PWM digital amplifier with high-order loop filter

Amplifiers – Modulator-demodulator-type amplifier

Reexamination Certificate

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C330S20700P, C330S251000

Reexamination Certificate

active

11308122

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.

REFERENCES:
patent: 5805020 (1998-09-01), Danz et al.
patent: 5815581 (1998-09-01), Andersson
patent: 6577186 (2003-06-01), Berkhout
patent: 7046080 (2006-05-01), Watts et al.

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