阅读说明：本技术 一种针对车联网通信的射频功率放大器 (Radio frequency power amplifier for communication of Internet of vehicles ) 是由 刘林盛 邬海峰 李辉 梁尚春 赵元林 于 2019-09-20 设计创作，主要内容包括：本发明公开了一种针对车联网通信的射频功率放大器,包括输入四路差分移相分配及偏置网络、第一差分双堆叠放大器、第二差分双堆叠放大器、第三差分双堆叠放大器、第四差分双堆叠放大器、级间四路差分匹配及偏置网络以及输出四路差分移相合成及偏置网络,本发明核心架构采用场效应管构成的双堆叠放大网络在射频微波段的高功率、高增益特性,同时利用差分放大器在微波频段的良好的寄生参数抑制性,与双级Doherty驱动放大结构良好的功率回退效率特性相结合,使得整个功率放大器获得了良好的高增益、高回退效率和高功率输出能力。(The invention discloses a radio frequency power amplifier aiming at vehicle networking communication, which comprises an input four-way differential phase-shifting distribution and bias network, a first differential double-stack amplifier, a second differential double-stack amplifier, a third differential double-stack amplifier, a fourth differential double-stack amplifier, an interstage four-way differential matching and bias network and an output four-way differential phase-shifting synthesis and bias network.)

1. A radio frequency power amplifier aiming at communication of the Internet of vehicles is characterized by comprising an input four-way differential phase-shift distribution and bias network, a first differential double-stacked amplifier, a second differential double-stacked amplifier, a third differential double-stacked amplifier, a fourth differential double-stacked amplifier, an interstage four-way differential matching and bias network and an output four-way differential phase-shift synthesis and bias network;

the input end of the input four-way differential phase-shifting distribution and bias network is the input end of the whole power amplifier, the first and third output ends of the input four-way differential phase-shifting distribution and bias network are connected with the first and second input ends of the first differential double-stacked amplifier, the second and fourth output ends of the input four-way differential phase-shifting distribution and bias network are connected with the first and second input ends of the second differential double-stacked amplifier, and the phase difference of signals of the input four-way differential phase-shifting distribution and bias network and the first, second, third and fourth output ends is 0 degree, 90 degrees, 180 degrees and 270 degrees respectively;

the first and second output ends of the first differential double-stack amplifier are connected with the first and second input ends of the interstage four-way differential matching and biasing network; the first output end and the second output end of the second differential double-stack amplifier are connected with the third input end and the fourth input end of the interstage four-way differential matching and biasing network;

the first and second input ends of the third differential double-stacked amplifier are connected with the first and second output ends of the interstage four-way differential matching and biasing network, and the first and second output ends of the third differential double-stacked amplifier are connected with the first and third output ends of the output four-way differential phase-shifting synthesizing and biasing network; the first and second input ends of a fourth differential double-stacked amplifier are connected with the third and fourth output ends of the interstage four-way differential matching and biasing network, the first and second output ends of the fourth differential double-stacked amplifier are connected with the second and fourth output ends of the output four-way differential phase-shifting synthesis and biasing network, and the phase difference between the output ends of the output four-way differential phase-shifting synthesis and biasing network and the phase difference between the signals of the first, second, third and fourth input ends is 270 degrees, 180 degrees, 90 degrees and 0 degree respectively;

and the output end of the output four-way differential phase-shift synthesis and bias network is the output end of the whole power amplifier.

2. The RF power amplifier of claim 1, wherein an inductor L is connected to an input end of the input four-way differential phase shift distribution and bias network₁Inductance L₁The other end of the transformer is connected with a coupling transformer T₁Dotted terminal of primary coil and grounding capacitor C₁Transformer T₁The non-homonymous end of the primary coil of (1) is grounded; transformer T₁The homonymous terminal of the first secondary coil is connected with the input four-way differential phase shift distribution and biasA first output terminal of the network, a transformer T₁The non-homonymous end of the first secondary coil is connected with the second output end of the input four-way differential phase-shift distribution and bias network, and the transformer T₁The homonymous end of the second secondary coil is connected with the third output end of the input four-way differential phase-shift distribution and bias network, and the transformer T₁The non-homonymous terminal of the second secondary coil is connected with the fourth output terminal of the input four-way differential phase-shift distribution and bias network,

connecting transformer T₁The middle tap of the first secondary coil and the second secondary coil passes through an inductor L₂Series resistance R₁Are interconnected, while the transformer T₁The middle tap of the first-stage coil is also connected with an inductor L₃Inductance L₃The other end of the capacitor is connected with a bypass grounding capacitor C₂And a gate voltage V_g1。

