CN114050792A - Novel broadband Doherty radio frequency power amplifier - Google Patents
Novel broadband Doherty radio frequency power amplifier Download PDFInfo
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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
- H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
- H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
- H03F1/07—Doherty-type amplifiers
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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
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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
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
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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
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Abstract
The invention relates to the technical field of electronics, and provides a novel broadband Doherty radio frequency power amplifier, which comprises: the power amplifier comprises a power distributor, an input matching network, a drive amplifying network, a differential signal conversion network, a main power amplifier network, an auxiliary power amplifier network and a folding power synthesis transformer network; the power divider is used for dividing power of an input signal and outputting a first orthogonal signal RF + and a second orthogonal signal RF-; the input matching network is respectively connected with the output end of the power divider, and the output end of the input matching network is connected with the drive amplifying network; the output end of the driving amplification network is connected with a differential signal conversion network; the output end of the differential signal conversion network is respectively connected with the main power amplifier network and the auxiliary power amplifier network; the main power amplifier network and the auxiliary power amplifier network are connected with the folding power synthesis transformer network. The Doherty power amplifier has the advantages of compact structure, smaller size, small insertion loss and wide frequency band.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a novel broadband Doherty radio frequency power amplifier.
Background
Modern wireless communication systems require that handheld wireless communication equipment can still maintain high-speed communication in the process of fast moving, and in order to fully utilize frequency spectrum resources and improve data transmission rate, the modern wireless communication systems adopt a signal modulation mode with a high peak-to-average power ratio (PAPR). The high peak-to-average ratio signal puts a strict requirement on the linearity of the radio frequency power amplifier, and in order to ensure undistorted transmission of the signal, the wireless communication system requires that the radio frequency power amplifier works far away from a power compression point P-1dB back off to ensure linear amplification of the rf signal. However, the conventional rf power amplifier is usually designed to have a fixed power supply voltage, the load impedance is optimized at the maximum output power, and the efficiency of power back-off is very low. In order to improve the efficiency of the rf power amplifier in power back-off, efficiency improvement techniques such as Envelope Tracking (ET), digital pre-distortion, Envelope Elimination and Restoration (EER), and Doherty are widely used in broadcast and base station equipment. The Doherty PA has a simple circuit topology, does not need an additional control circuit, is not limited by the bandwidth of the control circuit, is very easy to implement, is easy to combine with other efficiency improvement technologies, and is a very competitive technology.
The Doherty technology is based on load modulation of an output end, and the size of the output load is determined by the current ratio of the main power amplifier and the auxiliary power amplifier. As shown in fig. 1, the Doherty PA consists of two amplifiers and a quarter-wave line. The main power amplifier works in class AB, and the auxiliary power amplifier works in class C. In the low-power mode, only the main power amplifier works, and the load impedance of the output end is 2Zopt. When the output power of the main power amplifier is close to the saturation power, the efficiency of the main power amplifier reaches the secondAt a peak point, the Doherty PA enters a high-power mode, the auxiliary power amplifier is turned on, and the load impedance of the main power amplifier is controlled to be 2ZoptConversion to ZoptThe load impedance of the auxiliary power amplifier is converted from infinity to Zopt. The Doherty technology realizes load modulation through a quarter-wavelength transmission line arranged at the output end of a main power amplifier, and the quarter-wavelength transmission line in front of an auxiliary power amplifier is used for compensating the phase of a modulation signal so as to reduce the power synthesis loss. Ideally, the output power of the Doherty PA is increased by 6dB in the high power mode compared to the output power in the low power mode. However, the mobile end device is required to be compact in size, and the application of the power divider and the quarter-wavelength transmission line with large size in the Doherty power amplifier circuit structure is limited. However, with the development of the Doherty technology, power distribution circuits suitable for radio frequency/microwave monolithic integrated circuit processes and lumped parameter circuits for replacing quarter-wavelength transmission lines are gradually mature, and the application of the Doherty radio frequency power amplifier in a mobile terminal is increasingly widespread.
In practical applications, the difference between the main power amplifier and the auxiliary power amplifier must be considered when designing the Doherty PA. The input capacitance of the auxiliary power amplifier changes along with the input power, the input impedance changes accordingly, and the changed impedance causes nonlinearity. On the other hand, the auxiliary power amplifier output parasitic capacitance causes an undesirable load modulation behavior, which reduces the efficiency, linearity and bandwidth characteristics of the Doherty PA.
