Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2008-08-05
2010-02-09
Pascal, Robert (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
Reexamination Certificate
active
07659778
ABSTRACT:
A class D amplifier is provided. The class D amplifier includes an interpolator, a sampling rate converter, a pulse width modulator, a sigma-delta modulator, and a pulse width modulation (PWM) pulse generator (PPG). The sampling rate converter interpolates the output of the interpolator such that the sampling rate converter up-samples the interpolator output by a factor that is greater than one and less than two. The pulse width modulator outputs a multi-bit digital signal. The sigma-delta modulator performs sigma-delta modulation on the pulse width modulator output, the order of the sigma-delta modulation is programmable, and the output of the sigma-delta modulator is a multi-bit, digital signal. At least one of the orders to which the sigma-delta modulator can be programmed is greater than two. The PPG provides a pulse signal such that the width of each pulse is based on the value of the sigma-delta modulator output.
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Branch John W.
Darby & Darby PC
Nguyen Khiem D
Pascal Robert
Zoran Corporation
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