Broadband Doherty power amplifier with continuous inverse class F and class J mixed

Abstract

The invention provides a broadband Doherty power amplifier with continuous inverse class F and class J mixed. The broadband Doherty power amplifier comprises a broadband Wilkinson power divider, a phase compensation line, a carrier power amplification circuit, a peak power amplification circuit and a broadband post-matching circuit. The carrier power amplification circuit comprises a carrier broadband input matching circuit, a carrier amplifier transistor and an impedance converter; the peak power amplification circuit comprises a peak broadband input matching circuit, a peak amplifier transistor, a peak harmonic control / suppression network, a peak fundamental wave tuning network and a reverse phase compensation line; and the broadband post-matching circuit comprises a carrier harmonic control network and a post-matching tuning network. The carrier amplifier works in a continuous inverse class F mode when input power is saturated, works in a class J mode when input power is back-off by 6dB, and the peak amplifier works in a continuous inverse class F mode when input power is saturated and does not work when input power is back-off by 6dB.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a continuous inverse Class F and Class J mixed broadband Doherty power amplifier and a design method thereof. Background technique [0002] With the rapid development of wireless communication technology, radio frequency microwave technology is becoming more and more important in people's daily life. In order to transmit as much data as possible within a limited spectrum bandwidth, communication providers usually use very complex modulation methods, which will lead to a larger peak-to-average ratio (PAPR) of the signal, while using traditional power amplifiers such as class A, Class AB is very inefficient for amplifying non-constant envelope signals, especially at high power backoffs. The RF power amplifier with high efficiency and high linearity has become one of the research hotspots in academia and industry. Doherty power amplifiers have become the main...

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Problems solved by technology

[0004] In order to improve the bandwidth of the Doherty power amplifier, the impedance transformation ratio of the quarter-wavelength line is usually reduced to reduce its quality factor, but it is mainly aimed at the fundamental wave impedance. The problem brought about by this is the frequency band Edges perform much worse than center frequencies

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