Circuit and method for controlling the power mode a class-D...

Details Circuit and method for controlling the power mode a class-D... Circuit and method for controlling the power mode a class-D...

2006-06-15

2008-09-23

Pascal, Robert J. (Department: 2817)

Amplifiers

Combined with automatic amplifier disabling switch means

C330S251000, C330S20700P

Reexamination Certificate

active

07427893

ABSTRACT:
A circuit and a method for controlling the power mode of a class-D amplifier are provided. The power mode control circuit comprises an amplitude detector and a duration detector. The amplitude detector provides an amplitude signal according to the absolute signal level of an input signal. The duration detector provides a shut-down signal to a switching control circuit of a class-D amplifier according to the length of the time period in which the amplitude signal is at a predetermined state, wherein the switching control circuit is turned on or turned off in response to the shut-down signal.

REFERENCES:
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patent: 5805020 (1998-09-01), Danz et al.
patent: 5898340 (1999-04-01), Chatterjee et al.
patent: 6636113 (2003-10-01), Kirn
patent: 6806766 (2004-10-01), Hasegawa
patent: 7274254 (2007-09-01), Hsieh
patent: 2002/0167354 (2002-11-01), Stanley
patent: 2007/0018719 (2007-01-01), Seven

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