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US 7,345,533 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.
Claims22
A PWM digital amplifier for amplifying a digital signal, the digital amplifier comprising:
- a pulse width modulator section, the pulse width modulator section having an input portion for receiving an input digital signal, an integration section including two or more cascaded integrators for receiving the input digital signal and an output for outputting a pulse width modulated and amplified signal;
- the pulse width modulated and amplified signal having a magnitude value no less than 60 dB over a range of frequencies.
Dependencies are inferred from the claim text.