Disclosure of Invention
The present invention provides a novel wideband doherty rf power amplifier to solve the above technical problems.
The invention provides a novel broadband Doherty radio frequency power amplifier, comprising: the power amplifier comprises a power distributor, an input matching network, a drive amplifying network, a differential signal conversion network, a main power amplifier network, an auxiliary power amplifier network and a folding power synthesis transformer network;
the power divider is used for dividing power of an input signal and outputting a first orthogonal signal RF + and a second orthogonal signal RF-;
the input matching network is respectively connected with the output end of the power divider, and the output end of the input matching network is connected with the driving amplification network and is used for receiving the first orthogonal signal RF + and the second orthogonal signal RF-and matching the first orthogonal signal RF + and the second orthogonal signal RF-to the driving amplification network;
the output end of the driving amplification network is connected with the differential signal conversion network, and the driving amplification network is used for amplifying the first orthogonal signal RF + and the second orthogonal signal RF-and then inputting the amplified signals into the differential signal conversion network;
the output end of the differential signal conversion network is respectively connected with the main power amplifier network and the auxiliary power amplifier network, and is used for carrying out single-end to differential signal conversion on the amplified first orthogonal signal RF + and the amplified second orthogonal signal RF-and respectively inputting the converted signals into the main power amplifier network and the auxiliary power amplifier network;
the main power amplifier network and the auxiliary power amplifier network are connected with the folded power synthesis transformer network, and power synthesis and output are carried out through the folded power synthesis transformer network after power amplification is carried out through the main power amplifier network and the auxiliary power amplifier network.
Preferably, the folded power synthesis transformer comprises a three-layer metal structure, wherein the outermost metal structure is wound with a primary main power amplifier coil connected with the main power amplifier network, the innermost metal structure is wound with a primary auxiliary power amplifier coil connected with the auxiliary power amplifier network, the middle metal structure is wound with a secondary coil, one port of the secondary coil is used for connecting an antenna load, and a capacitor C is connected between two ports of the secondary coil in parallelP1。
Preferably, the power divider includes: a first capacitor C1A second capacitor C2And a first transformer.
Preferably, the input matching network includes: a first input matching network connected to one output of the power divider and a second input matching network connected to another output of the power divider; the first input matching network receives the first quadrature signal RF + and is matched to the driving amplification network, and the second input matching network receives the second quadrature signal RF-and is matched to the driving amplification network.
Preferably, the driving amplification network comprises: a first driver amplifier connected to the first input matching network, and a second driver amplifier connected to the second input matching network.
Preferably, the differential signal conversion network includes: a first transformer type balun connected to the first driver amplifier, and a second transformer type balun connected to the second driver amplifier.
Preferably, the main power amplifier network includes a first main power amplifier and a second main power amplifier, the input ends of the first main power amplifier and the second main power amplifier are connected to the first transformer type balun, the first transformer type balun receives the amplified first quadrature signal RF +, converts a differential signal and outputs a first differential signal to the first main power amplifier and the second main power amplifier, and the first main power amplifier and the second main power amplifier output an amplified second differential signal to the folding power combining transformer network.
Preferably, the auxiliary power amplifier network includes a first auxiliary power amplifier and a second auxiliary power amplifier, the input ends of the first auxiliary power amplifier and the second auxiliary power amplifier are connected to the second transformer type balun, the second transformer type balun receives the amplified second orthogonal signal RF-and then performs conversion of a differential signal and outputs a third differential signal to the first auxiliary power amplifier and the second auxiliary power amplifier, and the first auxiliary power amplifier and the second auxiliary power amplifier output an amplified fourth differential signal to the folding power synthesis transformer network.
Preferably, the auxiliary power amplifier network further includes a phase compensation network.
Preferably, the phase compensation network comprises: the first inductor is connected with the output end of the first auxiliary power amplifier, the second inductor is connected with the output end of the second auxiliary power amplifier, the two ends of the third capacitor are respectively connected with the output ends of the first auxiliary power amplifier and the second auxiliary power amplifier, and the fourth capacitor is respectively connected with the output ends of the first inductor and the second inductor.
