Circuit and method for generating a PWM control signal for a...

Details Circuit and method for generating a PWM control signal for a... Circuit and method for generating a PWM control signal for a...

2008-10-14

2010-06-22

Mottola, Steven J (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

Reexamination Certificate

active

07741902

ABSTRACT:
In a class-D amplifier, the input signal is compared with a carrier signal to generate a basic PWM signal, the PWM signal is then sent to a pulse processing unit, and by comparing with a basic periodic signal, half-width of the output PWM signal is extracted. Then, in the pulse processing unit, the half-width PWM pulse signal is used to generate a complete pulse whose width equals to the output PWM signal. The output power of the class-D amplifier can be kept as large as that by using differential input signals although the input signal is single-end and the entire signal processing path is kept single-ended.

REFERENCES:
patent: 6763114 (2004-07-01), Nalbant
patent: 7183840 (2007-02-01), Maejima
patent: 7385444 (2008-06-01), Kurokawa
patent: 2008/0284508 (2008-11-01), Walker et al.

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