A kind of analog predistorter of FET series reflection Schottky diode

Abstract

The invention discloses an analog predistorter of a field effect transistor connected in series with a reflective Schottky diode, comprising a first bias circuit, a second bias circuit, a third bias circuit, a Schottky diode and a field effect transistor, The first bias circuit utilizes the nonlinearity generated by the Schottky diode itself to perform predistortion by controlling the bias voltage. The second bias circuit and the third bias circuit utilize the nonlinearity generated by the FET itself to perform predistortion. Distortion, the first bias circuit performs pre-distortion processing on the original radio frequency signal RFin to generate a first distorted signal V 1 (t), the second bias circuit controls the gate voltage of the FET to the first distortion signal V 1 (t) Perform pre-distortion processing to generate a second distorted signal V 2 (t), the third bias circuit controls the drain voltage of the FET to the second distortion signal V 2 (t) Perform predistortion processing; the advantages are simple structure, small volume, low cost, easy operation and realization, and high predistortion precision when acting on a broadband modulated signal.

Description

technical field [0001] The invention relates to an analog predistorter, in particular to an analog predistorter with field effect transistors connected in series with reflective Schottky diodes. Background technique [0002] The fifth-generation mobile communication technology (5G) Sub-6GHz frequency band has been put into commercial use. 5G communication technology has the characteristics of high data rate, low delay, large system capacity and large-scale equipment connection, which can not only meet the needs of consumers for communication quality, It can meet the increasingly high requirements in terms of entertainment and other aspects, and can also meet the communication requirements of high-tech industries such as the Internet of Things, autonomous driving, and telemedicine. [0003] The application of new technologies such as multiple-input multiple-output (MIMO) antenna diversity technology, orthogonal frequency division multiplexing (OFDM) digital modulation method,...

AI Technical Summary

Problems solved by technology

However, the internal Schottky diode will greatly suppress the even-order harmonics in the nonlinear signal generated by itself, which leads to its excellent performance in improving the third-order intermodulation distortion of traditional narrow-band modulation signals. However, when it is used for the most widely used wideband modulation signal, the predistortion accuracy is very poor, so that its application field is greatly limited.

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