Method of compensating for distortion in an amplifier

Details Method of compensating for distortion in an amplifier Method of compensating for distortion in an amplifier

1996-11-12

1998-04-28

Mullins, James B.

Amplifiers

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

375297, 455126, H03F 132

Patent

active

057450064

ABSTRACT:
A method of providing compensation for distortion imparted to an input signal, principally by an amplifier (18), compares a delayed version of the input signal (34) to the amplifier's output signal. The result of the comparison is an error signal that is fed back to minimize distortion. This feedback technique is applied to a transmitter (10) in combination with predistortion that is selected to compensate for at least some of the distortion provided by the transmitter's output amplifier (18). The remainder of the compensation is provided by the error signal which can be generated by a relatively low gain analog feedback loop.

REFERENCES:
patent: 4700151 (1987-10-01), Nagata
patent: 5049832 (1991-09-01), Cavers
patent: 5148448 (1992-09-01), Karam et al.
Cavers, Amplifier Linearization Using a Digital Predistorter with Fast Adaption and Low Memory Requirements, IEEE Transactions on Vehicular Technology, vol. 39, No. 4, Nov. 1990 pp. 374-392.
Saleh and Salz, Adaptive Linearization of Power Amplifiers in Digital Radio Systems, The Bell System Technical Journal, Apr. 1983, pp. 1019-1033.

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