent to radio-frequency (RF) switch 507.Radio-frequency (RF) switch 507 hour is closed in signal level, with booster amplifier 509 open circuits.511 of phase-shift networks play with auxiliary amplify path be tuned to the effect of desirable open circuit.This moment since phase-shift network 502 and 503 existence the load impedance of main amplifier 500 is promoted, thereby improved the efficiency of transmission of small-signal by this power amplifier device.Radio-frequency (RF) switch 507 hour is in conducting state in signal level, jointly input signal is carried out power amplification by booster amplifier 500 and main amplifier 509, realizes the high power output of the large-signal of high level, has improved signal power and has amplified and efficiency of transmission.
The above-mentioned power amplifier device of the embodiment of the invention one, its gate-controlled switch circuit is selected small signal amplifier or driving stage amplifier for use, and concrete structure is as shown in Figure 8.
The main path that amplifies specifically comprises main amplifier 600, matching network 601, phase- shift network 602 and 603.
In the circuit control module of auxiliary amplification path, detecting unit is specially power-sensing circuit 604, control unit comprises controllable attenuator (but controlling attenuation link) 605 and driving amplifier 606, and switch element is specially small signal amplifier or driving stage amplifier 607.
The auxiliary auxiliary amplification module that amplifies path specifically comprises phase-shift network 608, booster amplifier 609, matching network 610 and phase-shift network 611.
Said apparatus also comprises and is used for the main signal that amplifies path and the output of auxiliary amplification path is carried out the phase-shift network 612 that phase place is adjusted.
Signal level is adjusted to and the corresponding control level of incoming signal level size through controllable attenuator 605 and driving amplifier 606 by power-sensing circuit 604.Small signal amplifier or driving stage amplifier 607 are realized under the control of control level: hour close in signal level, with booster amplifier 509 open circuits.611 of phase-shift networks play with auxiliary amplify path be tuned to the effect of desirable open circuit.This moment since phase- shift network 602 and 603 existence the load impedance of main amplifier 600 is promoted, thereby improved the efficiency of transmission of small-signal by this power amplifier device; When signal level is big, be in conducting state, and be not in various degree conducting state together according to control level, jointly input signal is carried out power amplification by booster amplifier 600 and main amplifier 609, realize the high power output of the large-signal of high level, improved signal power and amplified and efficiency of transmission.
Embodiment two:
The power amplifier device that the embodiment of the invention two provides, different with embodiment one is, detect the level of input signal by the digital power testing circuit, and by attenuator and the controlled level of digital to analog converter, but by the auxiliary break-make of amplifying path of controlling attenuation controlling links, its structure comprises as shown in Figure 9:
The main path that amplifies specifically comprises main amplifier 700, matching network 701, phase-shift network 702 and 703.Wherein, main amplifier 700 can be a carrier amplifier.
In the circuit control module of auxiliary amplification path:
Detecting unit is specially digital power testing circuit 704, be used for by the power detection of input signal being obtained the auxiliary level value that amplifies the input signal of path, and the pad value of the level of the detected input signal of definite power-sensing circuit, send to controllable attenuator 705 with the form of digital signal.
Control unit comprises controllable attenuator (but controlling attenuation link) 705 and digital-to-analogue converter DAC706, and controllable attenuator 705 is used for the level value according to pad value adjustment input signal, sends digital-to-analogue converter DAC706 to; Digital-to-analogue converter DAC706 is used for adjusted incoming signal level value is converted into the control level of analog signal form.
But switch element is specially controlling attenuation link 707, is used for adjusting attenuation state under the control of control level, realizes the auxiliary purpose of amplifying the input power of path of control.
The auxiliary auxiliary amplification module that amplifies path specifically comprises phase-shift network 708, booster amplifier 709, matching network 710 and phase-shift network 711.
Preferable, said apparatus also comprises phase-shift network 712, is used for the main signal that amplifies path and the output of auxiliary amplification path is carried out the phase place adjustment.
In the practical application, the level of 704 pairs of input signals of digital power testing circuit detects, and through tabling look-up and determine the pad value of controllable attenuator 705, after controllable attenuator 705 attenuation processing, by crossing DAC706 signal level is adjusted to certain control level, go to control the attenuation of controllable attenuator 707.When incoming signal level hour, controllable attenuator 707 depth attenuations, be equivalent to booster amplifier 709 open circuit (the very for a short time open circuit that is equivalent to of signal), promptly this moment, booster amplifier 709 relative main amplifiers 700 were open circuit, and have phase-shift network 711 with booster amplifier be tuned to desirable the open circuit.Phase- shift network 702 and 703 existence promote the load impedance of main amplifier 700, thereby have improved the efficiency of transmission of small-signal by this power amplifier device; When incoming signal level is big, according to varying in size of incoming signal level, the decay by a small margin of controllable attenuator 707 or unattenuated, by booster amplifier 709 and the main amplifier 700 common power amplifications that realize input signal, realize the high power of the giving a signal output of high level, improved signal power and amplified and efficiency of transmission.