3. The RF power amplifier for Internet of vehicles communication according to claim 1, wherein the first input terminal of the Nth differential dual-stack amplifier is connected with a grounding capacitor C_pjAnd an inductance L_pj，L_pjThe other end of the resistor is connected with a grounding resistor R_pjAnd a transistor M_pjOf the grid electrode, M_pjSource of (3) is grounded, M_pjDrain electrode of (3) is connected with the transistor M_sjSource of (1), transistor M_sjThe grid of the capacitor is connected with a grounding capacitor C_sjAt the same time M_sjAnd M_pjAlso through a resistor R_sjConnection, M_sjIs connected with a feedback resistor R_mjAnd an inductance L_sjResistance R_mjIs connected with M at the other end_sjGate of (1), inductor L_sjThe other end of the capacitor is connected with a grounding capacitor C_ujAnd the second input end of the Nth differential double-stack amplifier is connected with a grounded capacitor C in the same way as the first output end of the Nth differential double-stack amplifier_qjAnd an inductance L_qj，L_qjThe other end of the resistor is connected with a grounding resistor R_qjAnd a transistor M_qjOf the grid electrode, M_qjSource of (3) is grounded, M_qjDrain electrode of (3) is connected with the transistor M_tjSource of (1), transistor M_tjIs connected with the grid electrodeGround capacitor C_tjAt the same time M_tjAnd M_qjAlso through a resistor R_tjConnection, M_tjIs connected with a feedback resistor R_njAnd an inductance L_tjResistance R_njIs connected with M at the other end_tjGate of (1), inductor L_tjThe other end of the capacitor is connected with a grounding capacitor C_vjAnd a second output terminal of the Nth differential dual-stack amplifier, transistor M_tjAnd M_sjAlso through a capacitor R_ojInterconnection, wherein N is one, two, three, four, j =1, 2, 3, 4,

the first and third differential dual-stacked amplifiers operate in a deep class AB amplification state, and the second and fourth differential dual-stacked amplifiers operate in a shallow class C amplification state.

4. The RF power amplifier of claim 1, wherein the first and second inputs of the interstage four-way differential matching and biasing network are connected to a transformer T₂The third and fourth input ends of the interstage four-way differential matching and biasing network are connected with a transformer T₃Non-dotted terminal and dotted terminal of primary coil, transformer T₂Intermediate tap of primary coil and transformer T₃An inductor L is arranged between the middle taps of the primary coil₅Interconnection, simultaneous transformer T₂The middle tap of the primary coil is also connected with an inductor L₄Inductance L₄The other end of the capacitor is connected with a bypass grounding capacitor C₃And a drain voltage V_d1The first and second output ends of the interstage four-way differential matching and biasing network are connected with a transformer T₂The third and fourth input ends of the interstage four-way differential matching and biasing network are connected with a transformer T₃Non-homonymous and homonymous terminals of secondary winding, transformer T₂Center tap of secondary coil and transformer T₃An inductor L is arranged between the middle taps of the secondary coil₇Series resistance R₂Are interconnected, while the transformer T₂The middle tap of the secondary coil is also connected with an inductor L₆Inductance L₆The other end of the capacitor is connected with a bypass grounding capacitor C₄And a gate voltage V_g2。

