Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1997-06-30
2000-06-27
Mottola, Steven J.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
375297, H03F 126
Patent
active
060811587
ABSTRACT:
An adaptive apparatus for compensating the non-linear distorting action of an amplifier in a transmission system. I-channel and Q-channel memories store a plurality of digital pre-distortion correction values. The memories are addressed using a predetermined number of significant bits of an incoming, original information signal to retrieve I-channel and Q-channel pre-distortion correction values. The I-channel and Q-channel pre-distortion correction values are combined, digitally, with I-channel and Q-channel components of the original information signal to pre-distort the original information signal. The pre-distorted signal, in real format, is supplied to the amplifier, and a feed-back sample signal is coupled-off of the output of the amplifier. A comparison is made between the original information signal and the feed-back sample signal in digital format and in the complex domain (I/Q). In response to the comparison, the pre-distortion correction values (I/Q) in the memory means are modified.
REFERENCES:
patent: 4291277 (1981-09-01), Davis et al.
patent: 5486789 (1996-01-01), Palandech et al.
Davis Robert C.
Twitchell Edwin Ray
Harris Corporation
Mottola Steven J.
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