Low distortion power amplifier and method of controlling a...

Details Low distortion power amplifier and method of controlling a... Low distortion power amplifier and method of controlling a...

2006-09-26

2006-09-26

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

C330S146000

Reexamination Certificate

active

07113032

ABSTRACT:
A multi-channel power amplifier for driving a plurality of loads, each associated to a respective channel, each channel comprising a pair of operational amplifiers, first and second, one operational amplifier of each channel being connectable through switches either in a bridge configuration with the other operational amplifier or in single-ended configuration to a constant reference voltage for driving the load of the respective channel, the amplifier comprises circuit means for comparing the signal level of the channels with at least a threshold and outputting a logic control signal for the switches. A relative method of controlling a power amplifier that allows a sensible reduction of distortion at the price of a negligible increase of dissipated power is disclosed.

REFERENCES:
patent: 4554512 (1985-11-01), Aiello
patent: 6229388 (2001-05-01), Nalbant
patent: 6346854 (2002-02-01), Heithoff
patent: 6781455 (2004-08-01), Kim
patent: 2002/0102003 (2002-08-01), Ford
patent: 2002/0186573 (2002-12-01), Quintanar et al.
patent: 0487133 (1992-05-01), None
European Search Report, ER03425380, Dec. 5, 2003.

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