5. The RF power amplifier of claim 1, wherein the first and second inputs of the output four-way differential phase-shifting combiner and bias network are connected to a transformer T₄The third and fourth input ends of the output four-path differential phase-shift synthesis and bias network are connected with a transformer T₄Non-dotted and dotted terminals of the second secondary winding, transformer T₄An inductor L is arranged between the middle taps of the first secondary coil and the second secondary coil₈Interconnection, transformer T₄The middle tap of the first secondary coil is also connected with an inductor L₉，L₉The other end of the capacitor is connected with a bypass grounding capacitor C₅And a drain bias voltage V_d2Transformer T₄Primary coil's dotted terminal connection inductance L₁₀And a ground capacitor C₆Inductance L₁₀The other end of the output four-way differential phase-shift synthesis and bias network is connected with the output end of the output four-way differential phase-shift synthesis and bias network and a transformer T₄The non-dotted terminal of the primary coil of (a) is grounded.

Technical Field

The invention relates to the field of field effect transistor radio frequency power amplifiers and integrated circuits, in particular to a radio frequency power amplifier chip circuit for vehicle networking communication, which aims at a transmitting module applied to vehicle networking communication (C-V2X) based on cellular technology.

Background

With the rapid development of 5G wireless communication systems and radio frequency circuits, the car networking communication based on the 5.9GHz frequency band cellular technology also has unprecedented application space, and the radio frequency front-end receiving and transmitting circuit of the car networking communication system also develops towards the directions of high performance, high integration and low power consumption. Therefore, the radio frequency power amplifier of the transmitter is urgently required by the internet of vehicles communication market to have high linear output power and efficiency, reduce heat dissipation and improve circuit stability, and the power amplifier chip is the key expected to meet the market requirement. However, when the integrated circuit process design is adopted to realize the power amplifier chip circuit in the car networking communication market, the performance and the cost of the power amplifier chip circuit are limited to a certain extent, and the performance and the cost are mainly reflected as follows:

(1) the power amplifier efficiency is limited under high back-off power, and the power consumption is higher: when the traditional AB type power amplifier realizes the amplification of a high peak-to-average ratio signal, the efficiency is lower under high back-off power, so the power consumption is larger.

(2) Power gain is limited, and insertion loss degradation is large: the 5.9GHz frequency band is usually realized by adopting a semiconductor process with lower cost and lower characteristic frequency, so that the single-tube gain of the power amplifier is limited, the parasitic parameters of a transistor become larger along with the increase of the frequency band, the parasitic loss of a circuit is greatly deteriorated, and the performance of the circuit is influenced;

(3) limitations with lumped parameter circuit design: when a circuit matched with the traditional lumped parameter RLC is designed in the 5.9GHz frequency band, devices with larger chip areas such as an inductor and a capacitor still need to be adopted, and the limitation is brought to the circuit design because the substrate loss is increased and the inductance Q value is lower.

The common circuit structures with high linear output power and efficiency amplifiers are many, the most typical is a Doherty single-ended power amplifier, but the difficulty is high when the traditional Doherty single-ended power amplifier needs to meet the power amplifier index requirements of the communication market of the internet of vehicles at the same time, mainly because:

(1) when the traditional Doherty single-ended power amplifier realizes the circuit design of a 5.9GHz frequency band, the backspacing efficiency index is poor due to the influence of parasitic parameters;

(2) when the traditional Doherty single-ended power amplifier realizes the circuit design of a 5.9GHz frequency band, an AB class driving amplifier is often adopted to drive the Doherty amplifier, so that when the Doherty amplifier works with the back-off efficiency and is subjected to the gain compensation effect of the AB class amplifier, the good load traction effect under the high back-off of a main circuit and an auxiliary circuit of the Doherty amplifier cannot be met at the same time, the back-off efficiency is reduced, and the linearity index is deteriorated.

In addition, the use of depletion mode fets often requires additional supply voltage, which also increases the complexity of the circuit.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a radio frequency power amplifier for internet of vehicles communication, which combines the advantages of a differential stacked amplifier technology and a two-stage Doherty driving technology and has the advantages of high power, high gain, low cost and the like in a radio frequency microwave frequency band. Meanwhile, the enhancement-mode field effect transistor is adopted, so that a complex power supply circuit of a depletion-mode transistor is avoided.