Preferably, the input matching network includes: the first input matching network is connected with one output end of the power divider and consists of a first inductor and a third capacitor, and the second input matching network is connected with the other output end of the power divider and consists of a second inductor and a fourth capacitor; the first input matching network receives the first quadrature signal RF + and is matched to the driving amplification network, and the second input matching network receives the second quadrature signal RF-and is matched to the driving amplification network.
Preferably, the driving amplification network comprises: the first driving amplifier tube is connected with the first input matching network, and the second driving amplifier tube is connected with the second input matching network; the differential signal conversion network comprises: a first transformer type balun connected to the first driving amplifier tube, a second harmonic capacitor connected to ground and a center tap of a secondary coil of the first transformer type balun, and a sixth capacitor connected in parallel to two ports of the secondary coil of the first transformer type balun so as to adjust impedance matching between the first transformer type balun and input impedance of the main power amplifier, wherein the differential signal conversion network 105 includes a second driving amplifier tube Q2Connected second transformer type balun XFM3. Connecting ground and XFM3Secondary harmonic capacitor C of secondary coil center tap7And with XFM3Capacitor C with two parallel ports of secondary coil8To adjust XFM3And auxiliary power amplifier input impedance.
Preferably, the main power amplifier network comprises a first main power amplifier tube Q3And a second main power amplifier tube Q4The first main power amplifier tube Q3A second main power amplifier tube Q4Is connected with the first transformer type balun XFM2Said first transformer type balun XFM2Receiving the amplified first orthogonal signal RF + and performing differential divisionConverting the signal and outputting a first differential signal to the first main power amplifier tube Q3And said second main power amplifier tube Q4From said main power amplifier tube Q3And Q4And outputting the amplified second differential signal to the folding power combining transformer.
Preferably, the auxiliary power amplifier network further comprises a phase compensation network (impedance inversion network) for implementing 90 ° phase compensation. Specifically, the phase compensation network includes: third bond wire inductance BW3A third inductor L3A ninth capacitor C9And a fourth bond wire inductor BW4A fourth inductor L4And a tenth capacitor C10The third bond wire inductance BW3Is connected with the first auxiliary power amplifier tube Q5The fourth bond wire inductance BW4Connecting the second auxiliary power amplifier tube Q6The ninth capacitor C9Are respectively connected with the first auxiliary power amplifying tube Q5And a second auxiliary power amplifier tube Q6Of the tenth capacitor C10Are respectively connected with the third inductors L3A fourth inductor L4To the output terminal of (a).
Preferably, the folded power combining transformer network 108 includes a transformer balun XFM4And is connected in parallel at XFM4Capacitance C between secondary winding output port RFout and groundP1，XFM4Port MA + through first bond wire inductance BW1Is connected with a first main power amplifier tube Q3Output terminal, XFM4Port MA-through second bond wire inductance BW2Connected with a second main power amplifier tube Q4Output terminal, XFM4The ports Aux + and Aux-are connected to the tenth capacitor C of the auxiliary power amplifier network 10710Two ends of the first auxiliary power amplifier tube Q are connected to the first auxiliary power amplifier tube Q through an impedance inversion network 2015And a second auxiliary amplifying tube Q6Of XFM output terminal4Secondary winding output port RFout is connected to antenna loadZ L 。
In the invention, the transformer is used for replacing the traditional power divider and the quarter-wavelength transmission line, and particularly, the power synthesis adopts a folding power synthesis transformer network, so that the power synthesis transformer network has the advantages of compact structure, small occupied size, small insertion loss and wide frequency band, is more suitable for a radio frequency integrated circuit, and has the advantages of high efficiency, good linearity and high integration level.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings used in the description of the present invention or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on the drawings without creative efforts.
Fig. 1 is a schematic diagram of a conventional doherty power amplifier;
fig. 2 is a schematic diagram of a wideband doherty power amplifier provided by the present invention;
fig. 3 is a schematic structural view of a folding power combining transformer according to the present invention;
fig. 4 is a schematic diagram of a folded power combining transformer network according to the present invention;
figure 5 is a schematic diagram of a two HBT wideband doherty power amplifier of an embodiment of the present invention.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Every other embodiment of the pedestrian, which is obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention, falls within the protection scope of the present invention.
