Class-D amplifier system

Details Class-D amplifier system Class-D amplifier system

2007-08-28

2007-08-28

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S010000, C330S20700P

Reexamination Certificate

active

11193867

ABSTRACT:
A Class-D amplifier system may include an input stage that includes an Nthorder filter, where N>1. The input stage filters an input signal to provide a filtered output signal, an input of the input stage being configured to receive the input signal as a digital pulse-width-modulated (PWM) signal. A comparator provides a quantized output signal based on the filtered output signal. An output stage is connected between a first voltage rail and a second voltage rail. The output stage provides a switching output signal at an output that varies between the first voltage rail and the second voltage rail based on the quantized output signal. A feedback path connects the output of the output stage with the input of the input stage, such that the Nthorder filter compensates for variations in at least one of the first voltage rail and the second voltage rail.

REFERENCES:
patent: 6097249 (2000-08-01), Strickland et al.
patent: 6741123 (2004-05-01), Andersen et al.
patent: 6794930 (2004-09-01), Nurminen
patent: 6819177 (2004-11-01), Ruha et al.
patent: 6922100 (2005-07-01), Midya et al.
patent: 6998910 (2006-02-01), Hezar et al.
patent: 7058464 (2006-06-01), Mallinson
patent: 7102426 (2006-09-01), Kitamura

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