Nonlinearity generator using FET source-to-drain conductive path

Details Nonlinearity generator using FET source-to-drain conductive path Nonlinearity generator using FET source-to-drain conductive path

1989-12-01

1991-08-06

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including field effect transistor

307497, H03F 316

Patent

active

050381130

ABSTRACT:
A distortion generator uses the source-to-drain conductive path of a FET as the nonlinear element, in either a reflective or transmissive mode. In the reflective mode, the signal is applied across the source-to-drain conductive path, and in the transmissive mode the source-to-drain conductive path is in series with the transmission path. The FET may be biased, and the gate impedance to reference potential aids in selecting the nonlinearity characteristic. Reflective embodiments of a predistortion equalizer include a circulator version and a 3 dB hybrid splitter version. Transmissive embodiments include a direct series embodiment, and another with a 3 dB splitter and a separator combiner. Limiter and log-amp uses are described.

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