The terms "comprising" and "having," and any variations thereof, in the description and claims of this application and the description of the figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
As shown in fig. 2, fig. 2 is a novel wideband doherty rf power amplifier provided by the present invention, which includes: a power divider 10, an input matching network 20, a driving amplifying network 30, a differential signal converting network 40, a main power amplifying network 50, an auxiliary power amplifying network 60, and a folding type power combining transformer network 70.
In the present invention, the power divider 10 is configured to output a first orthogonal signal RF + and a second orthogonal signal RF-having a phase difference of 90 ° after performing power division on an input signal RFin; the input matching network 20 is respectively connected with the output ends of the power divider 10, and the output end of the input matching network 20 is connected with the driving amplification network 30, and is used for receiving the first quadrature signal RF + and the second quadrature signal RF-and matching to the driving amplification network 30; the output end of the driving amplification network 30 is connected to the differential signal conversion network 40, and the driving amplification network 30 is configured to amplify the first quadrature signal RF + and the second quadrature signal RF-and then input the amplified signals to the differential signal conversion network 40; the output end of the differential signal conversion network 40 is connected to the main power amplifier network 50 and the auxiliary power amplifier network 60, and is configured to perform single-end to differential signal conversion on the amplified first orthogonal signal RF + and the amplified second orthogonal signal RF-, and input the converted signals to the main power amplifier network 50 and the auxiliary power amplifier network 60, respectively; the main power amplifier network 50 and the auxiliary power amplifier network 60 are connected to the folded power synthesizing transformer network 70, and power is amplified through the main power amplifier network 50 and the auxiliary power amplifier network 60 and then synthesized and output through the folded power synthesizing transformer network 70.
In the present invention, as shown in FIG. 2, theThe XFM of the folded power combining transformer in the folded power combining transformer network 704Comprises three layers of metal structures, wherein, the outermost layer of metal structure is wound with a primary coil L of a main power amplifier connected with the main power amplifier network 50p1Connected with the differential output port of the main power amplifier network 50 through the port MA + and the port MA-, and the innermost layer metal structure is wound with an auxiliary power amplifier primary coil L connected with the auxiliary power amplifier network 60p2The auxiliary power amplifier is connected with a differential output port of an auxiliary power amplifier network through a port Aux + and a port Aux-, a secondary coil is wound on the intermediate layer metal structure, one port of the secondary coil is used for connecting an antenna load, the other port of the secondary coil is grounded to form a single-ended output structure, and a capacitor C is connected in parallel between the two ports of the secondary coilP1And is used for adjusting the inductance of the secondary coil.
In the present invention, a folded power combining transformer network 70 (XFM)4) The compact structure not only occupies smaller size, but also has small insertion loss and wide frequency band, and the working principle diagram is shown in figure four. XFM4The MA + and MA-ports of the primary coil are connected to the output end of the main power amplifier, the Aux + and Aux-ports are connected to the output end of the auxiliary power amplifier, and the center tap port VS1MA and VS2And the Aux is connected with a power supply and is respectively used for supplying power to the main power amplifier and the auxiliary power amplifier. The main power amplifier secondary coil and the auxiliary power amplifier primary coil are in loose coupling relation, and the shared secondary coil forms parallel power synthesis of the folding transformer network. In the low power mode, the folded transformer doherty rf power amplifier designed by the present invention operates only with the main power amplifier and all secondary coils are used to couple power from the primary coil of the main power amplifier. In the high-power working mode, the main power amplifier and the auxiliary power amplifier are opened, the main power amplifier keeps the maximum output power, the power of the auxiliary power amplifier is gradually increased to the maximum output power along with the increase of the input power, and the output power of the main power amplifier and the auxiliary power amplifier after synthesis is also maximized.
In the present invention, the power divider 10 includes: a first capacitor C1A second capacitor C2And a first transformer. The transformer is adopted as the power divider, and compared with the traditional power divider, the power divider has smaller structural size and is more beneficial to collectionUsed in an integrated circuit.
In the present invention, the input matching network 20 includes: a first input matching network connected to one output terminal of the power divider 10, and a second input matching network connected to the other output terminal of the power divider 10; the first input matching network receives the first quadrature signal RF + and is matched to the driving amplification network, and the second input matching network receives the second quadrature signal RF-and is matched to the driving amplification network.
