Class-D amplifier with noise-immunity feedback

Details Class-D amplifier with noise-immunity feedback Class-D amplifier with noise-immunity feedback

2008-07-01

2008-07-01

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S20700P

Reexamination Certificate

active

11325121

ABSTRACT:
A class-D amplifier includes a switching transistor section, a filter, an analog to digital converter, and a feedback module. The switching transistor section is operably coupled to convert a serial input into a switched output signal. The filter is operably coupled to filter the switched output signal to produce an output of the class-D amplifier. The analog to digital converter is operably coupled to convert an analog input into a multi-bit digital signal based on a feedback signal, wherein the serial input corresponds to the multi-bit digital signal. The feedback module is operably coupled to the produce the feedback signal based on at least one varying property of the switching transistor section.

REFERENCES:
patent: 6696891 (2004-02-01), Noro et al.
Eric Gaalaas, et al, “Integrated Stereo ΔΣ Class D Amplifier”, IEEE Journal of Solid-State Circuits, vol. 40, No. 12, Dec. 2005; pp. 2388-2397.

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