The technical scheme for solving the technical problems is as follows: a radio frequency power amplifier aiming at communication of the Internet of vehicles is characterized by comprising an input four-way differential phase-shift distribution and bias network, a first differential double-stacked amplifier, a second differential double-stacked amplifier, a third differential double-stacked amplifier, a fourth differential double-stacked amplifier, an interstage four-way differential matching and bias network and an output four-way differential phase-shift synthesis and bias network;

the input end of the input four-way differential phase-shifting distribution and bias network is the input end of the whole power amplifier, the first and third output ends of the input four-way differential phase-shifting distribution and bias network are connected with the first and second input ends of the first differential double-stacked amplifier, the second and fourth output ends of the input four-way differential phase-shifting distribution and bias network are connected with the first and second input ends of the second differential double-stacked amplifier, and the phase difference of signals of the input four-way differential phase-shifting distribution and bias network and the first, second, third and fourth output ends is 0 degree, 90 degrees, 180 degrees and 270 degrees respectively;

the first output end and the second output end of the first differential double-stack amplifier are connected with the first input end and the second input end of the interstage four-way differential matching and biasing network; the first output end and the second output end of the second differential double-stack amplifier are connected with the third input end and the fourth input end of the interstage four-way differential matching and biasing network;

the first and second input ends of the third differential double-stacked amplifier are connected with the first and second output ends of the interstage four-way differential matching and biasing network, and the first and second output ends of the third differential double-stacked amplifier are connected with the first and third output ends of the output four-way differential phase-shifting synthesis and biasing network; the first and second input ends of the fourth differential double-stacked amplifier are connected with the third and fourth output ends of the interstage four-way differential matching and biasing network, the first and second output ends of the fourth differential double-stacked amplifier are connected with the second and fourth output ends of the output four-way differential phase-shifting synthesizing and biasing network, and the phase difference between the output end of the output four-way differential phase-shifting synthesizing and biasing network and the signal phase difference between the output end of the output four-way differential phase-shifting synthesizing and biasing network and the first, second, third and fourth input ends is 270 degrees, 180 degrees, 90 degrees and 0 degree respectively;

the output end of the output four-way differential phase-shift synthesis and bias network is the output end of the whole power amplifier.

Furthermore, the input end of the input four-way differential phase-shift distribution and bias network is connected with an inductor L₁Inductance L₁The other end of the transformer is connected with a coupling transformer T₁Dotted terminal of primary coil and grounding capacitor C₁Transformer T₁The non-homonymous end of the primary coil of (1) is grounded; transformer T₁The same-name end of the first secondary coil is connected with the first output end of the input four-way differential phase-shift distribution and bias network, and the transformer T₁The non-homonymous end of the first secondary coil is connected with the second output end of the input four-way differential phase-shift distribution and bias network, and the transformer T₁The homonymous end of the second secondary coil is connected with the third output end of the input four-way differential phase-shift distribution and bias network, and the transformer T₁The non-homonymous end of the second secondary coil is connected with the fourth output end of the input four-path differential phase-shifting distribution and bias network. Connecting transformer T₁The middle tap of the first secondary coil and the second secondary coil passes through an inductor L₂Series resistance R₁Are interconnected, while the transformer T₁The middle tap of the first-stage coil is also connected with an inductor L₃Inductance L₃The other end of the capacitor is connected with a bypass grounding capacitor C₂And a gate voltage V_g1。

The beneficial effects of the further scheme are as follows: the input four-way differential phase-shifting distribution and bias network adopted by the invention can realize the power distribution of the input radio-frequency signal, can also carry out impedance matching and phase adjustment on the radio-frequency input signal, and simultaneously realizes the conversion from a single-ended signal to a differential signal, thereby ensuring the phase difference of the differential signal. The phase difference between the input end of the input four-path differential phase-shifting distribution and bias network and the signal phase of the first output end, the second output end, the third output end and the fourth output end is respectively 0 degree, 90 degrees, 180 degrees and 270 degrees, so that the signal phase difference between the first input end and the second input end of the first differential double-stacked amplifier and the second differential double-stacked amplifier is 180 degrees, and the relative phase difference between the input ports of the first differential double-stacked amplifier and the second differential double-stacked amplifier is 90 degrees, and the input phase difference similar to the Doherty amplifier is realized.

