Millimeter wave power amplifier for automobile radar transceiver

Abstract

The invention discloses a millimeter wave power amplifier for an automobile radar transceiver. The millimeter wave power amplifier comprises an input pre-distortion linear differential amplification network, a first final-stage high-power amplification network, a second final-stage high-power amplification network and an output differential-to-single-ended matching network; the core architecture of the invention adopts a two-path synthesized final-stage high-power amplification network which has the characteristics of high power, high efficiency and high gain in a millimeter wave frequency band; and meanwhile, the high-frequency parasitic parameter suppression characteristic of the differential amplification structure is utilized, and the analog pre-distortion linearization technology of the input pre-distortion linearization differential amplification network is combined, so that the whole power amplifier obtains good high gain, high efficiency, high linearity and high power output capability in the frequency band of automobile radar application.

Description

technical field [0001] The invention relates to the fields of field effect transistor radio frequency power amplifiers and integrated circuits, in particular to a high-power, high-efficiency, and high-linearity power amplifier applied to a transceiver transmitting module of an automotive radar system. Background technique [0002] With the rapid development of automotive radar systems and RF microwave circuits, automotive radar RF front-end transceivers are also developing in the direction of high performance, high integration, and low power consumption. Therefore, the market urgently needs the power amplifiers of automotive radar transmitters to have high output power, high linearity, high gain, high efficiency, and low cost. However, when the integrated circuit technology is used to design and realize the power amplifier chip circuit of the automotive radar system, its performance is subject to certain constraints, mainly reflected in: [0003] (1) High power and high eff...

AI Technical Summary

Problems solved by technology

[0003] (1) High power and high efficiency capabilities are limited: Traditional power amplifiers use a multi-channel parallel combination structure or a distributed structure. The combination efficiency of these two structures is limited, resulting in part of the power loss in the combination network, which limits high power. , high efficiency capability

[0004] (2) Limited linearity index and high efficiency capability: Traditional power amplifiers are affected by the parasitic nonlinear capacitance of transistors, especially when working close to saturation, the linearity index is low, so power backoff is often required to sacrifice high power Output capacity and high efficiency indicators to improve linearity indicators

[0005] The typical method of high power, high efficiency and high linearity amplifier is to use digital predistortion combined with Doherty power amplifier structure, but this method also has certain limitations. Traditional digital predistortion combined with Doherty power amplifier structure is used in automotive radar systems In the frequency band, it is often limited by the parasitic parameters of the transistor and the bandwidth of the digital pre-distortion system, and the improvement of linearity and efficiency is relatively limited. At the same time, its circuit structure is relatively complicated, which is not conducive to low-cost indicators

At the same time, when implementing frequency band amplifiers for automotive radar systems based on traditional single transistor structures or Cascode transistors, the gain is often low. If the traditional analog predistortion method is used, a certain gain needs to be sacrificed to improve linearity, which is even worse. Gain metrics for such solutions

[0006] It can be seen from this that the difficulties in the design of high-power, high-efficiency, and high-linearity amplifiers for automotive radar system applications based on integrated circuit technology are: high power and high efficiency output is difficult; linearity indicators and high efficiency capabilities are limited and there are many limitations sex

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