Broadband high-efficiency Doherty power amplifier and design method thereof

Abstract

The invention discloses a broadband high-efficiency Doherty power amplifier and a design method thereof. The relative bandwidth of an existing Doherty power amplifier is usually limited to be 50% or below, and the performance is obviously degraded at the edge of a frequency band. The broadband high-efficiency Doherty power amplifier comprises a power divider, a carrier power amplifying circuit, apeak power amplifying circuit, a post-matching network and an output resistor. The carrier power amplifying circuit comprises a carrier input matching network, a carrier power amplifier, a carrier output fundamental wave matching network and a carrier power amplifier compensation line. The peak power amplifying circuit comprises a peak value input matching network, a peak power amplifier, a peak value output fundamental wave matching network and a peak power amplifier compensation line. The post-matching network comprises a first micro-strip line, a second micro-strip line, a third micro-stripline, a fourth micro-strip line, a fifth micro-strip line and a sixth micro-strip line. The broadband high-efficiency Doherty power amplifier eliminates the bandwidth limit caused by a high-order matching network.

Description

technical field [0001] The invention belongs to the technical field of power amplifiers, in particular to a wideband and high-efficiency hybrid continuous Doherty power amplifier. 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 that realizes both high efficiency and high linearity at a relatively high bandwidth has become one of the research hotspots in academia and industry. Doherty power amplifiers have become the mainstre...

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Problems solved by technology

Unfortunately, however, attempts to simply replace the conventional Class AB amplifiers in Doherty with continuous-mode amplifiers did not achieve the desired results due to the conflict between harmonic tuning and fundamental wave delay, and improving Doherty's bandwidth and efficiency is critical to enabling communication Better coverage of frequency bands and energy-saving and high-efficiency of base stations are very important, and they are also key issues that need to be solved urgently

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