Microwave predistortion linearizer

Details Microwave predistortion linearizer Microwave predistortion linearizer

1994-10-13

1996-06-04

Mullins, James B.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330307, 333104, H03F 126

Patent

active

055237169

ABSTRACT:
A predistortion linearizer (10) and method for distorting an AC input signal (42) to a power amplifier (24) provide a distortion to the input signal which is complementary to a distortion, in terms of gain and phase, introduced by the power amplifier as a function of signal amplitude, thereby to linearize the power amplifier. The linearizer includes a switching circuit (26, Z.sub.1 28, Z.sub.2) having an input terminal (16) and an output terminal (20) and a pair of antiparallel diodes (26, 28) connected between the input terminal and the output terminal of the switching circuit. The linearizer has also an impedance circuit (Z.sub.3) comprising solely passive electrical elements connected between the input terminal and the output terminal of the switching circuit, wherein elements of the impedance circuit have values selected to introduce the complementary distortion to the input signal as a function of amplitude of the input signal to linearize the power amplifier.

REFERENCES:
patent: 2999986 (1961-09-01), Holbrook
patent: 4255724 (1981-03-01), Bergero
patent: 4902983 (1990-02-01), Fujiki et al.
patent: 5038113 (1991-08-01), Katz et al.
patent: 5138275 (1992-08-01), Abbiati et al.

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