Non-linear compensation circuit for a power amplifier

Details Non-linear compensation circuit for a power amplifier Non-linear compensation circuit for a power amplifier

1996-08-26

1998-09-01

Britton, Howard

Telecommunications

Transmitter

With feedback of modulated output signal

330107, H04B 138, H04B 104

Patent

active

058024514

ABSTRACT:
In a radio communication device which includes at least a modulator, a power amplifier, a demodulator, and a carrier oscillator wherein an input signal to the radio communication device is corrected with a feedback demodulated signal to compensate for possible non-linear distortions in the power amplifier, a phase shift quantity for correction of the phase of the carrier which demodulates the feedback modulated signal in the demodulator is separated into a fixed phase quantity and a variable phase quantity smaller than the fixed phase quantity. The carrier is phase-corrected such that a phase shifter shifts the phase of the carrier by the fixed phase quantity and a second phase shifter shifts the phase of the carrier by the variable phase quantity smaller than the fixed phase quantity.

REFERENCES:
patent: 5483681 (1996-01-01), Bergsten
patent: 5564087 (1996-10-01), Cygan
patent: 5574992 (1996-11-01), Cygan
patent: 5675286 (1997-10-01), Baker
patent: 5699383 (1997-12-01), Ichiyoshi
Transmitter Linearization using Catresian Feedback forLinear DTMA Modulation, IEEE Vehicular Technology Conference, 1991, pp. 439-444.

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