Two-path adjustable analog predistorter

Abstract

The invention discloses a two-path adjustable analog predistorter, which comprises an isolated direct current circuit, a first power divider circuit, a second power divider circuit, a first biasing circuit, a second biasing circuit, a phase change circuit and a nonlinear generation circuit, the first power divider circuit averagely distributes a radio frequency original signal RFin input to the first power divider circuit and then generates two paths of signal outputs, and the nonlinear generation circuit performs pre-distortion in a bias voltage control mode by using nonlinearity generated by a Schottky diode in the nonlinear generation circuit to generate a nonlinear signal and outputs the nonlinear signal to the second power divider circuit; the phase change circuit is matched with an internal resistor in a bias voltage control mode, so that the phase of a signal transmitted to the phase change circuit is changed and then is output to the second power divider circuit, and the second power divider performs power combination on signals at a first output end and a second output end of the second power divider circuit to generate an analog pre-distortion output signal RFout; the amplifier has the advantages that the gain and the phase can be adjusted respectively, and independent requirements of different power amplifiers on the gain and the phase are met.

Description

technical field [0001] The invention relates to an analog predistorter, in particular to a two-way adjustable analog predistorter. Background technique [0002] With the continuous development of communication systems, the fifth-generation mobile communication system (5G) technology has higher requirements for RF power amplifiers in terms of power consumption, delay and bandwidth. As the core module of the signal transmitter, the RF power amplifier's linearity determines the transmission quality of the communication technology system. However, because the power amplifier itself is a nonlinear device, its nonlinearity will produce both out-of-band spurious radiation and in-band signal interference, so the power amplifier must be linearized. [0003] At present, the linearization technology mainly adopts digital predistortion (DPD) technology and analog predistortion (APD) technology. Analog predistortion technology is an early linearization technology. It has simple structu...

AI Technical Summary

Problems solved by technology

However, the multi-channel analog predistorter based on Schottky diodes is related to the change of gain and phase, and cannot meet the independent requirements of different power amplifiers for gain and phase

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