In the present invention, the driving amplification network 30 includes: a first driver amplifier PA connected to the first input matching network1And a second driver amplifier PA connected to the second input matching network2. The differential signal conversion network 40 includes: and the first driver amplifier PA1Connected first transformer type balun XFM2And the second driver amplifier PA2Connected second transformer type balun XFM3。
In the present invention, the main power amplifier network 50 includes a first main power amplifier PA3And a second main power amplifier PA4Said first main power amplifier PA3A second main power amplifier PA4Is connected with the first transformer type balun XFM2Said first transformer type balun XFM2Receiving the amplified first quadrature signal RF +, then performing conversion of a differential signal, and outputting a first differential signal to the first main power amplifier PA3And said second main power amplifier PA4The amplified second differential signal is outputted from the first and second main power amplifiers to the folding power combining transformer network 70.
In the present invention, the auxiliary power amplifier network 60 includes a first auxiliary power amplifier PA5And a second auxiliary power amplifier PA6Said first auxiliary power amplifier PA5A second auxiliary power amplifier PA6Is connected to the second transformer type balun XFM3Said second transformer type balun XFM3Receiving the passing throughA large second quadrature signal RF-followed by a conversion of the differential signal and outputting a third differential signal to the first auxiliary power amplifier PA5And the second auxiliary power amplifier PA6The amplified fourth differential signal is outputted from the first and second auxiliary power amplifiers to the folding power combining transformer network 70.
In the present invention, the auxiliary power amplifier network 60 further includes a phase compensation network (impedance inversion network) 61 for implementing 90 ° phase compensation. Specifically, the phase compensation network includes: first inductance L1A second inductor L2A third capacitor C3And a fourth capacitor C4The first inductance L1Connecting the first auxiliary power amplifier PA5The second inductance L, the output terminal of2Connecting the second auxiliary power amplifier PA6An output terminal of the third capacitor C3Are respectively connected with the first auxiliary power amplifier PA5And a second auxiliary power amplifier PA6Of the fourth capacitor C4Are respectively connected with the first inductors L1A second inductor L2To the output terminal of (a).
In the present invention, the folded power combining transformer network 70 includes a transformer balun XFM4And is connected in parallel at XFM4Capacitance C between secondary winding output port RFout and groundP1，XFM4Port MA + through first bond wire inductance BW1Connecting a first main power amplifier PA3Output terminal, XFM4Port MA-through second bond wire inductance BW2Connecting a second main power amplifier PA4Output terminal, XFM4The ports Aux + and Aux-are connected to the fourth capacitor C of the auxiliary power amplifier network 604Connected at both ends to a first auxiliary power amplifier PA via an impedance inversion network 615And a second auxiliary amplifier PA6To the output terminal of (a).
Example two
As shown in fig. 5, fig. 5 is an HBT wideband doherty rf power amplifier provided in an embodiment of the present invention, including: a power divider 101, an input matching network 102, a drive amplifier network 103, differential signal conversion networks 104 and 105, a main amplifier network 106, an auxiliary amplifier network 107, and a folded power synthesis transformer network 108.
In the embodiment of the present invention, the power divider 101 includes: a first capacitor C1A second capacitor C2And a first transformer. Compared with the traditional power divider, the transformer used as the power divider has smaller structural size and is more beneficial to being used in an integrated circuit.
In an embodiment of the present invention, the input matching network 102 includes: is connected with an output end of the power divider 101 and is composed of a first inductor L1And a third capacitance C3A first input matching network connected with the other output end of the power divider 101 and composed of a second inductor L2And a fourth capacitance C4A second input matching network; the first input matching network receives the first quadrature signal RF + and is matched to the driving amplification network, and the second input matching network receives the second quadrature signal RF-and is matched to the driving amplification network.
In the embodiment of the present invention, the driving amplification network 103 includes: a first drive amplifier tube Q connected to the first input matching network1And a second driving amplifier tube Q connected with the second input matching network2. The differential signal conversion network 104 includes: and the first driving amplifier tube Q1Connected first transformer type balun XFM2Connecting ground and XFM2Secondary harmonic capacitor C of secondary coil center tap5And with XFM2Capacitor C with two parallel ports of secondary coil6To adjust XFM2And the main power amplifier input impedance. The differential signal conversion network 105 comprises a second driving amplifier tube Q2Connected second transformer type balun XFM3. Connecting ground and XFM3Secondary harmonic capacitor C of secondary coil center tap7And with XFM3Capacitor C with two parallel ports of secondary coil8To adjust XFM3And auxiliary power amplifier input impedanceImpedance matching therebetween.
