Cascode power amplifier with improved efficiency and linearity

Abstract

The invention discloses a Cascode power amplifier with improved efficiency and linearity, comprising a Cascode structure, an input matching network and an output matching network, wherein the Cascode structure is composed of a grounded-emitter transistor and a grounded base transistor; the input matching network is connected between the signal input port of the power amplifier and the base electrode of the grounded-emitter transistor; the output matching network is connected between the collector electrode of the grounded base transistor and the signal output port of the power amplifier; a first series-parallel resonant network is connected between the collector electrode of the grounded-emitter transistor and the ground; a second series-parallel resonant network is connected between the base electrode of the grounded base transistor and the ground; a secondary harmonic series resonant network is connected between the collector electrode of the grounded base transistor and the ground; a third harmonic parallel resonant network is connected between the collector electrode of the grounded base transistor and the output port. The invention can effectively inhibit even harmonic in the power amplifier output, improves the linear degree of the power amplifier and improves the output power of the power amplifier and the additional efficiency of the power by high-order odd harmonic.

Description

technical field [0001] The invention relates to a Cascode power amplifier with improved efficiency and linearity. Background technique [0002] The power amplifier is one of the key modules in the wireless communication system. It is used to amplify the radio frequency signal and reach a certain output power, and then send it to the antenna for transmission. Its line efficiency and linearity have always been the focus of attention and research. [0003] The power amplifier is the most energy-consuming module in the wireless communication transmission system, so the efficiency is an important indicator that should be considered first when designing the power amplifier. For high-power wireless communication transmission systems such as base stations and radars, improving efficiency can reduce power consumption It is in line with the trend of today's global low-carbon economy. For handheld terminal devices such as mobile phones, improving efficiency means longer talk time and s...

AI Technical Summary

Problems solved by technology

However, the linearization performance of feedforward technology depends on the precise matching of signal amplitude and phase, and a delay line is needed to achieve phase matching, so it will introduce loss and is not easy to integrate; feedback technology is not easy to increase the loop gain at high frequencies, At the same time, there are serious stability problems, so they mostly work at low frequencies. The loop contains a frequency conversion network, and its high-frequency path introduces considerable phase shift. Therefore, this technology needs to be compensated during demodulation. The control of phase shift is a Difficulties, the design will be greatly limited; the technical difficulty of envelope elimination and recovery is that the delay of low-frequency and high-frequency signals must be consistent; the memory effect of the power amplifier will make the realization of the pre-distortion algorithm difficult

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