Class D amplifier having PWM circuit with look-up table
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United States of America Patent
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Jun 7, 2011
Grant Date -
Aug 12, 2010
app pub date -
Apr 22, 2010
filing date -
Dec 31, 2007
priority date (Note) -
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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.
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