Furthermore, the first input end of the Nth differential double-stack amplifier is connected with a grounded capacitor C_pjAnd an inductance L_pj，L_pjThe other end of the resistor is connected with a grounding resistor R_pjAnd a transistor M_pjOf the grid electrode, M_pjSource of (3) is grounded, M_pjDrain electrode of (3) is connected with the transistor M_sjSource of (1), transistor M_sjThe grid of the capacitor is connected with a grounding capacitor C_sjAt the same time M_sjAnd M_pjAlso through a resistor R_sjConnection, M_sjIs connected with a feedback resistor R_mjAnd an inductance L_sjElectric powerResistance R_mjIs connected with M at the other end_sjGate of (1), inductor L_sjThe other end of the capacitor is connected with a grounding capacitor C_ujAnd the second input end of the Nth differential double-stack amplifier is connected with a grounded capacitor C in the same way as the first output end of the Nth differential double-stack amplifier_qjAnd an inductance L_qj，L_qjThe other end of the resistor is connected with a grounding resistor R_qjAnd a transistor M_qjOf the grid electrode, M_qjSource of (3) is grounded, M_qjDrain electrode of (3) is connected with the transistor M_tjSource of (1), transistor M_tjThe grid of the capacitor is connected with a grounding capacitor C_tjAt the same time M_tjAnd M_qjAlso through a resistor R_tjConnection, M_tjIs connected with a feedback resistor R_njAnd an inductance L_tjResistance R_njIs connected with M at the other end_tjGate of (1), inductor L_tjThe other end of the capacitor is connected with a grounding capacitor C_vjAnd a second output terminal of the Nth differential dual-stack amplifier, transistor M_tjAnd M_sjAlso through a capacitor R_ojAnd (3) interconnection, wherein N is one, two, three or four, and j =1, 2, 3 or 4. The first differential double-stacked amplifier and the third differential double-stacked amplifier work in a deep AB class amplification state, the second differential double-stacked amplifier and the fourth differential double-stacked amplifier work in a shallow C class amplification state, and the Doherty amplifier structure formed by the first differential double-stacked amplifier, the third differential double-stacked amplifier and the fourth differential double-stacked amplifier can remarkably improve the power amplification efficiency under high back-off power.

The beneficial effects of the further scheme are as follows: the design structure of the Nth differential double-stack amplifier adopts a differential amplifier structure, can inhibit the deterioration of high-frequency parasitic parameters of transistors on circuit indexes, and simultaneously can improve the power capacity and the power gain of a power amplifier and the output impedance and the load carrying capacity of the amplifier by adopting the double-stack amplifier structure.

Furthermore, the first and second input ends of the interstage four-way differential matching and biasing network are connected with a transformer T₂The third and fourth input ends of the interstage four-way differential matching and biasing network are connected with a transformer T₃Non-homonymous and homonymous terminals of the primary coilPressure device T₂Intermediate tap of primary coil and transformer T₃An inductor L is arranged between the middle taps of the primary coil₅Interconnection, simultaneous transformer T₂The middle tap of the primary coil is also connected with an inductor L₄Inductance L₄The other end of the capacitor is connected with a bypass grounding capacitor C₃And a drain voltage V_d1The first and second output ends of the interstage four-way differential matching and biasing network are connected with a transformer T₂The third and fourth input ends of the interstage four-way differential matching and biasing network are connected with a transformer T₃Non-homonymous and homonymous terminals of secondary winding, transformer T₂Center tap of secondary coil and transformer T₃An inductor L is arranged between the middle taps of the secondary coil₇Series resistance R₂Are interconnected, while the transformer T₂The middle tap of the secondary coil is also connected with an inductor L₆Inductance L₆The other end of the capacitor is connected with a bypass grounding capacitor C₄And a gate voltage V_g2。

The beneficial effects of the further scheme are as follows: the invention adopts the interstage four-way differential matching and the bias network to improve the interstage impedance matching of the amplifier, improve the gain and the efficiency of the power amplifier, optimize the power supply mode of the power amplifier and improve the circuit stability.