In the embodiment of the present invention, the main power amplifier network 106 includes a first main power amplifier tube Q3And a second main power amplifier tube Q4The first main power amplifier tube Q3A second main power amplifier tube Q4Is connected with the first transformer type balun XFM2Said first transformer type balun XFM2Receiving the amplified first quadrature signal RF +, then converting the differential signal and outputting the first differential signal to the first main power amplifier tube Q3And said second main power amplifier tube Q4From said main power amplifier tube Q3And Q4The amplified second differential signal is output to the folding power combining transformer 108.
In the embodiment of the present invention, the auxiliary power amplifier network 107 includes a first auxiliary power amplifier tube Q5And a second auxiliary power amplifier tube Q6. The first auxiliary power amplifier tube Q5A second auxiliary power amplifier tube Q6Is connected to the second transformer type balun XFM3Said second transformer type balun XFM3Receiving the amplified second quadrature signal RF-and then converting the differential signal and outputting a third differential signal to the first auxiliary power amplifier tube Q5And the second auxiliary power amplifier tube Q6The auxiliary power amplifier tube Q5And Q6And outputting the amplified fourth differential signal to the folded power combining transformer network 108.
In the implementation of the present invention, the auxiliary power amplifier network 107 further includes a phase compensation network (impedance inversion network) 201, configured to implement 90 ° phase compensation. Specifically, the phase compensation network includes: third bond wire inductance BW3A third inductor L3A ninth capacitor C9And a fourth bond wire inductor BW4A fourth inductor L4And a tenth capacitor C10The third bond wire inductance BW3Is connected with the first auxiliary power amplifier tube Q5The fourth bond wire inductance BW4Connecting the second auxiliary powerPower amplifier tube Q6The ninth capacitor C9Are respectively connected with the first auxiliary power amplifying tube Q5And a second auxiliary power amplifier tube Q6Of the tenth capacitor C10Are respectively connected with the third inductors L3A fourth inductor L4To the output terminal of (a).
In the practice of the invention, the folded power combining transformer network 108 includes a third transformer balun XFM4And a balun XFM connected in parallel with the third transformer4Capacitance C between secondary winding output port RFout and groundP1Folding power synthesis transformer XFM4Port MA + through first bond wire inductance BW1Is connected with a first main power amplifier tube Q3Output terminal, XFM4Port MA-through second bond wire inductance BW2Connected with a second main power amplifier tube Q4Output terminal, folding power synthesis transformer XFM4The ports Aux + and Aux-are connected to the tenth capacitor C of the auxiliary power amplifier network 10710Two ends of the first auxiliary power amplifier tube Q are connected to the first auxiliary power amplifier tube Q through an impedance inversion network 2015And a second auxiliary amplifying tube Q6The output end of the folded power synthesis transformer XFM4Secondary winding output port RFout is connected to antenna loadZ L 。
In the invention, the transformer is used for replacing the traditional power divider and the quarter-wavelength transmission line, and particularly, the power synthesis adopts a folding power synthesis transformer network, so that the power synthesis transformer network has the advantages of compact structure, small occupied size, small insertion loss and wide frequency band, is more suitable for a radio frequency integrated circuit, and has the advantages of high efficiency, good linearity and high integration level.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (16)
1. A novel wideband doherty rf power amplifier comprising: the power amplifier comprises a power distributor, an input matching network, a drive amplifying network, a differential signal conversion network, a main power amplifier network, an auxiliary power amplifier network and a folding power synthesis transformer network;
the power divider is used for dividing power of an input signal and outputting a first orthogonal signal RF + and a second orthogonal signal RF-;
the input matching networks are respectively connected with the output ends of the power dividers, and the output ends of the input matching networks are connected with the driving amplification network and are used for receiving the first orthogonal signal RF + and the second orthogonal signal RF-and matching the first orthogonal signal RF + and the second orthogonal signal RF-to the driving amplification network;
the output end of the driving amplification network is connected with the differential signal conversion network, and the driving amplification network is used for amplifying the first orthogonal signal RF + and the second orthogonal signal RF-and then inputting the amplified signals into the differential signal conversion network;
the output end of the differential signal conversion network is respectively connected with the main power amplifier network and the auxiliary power amplifier network, and is used for carrying out single-end to differential signal conversion on the amplified first orthogonal signal RF + and the amplified second orthogonal signal RF-and respectively inputting the converted signals into the main power amplifier network and the auxiliary power amplifier network;
the main power amplifier network and the auxiliary power amplifier network are connected with the folded power synthesis transformer network, and power synthesis and output are carried out through the folded power synthesis transformer network after power amplification is carried out through the main power amplifier network and the auxiliary power amplifier network.
