Balanced, floating, spread-spectrum pulse width modulator circuit
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United States of America Patent
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Jan 30, 2007
Issued Date -
N/A
app pub date -
Jun 18, 2004
filing date -
Jun 18, 2004
priority date (Note) -
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Abstract
A fully differential class D amplifier includes a pulse width modulator and a power stage. The pulse width modulator is arranged to employ a differential output signal provided from the power stage as a feedback signal. The pulse width modulator includes a transimpedance amplifier that is arranged to generate a triangle wave from the input signal and the feedback signal. The transimpedance amplifier is arranged to generate the triangle wave such that the triangle wave that has approximately a 50% duty cycle when no input signal is applied. Additionally, the input signal adjusts the frequency of the triangle wave such that the triangle wave is a spread spectrum signal. The triangle wave is compared to a threshold signal to provide a pulse width modulated signal.
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