Furthermore, the first and second input ends of the output four-way differential phase-shift synthesis and bias network are connected with the transformer T₄The third and fourth input ends of the output four-path differential phase-shift synthesis and bias network are connected with a transformer T₄Non-dotted and dotted terminals of the second secondary winding, transformer T₄An inductor L is arranged between the middle taps of the first secondary coil and the second secondary coil₈Interconnection, transformer T₄The middle tap of the first secondary coil is also connected with an inductor L₉，L₉The other end of the capacitor is connected with a bypass grounding capacitor C₅And a drain bias voltage V_d2Transformer T₄Primary coil's dotted terminal connection inductance L₁₀And a ground capacitor C₆Inductance L₁₀Is connected with the output four at the other endThe output end of the path difference phase-shift synthesis and bias network, and the transformer T₄The non-dotted terminal of the primary coil of (a) is grounded.

The beneficial effects of the further scheme are as follows: the output four-way differential phase-shifting synthesis and bias network adopted by the invention not only can realize the power synthesis of four-way differential radio-frequency signals, but also can convert the four-way differential signals into single-ended signals, has small insertion loss and simultaneously ensures the output power and efficiency of the amplifier.

Drawings

FIG. 1 is a schematic block diagram of a power amplifier of the present invention;

fig. 2 is a circuit diagram of a power amplifier according to the present invention.

Detailed Description

Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It is to be understood that the embodiments shown and described in the drawings are merely exemplary and are intended to illustrate the principles and spirit of the invention, not to limit the scope of the invention.

The embodiment of the invention provides a radio frequency power amplifier for communication of internet of vehicles, which comprises an input four-way differential phase-shifting distribution and bias network, a first differential double-stacked amplifier, a second differential double-stacked amplifier, a third differential double-stacked amplifier, a fourth differential double-stacked amplifier, an interstage four-way differential matching and bias network and an output four-way differential phase-shifting synthesis and bias network.

As shown in fig. 1, the input end of the input four-way differential phase shift distribution and bias network is the input end of the whole power amplifier, the first and third output ends thereof are connected to the first and second input ends of the first differential dual-stacked amplifier, the second and fourth output ends thereof are connected to the first and second input ends of the second differential dual-stacked amplifier, and the input end of the input four-way differential phase shift distribution and bias network has signal phases different from the first, second, third and fourth output ends by 0 degree, 90 degree, 180 degree and 270 degree, respectively;

the first output end and the second output end of the first differential double-stack amplifier are connected with the first input end and the second input end of the interstage four-way differential matching and biasing network; the first output end and the second output end of the second differential double-stack amplifier are connected with the third input end and the fourth input end of the interstage four-way differential matching and biasing network;

the first and second input ends of the third differential double-stacked amplifier are connected with the first and second output ends of the interstage four-way differential matching and biasing network, and the first and second output ends of the third differential double-stacked amplifier are connected with the first and third output ends of the output four-way differential phase-shifting synthesis and biasing network; the first and second input ends of the fourth differential double-stacked amplifier are connected with the third and fourth output ends of the interstage four-way differential matching and biasing network, the first and second output ends of the fourth differential double-stacked amplifier are connected with the second and fourth output ends of the output four-way differential phase-shifting synthesizing and biasing network, and the phase difference between the output end of the output four-way differential phase-shifting synthesizing and biasing network and the signal phase difference between the output end of the output four-way differential phase-shifting synthesizing and biasing network and the first, second, third and fourth input ends is 270 degrees, 180 degrees, 90 degrees and 0 degree respectively;

the output end of the output four-way differential phase-shift synthesis and bias network is the output end of the whole power amplifier.

