Dual-mode matching irregular structure Doherty power amplifier based on reflection coefficient circle optimization

Abstract

The invention discloses a dual-mode matching irregular structure Doherty power amplifier based on reflection coefficient circle optimization. The dual-mode matching irregular structure Doherty power amplifier comprises a coupler, a carrier amplification circuit, a peak amplification circuit, an irregular structure carrier dual-mode output matching network, an irregular structure peak dual-mode output matching network and a combining load. The uplink signal output end of the coupler is sequentially connected with a carrier phase compensation line, a carrier input matching network, a carrier transistor and an irregular structure carrier dual-mode output matching network in the carrier amplifying circuit; and the lower signal output end of the coupler is sequentially connected with a peak phase compensation line, a peak input matching network, a peak transistor and an irregular structure peak dual-mode output matching network in the peak amplification circuit. And the output ends of the carrier amplification circuit and the peak amplification circuit are directly connected with the combining load. A Doherty power amplifier is designed by combining a dual-mode matching network optimization method based on a reflection coefficient circle with an irregular structure, and broadband and high-efficiency working characteristics are realized.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a dual-mode matching irregular structure Doherty power amplifier based on reflection coefficient circle optimization. Background technique [0002] In response to the increasing demand for high transmission data rates, such as the fifth generation mobile communication network (5G) and future wireless communication systems, peak-to-average ratio and wideband modulation signals are commonly used. To effectively amplify these signals within the power back-off range, Doherty power amplifiers have attracted great attention from academia and industry due to their significant efficiency enhancement and easy configuration. In order to improve the optimization efficiency of the output matching network, the optimization objective function selection strategy of the existing Doherty power amplifier output matching network is usually to determine the impedance error value based on the e...

AI Technical Summary

Problems solved by technology

In traditional design methods, a simple optimization objective function based on the absolute value of the impedance error is usually used, and the obtained target impedance area is as follows: figure 2 It can be seen from the figure that the target impedance area obtained by optimizing the objective function based on the absolute value of the impedance error cannot completely cover the optimal load impedance area obtained by load pulling

[0004] To sum up, the research on Doherty power amplifiers with traditional regular structure shows that the λ / 4 impedance transformation line used in the existing Doherty power amplifiers realizes load modulation, and the output matching network usually can only achieve saturation mode when designing Impedance matching cannot take into account the impedance matching requirements during power back-off, which reduces the efficiency of power back-off

The above problems can be improved by compensation lines, but the compensation lines will introduce additional phase dispersion, which limits the operating bandwidth

At the same time, the existing target impedance strategy and topology have limitations on the bandwidth, which is difficult to meet the needs of Doherty power amplifier optimization design

Images