Preferable, the power amplifier that the foregoing description two is provided, can calculate the form of the impedance variation of a correspondence according to input power, the impedance variation process of control main amplifier 700, what make main amplifier can keep long high efficiency at 2*Z0 to the value of selecting load impedance between the Z0 along with the variation of input power arbitrarily.
In the foregoing description two, detect the link detecting incoming signal level by digital power, and the gate-controlled switch circuit is arranged to controllable attenuator, realize the input of any input power, conducting or half conducting state at any efficient point control booster amplifier reach good efficiency output.
Above-mentioned power amplifier device can allow booster amplifier to select higher job category (for example being not limited to the C class), even can be operated under the identical bias voltage with main amplifier, be the AB class, thereby keeping well realizing high efficiency transmission in the linearity.
Above-mentioned power amplification circuit implementation method and power amplifier device that the embodiment of the invention provides, signal magnitude by detection peak amplifier (being booster amplifier) circuit, control the input power of peak amplifier, adjust its power output, but and by gate-controlled switch circuit or the auxiliary break-make of amplifying path of controlling attenuation controlling links, can be according to the variation of input signal, the input power of real-time adjustment booster amplifier, accordingly, its power output and the main load impedance that amplifies path also can change thereupon, reach the purpose that changes the operating state of real-time power controlling amplifying device according to input signal, make signal hour, peak amplifier can switch to the state that does not have input power timely, realizes that carrier amplifier works independently, thus the load variations of bringing out carrier amplifier.When signal was big, peak amplifier can switch to suitable input power timely, and the main path that amplifies is worked simultaneously with the auxiliary path that amplifies.Thereby realize and the similar impedance variation of traditional Doherty that improve the efficient of power amplification circuit, realization is to the high-power amplification of the high efficiency of signal not needing to control under the situation of bias voltage.Avoided the traditional Doherty circuit of picture to make two amplifiers be operated in different operating states, the not high problem of power amplification circuit efficient that causes by regulating the bias voltage of carrier amplifier (being main amplifier) and peak amplifier.
Traditional Doherty circuit, when realizing power amplifier because the inconsistency of power tube, the bias voltage that it is fixing the efficient that has influenced whole link is set.Compare with traditional Doherty circuit, the application's above-mentioned power amplifier device is not in the adjusting of the bias voltage of strong dependence booster amplifier, auxiliary break-make of amplifying path no longer includes requirement to bias voltage, therefore, auxiliary break-make of amplifying path is no longer dependent on the amplification characteristic of power tube self, is free to select the conducting power points of peak amplifier to raise the efficiency.Thereby evade the auxiliary nonuniformity of amplifier tube under same bias voltage effectively, improve consistency of product.
Because influencing the circuit turn-on characteristic no longer is bias voltage, therefore, can allow to select bias voltage value suitable, that efficient is higher among the application.Both bias voltage can be arranged to the bias voltage set-point of the booster amplifier of traditional Doherty requirement, also bias voltage can be improved, even can bring up to the bias voltage identical, thereby can obtain better, higher efficiency of transmission with main amplifier.
Above-mentioned power amplifier device is by the switch of peripheral link, reached with traditional Doherty to change the identical purpose of power amplifier characteristic by being provided with of bias voltage, and obtained better power amplifier effect; Because peripheral link is better controlled, and makes this mode have better controllability.
Preferable, when using the link of can decaying to substitute the gate-controlled switch circuit to realize, can realize the power output of real-time, continuous adjusting booster amplifier to auxiliary break-make control of amplifying path, promoted the linearity of output signal when raising the efficiency.
The above; 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 present invention discloses; the variation that can expect easily, replace or be applied to other similar devices, 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 claims.
Claims (12)
1. a power amplifier device comprises parallel main path and the auxiliary path that amplifies of amplifying, and is used for input signal is carried out power amplification; It is characterized in that, comprise in the described auxiliary amplification path: circuit control module and auxiliary amplification module;
Described circuit control module, be used to detect the level of described auxiliary amplification path input signal, level height according to input signal, generate a control level that is used to control described auxiliary amplification path input power, control described auxiliary amplification path by described control level and under the input power of correspondence, work;
Described auxiliary amplification module is used for described input signal is carried out power amplification.
2. device as claimed in claim 1 is characterized in that, described circuit control module specifically comprises:
Detecting unit is used to detect the level of described auxiliary amplification path input signal;
Control unit is used for the level height according to input signal, generates a control level that is used to control described auxiliary amplification path input power;
Switch element is used for controlling described auxiliary amplification path by described control level and works under the input power of correspondence.
