Analog predistorter with field-effect transistor connected in series with reflection-type Schottky diode

Abstract

The invention discloses an analog predistorter of a field effect transistor series connection type Schottky diode, and the analog predistorter comprises a first bias circuit, a second bias circuit, a third bias circuit, a Schottky diode and a field effect transistor; the first bias circuit performs predistortion by using nonlinearity generated by the Schottky diode and adopting a bias voltage control mode; the second bias circuit and the third bias circuit respectively perform pre-distortion by using nonlinearity generated by the field effect transistor, the first bias circuit performs pre-distortion processing on a radio frequency original signal RFin to generate a first distortion signal V1(t), and the second bias circuit performs pre-distortion processing on the first distortion signal V1(t) by adopting a mode of controlling grid voltage of the field effect transistor, and generates a second distortion signal V2(t); the third bias circuit generates a second distortion signal V2(t), and the third bias circuit carries out pre-distortion processing on the second distortion signal V2(t) by adopting a mode of controlling the drain voltage of the field effect transistor. The analog predistorter has the advantages of simple structure, small size, low cost, easiness in operation and implementation, and higher predistortion precision when acting on a broadband modulation 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. Entertainment methods and other aspects are increasingly demanding, and it can 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 and orthogonal frequency division multiplexing (OFDM) digital modulation method has greatly improved the spectrum utilization rate. At the same time, the communication bandwidth...

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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