2. The novel wideband doherty rf power amplifier according to claim 1, wherein the folded power combining transformer comprises three layers of metal structures, wherein the outermost layer of metal structure is wound with a main power amplifier primary coil connected to the main power amplifier network, the innermost layer of metal structure is wound with an auxiliary power amplifier primary coil connected to the auxiliary power amplifier network, the middle layer of metal structure is wound with a secondary coil, one port of the secondary coil is used for connecting to an antenna load, and a capacitor is connected in parallel between two ports of the secondary coil.
3. The novel wideband doherty rf power amplifier of claim 1 wherein the power splitter comprises: the first capacitor, the second capacitor and the first transformer.
4. The novel wideband doherty rf power amplifier of claim 1 wherein the input matching network comprises: a first input matching network connected to one output of the power divider and a second input matching network connected to another output of the power divider; the first input matching network receives the first quadrature signal RF + and is matched to the driving amplification network, and the second input matching network receives the second quadrature signal RF-and is matched to the driving amplification network.
5. The novel wideband doherty rf power amplifier of claim 4 wherein the driver amplifier network includes: a first driver amplifier connected to the first input matching network, and a second driver amplifier connected to the second input matching network.
6. The novel wideband doherty rf power amplifier according to claim 5 and wherein said differential signal switching network comprises: a first transformer type balun connected to the first driver amplifier, and a second transformer type balun connected to the second driver amplifier.
7. The novel wideband doherty RF power amplifier according to claim 6, wherein the main power amplifier network includes a first main power amplifier and a second main power amplifier, the input terminals of the first main power amplifier and the second main power amplifier are connected to the first transformer type balun, the first transformer type balun receives the amplified first quadrature signal RF +, converts the quadrature signal into a differential signal and outputs the differential signal to the first main power amplifier and the second main power amplifier, and the first main power amplifier and the second main power amplifier output the amplified second differential signal to the folded power combining transformer network.
8. The novel wideband doherty RF power amplifier according to claim 6, wherein the auxiliary power amplifier network comprises a first auxiliary power amplifier and a second auxiliary power amplifier, the input terminals of the first auxiliary power amplifier and the second auxiliary power amplifier are connected to the second transformer type balun, the second transformer type balun receives the amplified second quadrature signal RF-and then performs differential signal conversion and outputs a third differential signal to the first auxiliary power amplifier and the second auxiliary power amplifier, and the first auxiliary power amplifier and the second auxiliary power amplifier output an amplified fourth differential signal to the folded power combining transformer network.
9. The novel wideband doherty rf power amplifier of claim 8 wherein the auxiliary power amplifier network further includes a phase compensation network.
10. The novel wideband doherty rf power amplifier of claim 9 wherein the phase compensation network comprises: the first inductor is connected with the output end of the first auxiliary power amplifier, the second inductor is connected with the output end of the second auxiliary power amplifier, the two ends of the third capacitor are respectively connected with the output ends of the first auxiliary power amplifier and the second auxiliary power amplifier, and the fourth capacitor is respectively connected with the output ends of the first inductor and the second inductor.
11. The novel wideband doherty rf power amplifier of claim 1 wherein the input matching network comprises: the first input matching network is connected with one output end of the power divider and consists of a first inductor and a third capacitor, and the second input matching network is connected with the other output end of the power divider and consists of a second inductor and a fourth capacitor; the first input matching network receives the first quadrature signal RF + and is matched to the driving amplification network, and the second input matching network receives the second quadrature signal RF-and is matched to the driving amplification network.
