Class D amplifier having PWM circuit with look-up table

Details Class D amplifier having PWM circuit with look-up table Class D amplifier having PWM circuit with look-up table

2011-06-07

2011-06-07

Nguyen, Patricia (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000, C330S20700P

Reexamination Certificate

active

07956681

ABSTRACT:
A class D amplifier includes a noise-shaping modulator, a pulse width modulator, and a pulse amplifier. The noise-shaping modulator receive a pulse code modulated (PCM) signal and produces an oversampled PCM signal. The pulse width modulator produce a pulse width modulated (PWM) signal from the oversampled PCM signal. The pulse amplifier amplifies the PWM signal to produce an amplified PWM signal. The PWM uses a lookup table to convert from PCM to PWM. A compensation circuit optimizes amplifier performance. An optional demodulator filter converts the amplified PWM signal to an analog signal. The amplifier is ideal for integrated audio applications.

REFERENCES:
patent: 5617058 (1997-04-01), Adrian et al.
patent: 6992610 (2006-01-01), Komarura

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