Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2007-07-10
2007-07-10
Lee, Benny (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C330S278000, C330S107000
Reexamination Certificate
active
11063998
ABSTRACT:
A distortion compensating circuit for a power amplifier attains raised compensating accuracy with shorter convergence time by accurately and quickly generating a distortion compensation signal for pre-distortion. An error signal representing the difference between the input and output signals of the power amplifier is generated. From the error signal and the input signal, the coefficients of the third-order intermodulation distortion, fifth-order intermodulation distortion and seventh-order intermodulation distortion are calculated. According to these coefficients, a distortion compensating signal which is characteristically opposite in phase and gain to the intermodulation distortions is generated.
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Hirose Nobuo
Murata Nobuo
Tada Yasutoshi
Tsukamoto Nobuo
Hitachi Kokusai Electric Inc.
Lee Benny
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Wong Alan
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