Close-loop Class-D audio amplifier and control method thereof

Details Close-loop Class-D audio amplifier and control method thereof Close-loop Class-D audio amplifier and control method thereof

2011-08-23

2011-08-23

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S20700P, C330S291000

Reexamination Certificate

active

08004360

ABSTRACT:
The present invention discloses a Class-D power amplifier and control method thereof. In one embodiment, the amplifier feeds back the signal at the output node to the inverting input of the comparator, and provides a high frequency triangular wave signal to the non-inverting input of the comparator. In addition, the non-inverting input of the comparator may be coupled to an offset voltage, while the inverting input of the comparator may be coupled to a fixed-frequency rectangular wave signal, a feedback signal which is derived from the output stage and an input signal. In use, the switching frequency may be at least substantially fixed, so as to reduce the influence on the system caused by electromagnetic interruption (EMI). Further, the control circuit is simple, and some devices can be integrated.

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Notice of Allowance and Fee(s) Due from U.S. Appl. No. 12/169,539 dated Feb. 9, 2010.
U.S. Appl. No. 12/968,216, filed Dec. 14, 2010.

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