12. The novel wideband doherty rf power amplifier of claim 11 wherein the driver amplifier network comprises: the first driving amplifier tube is connected with the first input matching network, and the second driving amplifier tube is connected with the second input matching network; the differential signal conversion network comprises: the differential signal conversion network comprises a second transformer type balun connected with the second driving amplification tube, a second harmonic capacitor connected with the center tap of the second transformer type balun secondary coil, and an eighth capacitor connected with the two ports of the second transformer type balun secondary coil in parallel so as to adjust the impedance matching between the second transformer type balun and the auxiliary power amplifier input impedance.
13. The novel wideband doherty RF power amplifier according to claim 12, wherein the main power amplifier network includes a first main power amplifier tube and a second main power amplifier tube, input ends of the first main power amplifier tube and the second main power amplifier tube are connected to the first transformer type balun, the first transformer type balun receives the amplified first quadrature signal RF +, converts a differential signal and outputs the first differential signal to the first main power amplifier tube and the second main power amplifier tube, and the first main power amplifier tube and the second main power amplifier tube output the amplified second differential signal to the folded power combining transformer network.
14. The novel wideband doherty RF power amplifier according to claim 13, wherein the auxiliary power amplifier network includes a first auxiliary power amplifier tube and a second auxiliary power amplifier tube, input ends of the first auxiliary power amplifier tube and the second auxiliary power amplifier tube are connected to the second transformer type balun, the second transformer type balun receives the amplified second orthogonal signal RF-and then converts a differential signal and outputs a third differential signal to the first auxiliary power amplifier tube and the second auxiliary power amplifier tube, and the first auxiliary power amplifier tube and the second auxiliary power amplifier tube output an amplified fourth differential signal to the folded power combining transformer network.
15. The novel wideband doherty rf power amplifier of claim 14 wherein said auxiliary power amplifier network further includes a phase compensation network for achieving 90 ° phase compensation, said phase compensation network comprising: the third bondwire inductor is connected with the output end of the first auxiliary power amplifier tube, the fourth bondwire inductor is connected with the output end of the second auxiliary power amplifier tube, two ends of the ninth capacitor are respectively connected with the output ends of the first auxiliary power amplifier tube and the second auxiliary power amplifier tube, and the tenth capacitor is respectively connected with the output ends of the third inductor and the fourth inductor.
16. The novel wideband Doherty RF power amplifier of claim 15, the folding power synthesis transformer network comprises a folding power synthesis transformer and a parallel capacitor connected between the output port of a secondary coil of the folding power synthesis transformer and the ground in parallel, wherein a port MA + of the folding power synthesis transformer is connected with the output end of a first main power amplifier tube through a first bonding wire inductor, a port MA-of the folding power synthesis transformer is connected with the output end of a second main power amplifier tube through a second bonding wire inductor, a port Aux + and a port Aux-of the folding power synthesis transformer are connected to two ends of a tenth capacitor of an auxiliary power amplifier network and then connected to the output ends of the first auxiliary power amplifier tube and the second auxiliary amplifier tube through an impedance inversion network, and an output port RFout of the secondary coil of the port is connected with an antenna load.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210022140.3A CN114050792A (en) | 2022-01-10 | 2022-01-10 | Novel broadband Doherty radio frequency power amplifier |
| PCT/CN2022/132956 WO2023130843A1 (en) | 2022-01-10 | 2022-11-18 | Novel broadband doherty radio frequency power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210022140.3A CN114050792A (en) | 2022-01-10 | 2022-01-10 | Novel broadband Doherty radio frequency power amplifier |
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| CN114050792A true CN114050792A (en) | 2022-02-15 |
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| CN202210022140.3A Pending CN114050792A (en) | 2022-01-10 | 2022-01-10 | Novel broadband Doherty radio frequency power amplifier |
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| WO (1) | WO2023130843A1 (en) |
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| CN114785289A (en) * | 2022-04-02 | 2022-07-22 | 华南理工大学 | Doherty power amplifier |
| CN114824720A (en) * | 2022-04-13 | 2022-07-29 | 电子科技大学 | Compact transformer Wilkinson balun embedded with impedance transformation function |
| CN114824721A (en) * | 2022-04-27 | 2022-07-29 | 中国电子科技集团公司第二十九研究所 | Ultra-wideband miniaturized power divider |
| CN114826173A (en) * | 2022-06-30 | 2022-07-29 | 深圳市时代速信科技有限公司 | Radio frequency power device and electronic equipment |
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