3. device as claimed in claim 2 is characterized in that described detecting unit is specially power-sensing circuit, is used for by the power detection of input signal being obtained the level of described input signal;
Described control unit comprises: controllable attenuator, be used for to the level of the detected input signal of described power-sensing circuit decay adjust after, send driving amplifier to; With described driving amplifier, be used for generating described control level according to the adjusted incoming signal level of decay;
Described switch element is specially the gate-controlled switch circuit, is used for the control downward modulation full employment state in described control level, realizes the described auxiliary amplification path input power of control.
4. device as claimed in claim 3 is characterized in that, described gate-controlled switch circuit is selected one of following elements for use: radio-frequency (RF) switch, small signal amplifier and driving stage amplifier.
5. device as claimed in claim 2, it is characterized in that, described detecting unit is specially the digital power testing circuit, be used for by the power detection of input signal being obtained the level value of described input signal, and determine the pad value of the level of the detected input signal of described power-sensing circuit, send to described control unit with the form of digital signal;
Described control unit comprises: controllable attenuator, be used for adjusting the level value of described input signal according to described pad value, and send digital-to-analogue converter DAC to; With described digital-to-analogue converter DAC, be used for the level value of adjusted described input signal is converted into the control level of analog signal form;
But described switch element is specially the controlling attenuation link, is used for adjusting attenuation state under the control of described control level, realizes the input power of the described auxiliary amplification path of control.
6. as the arbitrary described device of claim 1-5, it is characterized in that the described main path that amplifies specifically comprises main amplifier, matching network and phase-shift network;
Described matching network and phase-shift network are used for the input signal of described main amplifier is carried out load impedance coupling and phase place adjustment.
7. as the arbitrary described device of claim 1-5, it is characterized in that described auxiliary amplification module specifically comprises: booster amplifier, matching network and phase-shift network;
Described matching network and phase-shift network are used for the input signal of described booster amplifier is carried out load impedance coupling and phase place adjustment.
8. a power amplification circuit implementation method is led the amplification path input signal is carried out power amplification, it is characterized in that, comprising:
Input and the described main level that amplifies the input signal of the parallel auxiliary amplification path of path are detected;
According to the level of detected described input signal height, generate a control level that is used to control the input power of described auxiliary amplification path;
Control described auxiliary amplification path by described control level and under the input power of correspondence, described input signal is carried out power amplification.
9. method as claimed in claim 8 is characterized in that, detects by the incoming signal level of power-sensing circuit to described auxiliary amplification path;
Described level height according to detected described input signal generates a control level that is used to control the input power of described auxiliary amplification path, specifically comprises:
By controllable attenuator to the adjustment that decays of the level of the detected input signal of described power-sensing circuit; And by driving amplifier according to the decay adjusted incoming signal level generate described control level.
10. method as claimed in claim 8 is characterized in that, detects by the incoming signal level of digital power testing circuit to described auxiliary amplification path, obtains the level value of the digital signal form of described input signal;
Described level height according to detected described input signal generates a control level that is used to control the input power of described auxiliary amplification path, specifically comprises:
Determine the pad value of the level of the detected input signal of described power-sensing circuit;
Adjust the level value of described input signal by controllable attenuator according to described pad value, send digital-to-analogue converter DAC to;
The adjusted level value of described digital signal form is converted into the control level of analog signal form by digital-to-analogue converter DAC.
11., it is characterized in that as claim 9 or 10 described methods, describedly control described auxiliary amplification path by described control level and under the input power of correspondence, work, specifically comprise:
But control the operating state of the switching circuit that is provided with in the described auxiliary amplification path or the attenuation state of controlling attenuation link by described control level, realize described auxiliary amplification path is worked under the input power of correspondence.
12. method as claimed in claim 11, it is characterized in that, also comprise: amplify main amplifier in the path and the input signal of the booster amplifier in the described auxiliary amplification path carries out load impedance coupling and phase place adjustment to main by matching network and phase-shift network.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910223369 CN102064774B (en) | 2009-11-18 | 2009-11-18 | Implementation method of power amplifying circuit and power amplifying device |
| PCT/CN2010/078779 WO2011060706A1 (en) | 2009-11-18 | 2010-11-16 | Implementation method for power amplification circuit and power amplification apparatus |
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| CN 200910223369 CN102064774B (en) | 2009-11-18 | 2009-11-18 | Implementation method of power amplifying circuit and power amplifying device |
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Also Published As
| Publication number | Publication date |
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| WO2011060706A1 (en) | 2011-05-26 |
| CN102064774B (en) | 2013-11-06 |
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