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US 7,388,425 B2Granted
PWM digital amplifier with high-order loop filter
AssigneeASP Technologies
InventorWai L. Lee
Life of this patent
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Abstract
An improved PWM amplifier is disclosed that uses multiple integrators in the loop filter to provide high loop gain across the frequency band-of-interest. The frequency characteristics of the loop filter are optimized to distribute large loop gains across the entire band to provide large suppression of noise and distortions generated in the modulation and output stages.
Claims20
A pulse width modulated digital amplifier for amplifying an incoming digital signal Ei and generating an output digital signal Eo,
- the digital amplifier including a digital signal amplification section for digitally amplifying a digital signal and a feedback loop for carrying a portion of the output digital signal Eo,
- the digital signal amplification section including a limiter to control overload.
Dependencies are inferred from the claim text.