Pulse-width modulation amplifier and suppression of clipping...

Details Pulse-width modulation amplifier and suppression of clipping... Pulse-width modulation amplifier and suppression of clipping...

2008-01-01

2008-01-01

Lee, Benny (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000

Reexamination Certificate

active

07315202

ABSTRACT:
A pulse-width modulation (PWM) amplifier is adapted to a class-D amplifier in which an analog input signal is subjected to integration, pulse-width modulation, and switched amplification, wherein a glitch elimination circuit eliminates noise from a pulse-width modulated signal, from which a high pulse signal and a low pulse signal are isolated such that each pulse is delayed by a dead time at the leading-edge timing thereof. When both of them are simultaneously set to a high level, one of them is reduced in level. In response to the occurrence of clipping, an integration constant applied to an operational amplifier is automatically changed from a primary integration constant to a secondary integration constant. When the clipped state is sustained for a prescribed time, an inversion pulse is compulsorily introduced into the pulse-width modulated signal.

REFERENCES:
patent: 7142050 (2006-11-01), Risbo
patent: 4-38566 (1992-09-01), None
patent: 3130919 (2000-11-01), None

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