Distortion detection for a power amplifier

Details Distortion detection for a power amplifier Distortion detection for a power amplifier

2005-09-27

2005-09-27

Choe, Henry (Department: 2817)

Amplifiers

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

C330S136000

Reexamination Certificate

active

06949975

ABSTRACT:
The input and output of amplifier (110) are sampled and downconverted in frequency and filtered at (124and126) to produce sub-band signals. The input signal sub-band (134) is then subtracted from the output signal sub-band (136) at (130) to produce a residual signal (132) containing any distortion present in the sub-band selected by the downconversion oscillator (128). Signal analyser (158) compares the input and output signal energy to deduce the amount of distortion in the output signal, to provide signals for controlling a distortion reduction mechanism such as a predistorter operating on amplifier (110). Alternatively, the input signal sub-band (134) and the output signal sub-band (136) are Fourier transformed (210and212) to produce spectrums which can be analysed to determine the presence of distortion in the output of amplifier (110).

REFERENCES:
patent: 4412185 (1983-10-01), Gerard
patent: 5594385 (1997-01-01), Anvari
patent: 6246286 (2001-06-01), Persson
patent: 6384681 (2002-05-01), Bonds
patent: 1 067 676 (2001-01-01), None
patent: 2 532 491 (1984-03-01), None
patent: WO 97/28598 (1997-08-01), None

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