Transmitter with improved linear amplifier control

Details Transmitter with improved linear amplifier control Transmitter with improved linear amplifier control

1989-05-09

1991-06-11

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

331 14, H04B 104

Patent

active

050239376

ABSTRACT:
A linear power amplifier is included in a RF transmitter. A mechanism is provided for generating a predistorted input signal to the PA so that nonlinear phase and amplitude characteristics of the PA will be compensated. Another means is provided for generating a feedback signal to the predistortion generating mechanism so that the feedback signal is based on the output of the PA when the predistortion circuit is locked and is based upon the input signal to the PA when the predistortion generating circuit is unlocked. Undesired emissions from the power amplifier are inhibited when the predistortion mechanism is unlocked.

REFERENCES:
patent: 4035727 (1977-07-01), Ishii
patent: 4639938 (1987-01-01), Kennett
patent: 4933986 (1990-06-01), Leitch

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