Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2005-05-24
2005-05-24
Nguyen, Patricia (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C330S12400D, C330S304000
Reexamination Certificate
active
06897721
ABSTRACT:
The invention relates to a composite amplifier (500) based on a main amplifier (510) and an auxiliary amplifier (520), and compensation for non-linear amplifier behavior by means of respective non-linear models (570, 575) of parasitic. In order to provide proper excitation of the non-linear models, a filter network (560) based on a linear model of the output network of the composite amplifier is provided. The linear filter network (550) basically determines ideal output node voltages, which are used as input to the respective non-linear models for generating appropriate compensation signals. The compensation signals are finally merged into the input signals of the respective sub-amplifiers (510, 520), thus effectively compensating for the effects of the non-linear parasitics.
REFERENCES:
patent: 5880633 (1999-03-01), Leizerovich et al.
patent: 5901346 (1999-05-01), Stengel et al.
patent: 6097252 (2000-08-01), Sigmon et al.
patent: 6262629 (2001-07-01), Stengel et al.
patent: 6396341 (2002-05-01), Pehlke
patent: 6731173 (2004-05-01), Thompson
patent: 6765440 (2004-07-01), Chandrasekaran
Nguyen Patricia
Nixon & Vanderhye P.C.
Telefonaktiebolaget LM Ericsson (publ)
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