Class D amplifier

Details Class D amplifier Class D amplifier

2006-03-15

2008-10-14

Mottola, Steven J (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

Reexamination Certificate

active

07436254

ABSTRACT:
A D class amplifier of the invention generates a carrier signal Pct based on a master clock Φp without jitter, which is supplied to a PWM circuit. Using a digital PLL including a phase comparator, a loop filter and a carrier oscillator, the generated carrier signal Pct is synchronized with a sampling signal SL. This can produce the carrier signal Pct that is not affected by the jitter contained in the sampling signal SL. Because a phase difference between the sampling signal SL and the carrier signal Pct is fedback to through a feedback circuit, jitter, which can be produced by a slight difference between the sampling signal SL and the master clock Φp can be eliminated.

REFERENCES:
patent: 6791405 (2004-09-01), Tsuji et al.
patent: 59-183510 (1984-10-01), None
patent: H03-36099 (1991-07-01), None
patent: 2000-196374 (2000-07-01), None

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