Delta-sigma modulation apparatus and signal amplification apparatus
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United States of America Patent
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Sep 21, 2004
Grant Date -
Mar 11, 2004
app pub date -
May 12, 2003
filing date -
Sep 28, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A signal amplifier apparatus adapted for carrying out delta-sigma modulation of an input signal to carry out pulse width modulation (PWM) of that signal, to obtain a PWM signal, and to amplify this PWM signal so that a signal of a predetermined magnitude is obtained, wherein the signal amplifier apparatus includes a correction circuit for correcting an output of a quantizer provided in a delta-sigma modulation device. The correction circuit is installed in a feedback path with respect to the input side from the quantizer or immediately before a pulse width modulator to thereby correct distortion taking place in the amplifier. In addition, the signal amplifier apparatus invention compares PWM signals at the input and the output of the amplifier to correct the output of the quantizer that is provided in the delta-sigma modulation device, so as to cancel distortion taking place in the amplifier in accordance with respective rising time difference and falling time difference to thereby correct distortion.
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