Pulse width modulation circuit and voltage-feedback class-D amplifier circuit
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United States of America Patent
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Sep 1, 2015
Grant Date -
Feb 26, 2015
app pub date -
Oct 1, 2014
filing date -
Jun 22, 2009
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Abstract
The frequency characteristic of a voltage-feedback class-D amplifier circuit for driving an output load is improved. A triangular-wave correction circuit which compensates a gradient of a triangular wave is provided to a triangular-wave signal generator which supplies a triangular wave signal used as a PWM carrier to a comparison circuit for performing PWM modulation of an input signal. In an area where a duty of a command value for an output circuit drive becomes about 50%, a slew rate (gradient) of the triangular wave is decreased.
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