Asymmetric PWM signal generator, method thereof, and data processing apparatus including the same
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United States of America Patent
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Aug 24, 2010
Grant Date -
Nov 13, 2008
app pub date -
May 9, 2008
filing date -
May 10, 2007
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Abstract
A pulse width modulation (PWM) signal generator includes a quantizer for generating a quantized signal by quantizing an input signal, an asymmetric pulse width modulator, and an error correction unit. The asymmetric pulse width modulator generates an asymmetric PWM signal by comparing the quantized signal with a reference signal, with the asymmetric PWM signal being asymmetric with respect to a center of a period of the reference signal. The error correction unit is coupled between the quantizer and the asymmetric pulse width modulator to correct an error generated from the asymmetry of the asymmetric PWM signal. The quantizer is part of a delta sigma modulator having an operating frequency that is twice that of the reference signal.
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