As shown in FIG. 2, the input end of the input four-way differential phase-shift distribution and bias network is connected with an inductor L₁Inductance L₁The other end of the transformer is connected with a coupling transformer T₁Dotted terminal of primary coil and grounding capacitor C₁Transformer T₁The non-homonymous end of the primary coil of (1) is grounded; transformer T₁The same-name end of the first secondary coil is connected with the first output end of the input four-way differential phase-shift distribution and bias network, and the transformer T₁The non-homonymous end of the first secondary coil is connected with the second output end of the input four-way differential phase-shift distribution and bias network, and the transformer T₁The homonymous end of the second secondary coil is connected with the third output end of the input four-way differential phase-shift distribution and bias network, and the transformer T₁The non-homonymous end of the second secondary coil is connected with the fourth output end of the input four-path differential phase-shifting distribution and bias network. Connecting transformer T₁The middle tap of the first secondary coil and the second secondary coil passes through an inductor L₂Series resistance R₁Are interconnected, while the transformer T₁The middle tap of the first-stage coil is also connected with an inductorL₃Inductance L₃The other end of the capacitor is connected with a bypass grounding capacitor C₂And a gate voltage V_g1。

The first input end of the Nth differential double-stack amplifier is connected with a grounding capacitor C_pjAnd an inductance L_pj，L_pjThe other end of the resistor is connected with a grounding resistor R_pjAnd a transistor M_pjOf the grid electrode, M_pjSource of (3) is grounded, M_pjDrain electrode of (3) is connected with the transistor M_sjSource of (1), transistor M_sjThe grid of the capacitor is connected with a grounding capacitor C_sjAt the same time M_sjAnd M_pjAlso through a resistor R_sjConnection, M_sjIs connected with a feedback resistor R_mjAnd an inductance L_sjResistance R_mjIs connected with M at the other end_sjGate of (1), inductor L_sjThe other end of the capacitor is connected with a grounding capacitor C_ujAnd the second input end of the Nth differential double-stack amplifier is connected with a grounded capacitor C in the same way as the first output end of the Nth differential double-stack amplifier_qjAnd an inductance L_qj，L_qjThe other end of the resistor is connected with a grounding resistor R_qjAnd a transistor M_qjOf the grid electrode, M_qjSource of (3) is grounded, M_qjDrain electrode of (3) is connected with the transistor M_tjSource of (1), transistor M_tjThe grid of the capacitor is connected with a grounding capacitor C_tjAt the same time M_tjAnd M_qjAlso through a resistor R_tjConnection, M_tjIs connected with a feedback resistor R_njAnd an inductance L_tjResistance R_njIs connected with M at the other end_tjGate of (1), inductor L_tjThe other end of the capacitor is connected with a grounding capacitor C_vjAnd a second output terminal of the Nth differential dual-stack amplifier, transistor M_tjAnd M_sjAlso through a capacitor R_ojAnd (3) interconnection, wherein N is one, two, three or four, and j =1, 2, 3 or 4. The first and third differential dual-stacked amplifiers operate in a deep class AB amplification state, and the second and fourth differential dual-stacked amplifiers operate in a shallow class C amplification state.

The first and second input ends of the interstage four-way differential matching and biasing network are connected with a transformer T₂The same of the primary coilThe third and fourth input ends of the interstage four-way differential matching and biasing network are connected with a transformer T₃Non-dotted terminal and dotted terminal of primary coil, transformer T₂Intermediate tap of primary coil and transformer T₃An inductor L is arranged between the middle taps of the primary coil₅Interconnection, simultaneous transformer T₂The middle tap of the primary coil is also connected with an inductor L₄Inductance L₄The other end of the capacitor is connected with a bypass grounding capacitor C₃And a drain voltage V_d1The first and second output ends of the interstage four-way differential matching and biasing network are connected with a transformer T₂The third and fourth input ends of the interstage four-way differential matching and biasing network are connected with a transformer T₃Non-homonymous and homonymous terminals of secondary winding, transformer T₂Center tap of secondary coil and transformer T₃An inductor L is arranged between the middle taps of the secondary coil₇Series resistance R₂Are interconnected, while the transformer T₂The middle tap of the secondary coil is also connected with an inductor L₆Inductance L₆The other end of the capacitor is connected with a bypass grounding capacitor C₄And a gate voltage V_g2。

