D-class signal amplification circuit

Details D-class signal amplification circuit D-class signal amplification circuit

2005-09-06

2005-09-06

Nguyen, Patricia (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000, C330S051000

Reexamination Certificate

active

06940344

ABSTRACT:
A D-class signal amplification circuit of the invention intends to repress the influence by a fluctuations of the power supply voltage with a simplified circuit construction and inexpensive components. The D-class signal amplification circuit includes: a multiplier that multiplies an input signal by a correction coefficient, a first modulator that executes a delta-sigma modulation to an output signal from the multiplier, a D-class amplifier supplied with a power supply voltage VDD, which amplifies an output signal from the first modulator, a voltage conversion circuit that generates a power supply voltage VDD/2 from the power supply voltage VDD, a first low pass filter that inputs a signal converted into a level of VDD/2 on the basis of the output signal outputted from the D-class amplifier, a reference signal generation circuit supplied with VDD/2, which generates a reference signal on the basis of the input signal, a second low pass filter that inputs the reference signal, a first comparator that compares levels of the signals outputted from the first with the second low pass filters, and a coefficient control circuit that increases or decreases the correction coefficient by a predetermined modifying breadth, on the basis of the comparison result.

REFERENCES:
patent: 6191653 (2001-02-01), Camp et al.
patent: 6218897 (2001-04-01), Barzegar et al.
patent: 6590940 (2003-07-01), Camp et al.
patent: 6693571 (2004-02-01), Melanson et al.
patent: 6774725 (2004-08-01), Miki et al.
patent: 2002-536903 (2002-10-01), None

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