A doherty power amplifier with improved power back-off dynamic range and its implementation method

Abstract

The present invention provides a Doherty power amplifier with improved power back-off dynamic range and its implementation method, including an equalized Wilkinson power divider, a carrier power amplifier circuit, a peak power amplifier circuit and a novel load modulation network, wherein the equalized power The Erkinson power divider is used to divide the input power into equal parts and then output them to the carrier power amplifier circuit and the peak power amplifier circuit respectively. The output terminals of the amplifying circuit are connected to output the combined power to the load. Compared with the prior art, the invention improves the load modulation network of the traditional Doherty power amplifier, increases the load impedance of the main power amplifier under low input power state, and improves the high-efficiency power back-off range of the Doherty power amplifier.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a Doherty power amplifier for improving the dynamic range of power back-off and a realization 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...

AI Technical Summary

Problems solved by technology

[0004] In order to increase the power fallback range of Doherty power amplifiers, communication providers generally use asymmetric transistors, that is, the peak power amplifier uses a tube with a larger power capacity, and at the same time uses an unequal power divider at the input end to improve the power fallback range, but this introduces new problems, such as reduced overall Doherty amplifier gain, reduced power utilization factor, etc., especially at low input power

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