The first and second input ends of the output four-way differential phase-shift synthesis and bias network are connected with a transformer T₄The third and fourth input ends of the output four-path differential phase-shift synthesis and bias network are connected with a transformer T₄Non-dotted and dotted terminals of the second secondary winding, transformer T₄An inductor L is arranged between the middle taps of the first secondary coil and the second secondary coil₈Interconnection, transformer T₄The middle tap of the first secondary coil is also connected with an inductor L₉，L₉The other end of the capacitor is connected with a bypass grounding capacitor C₅And a drain bias voltage V_d2Transformer T₄Primary coil's dotted terminal connection inductance L₁₀And a ground capacitor C₆Inductance L₁₀The other end of the output four-way differential phase-shift synthesis and bias network is connected with the output end of the output four-way differential phase-shift synthesis and bias network and a transformer T₄The non-dotted terminal of the primary coil of (a) is grounded.

The specific working principle and process of the present invention are described below with reference to fig. 2:

radio frequency input signal through input terminal RF_inThe input circuit is used for carrying out impedance transformation matching through an input four-way differential phase-shifting distribution and bias network, and then simultaneously enters the input ends of the first and second differential double-stacked amplifiers in the form of differential signals with equal power.

1) When the power of the differential signal is lower than the saturated input power point of the first differential double-stacked amplifier, only the first and third differential double-stacked amplifiers work at the moment, an output signal exists, the second and fourth differential double-stacked amplifiers do not work, no output signal exists, the output end of the first differential double-stacked amplifier outputs a radio frequency signal, the radio frequency signal enters an interstage four-way differential matching and biasing network for impedance conversion matching, the radio frequency signal enters the input end of the third differential double-stacked amplifier, the radio frequency signal enters an output four-way differential phase-shifting synthesizing and biasing network after being amplified by power, the differential signal is converted into a single-ended signal, and the single-ended signal is transmitted from the output end to the RF_outOutputting;

2) when the power of the differential signal is higher than the saturated input power point of the first differential double-stacked amplifier, the first to fourth differential double-stacked amplifiers work, the output ends of the first and second differential double-stacked amplifiers output four paths of radio frequency signals, respectively enter an interstage four-path differential matching and biasing network for impedance conversion matching, respectively enter the input ends of the third and fourth differential double-stacked amplifiers, respectively enter an output four-path differential phase-shifting synthesis and biasing network after power amplification, convert the four paths of differential signals into single-ended signals after power synthesis, and then convert the single-ended signals from the output ends of the RF amplifier_outAnd (6) outputting.

Based on the circuit analysis, the difference between the radio frequency power amplifier for the vehicle networking communication and the traditional amplifier structure based on the integrated circuit process is that the core architecture adopts a structure of a differential double-stack amplifier and a transformer, which realizes the working mode equivalent to the Doherty power amplifier:

the differential dual-stack amplifier is different from the conventional single transistor in structure, and is not described herein;

the differential dual stack amplifier differs from the Cascode differential amplifier in that: the stacked grid compensation capacitor of the common grid tube of the Cascode transistor is a capacitor with a larger capacitance value and is used for realizing alternating current grounding of the grid, and the grid of the differential double-stacked amplifier is a matching capacitor with a smaller capacitance value, so that the synchronous swing of the grid voltage is realized, the circuit breakdown voltage is improved, and the impedance matching of the transistors among the stacks is improved;

the amplifier with the Doherty structure is realized by utilizing the differential double-stack amplifier, and compared with the traditional single-ended amplifier structure, the suppression characteristic of the circuit on parasitic parameters can be obviously improved, and the high-frequency circuit index is improved.

In the whole radio frequency power amplifier aiming at the communication of the Internet of vehicles, the size of a transistor and the sizes of other resistors and capacitors are determined after the gain, the back-off efficiency, the output power and other indexes of the whole circuit are comprehensively considered, and through the layout design and the reasonable layout in the later period, the required indexes can be better realized, and the high-power output capacity, the high-back-off efficiency, the high-power gain and the good input-output matching characteristic are realized.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.