Delta sigma pwm dac to reduce switching

Details Delta sigma pwm dac to reduce switching Delta sigma pwm dac to reduce switching

1996-06-12

1998-09-29

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341152, H03M 300

Patent

active

058151028

ABSTRACT:
A digital to analog (D/A) converter for hearing aids and the like includes a delta sigma modulator and a duty cycle demodulator. The delta sigma modulator converts medium rate, high resolution data into medium rate, medium resolution data, and the duty cycle demodulator converts the medium rate, medium resolution data into low resolution, high rate data. The duty cycle demodulator utilizes a lookup function to format the output data in a format having lowered transition rates, resulting in lower power use. The delta sigma converter may include a correction factor in at least one of its feedback loops to compensate for the characteristics of the output data from the duty cycle demodulator.

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