Delta sigma pwm dac to reduce switching
US5815102A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1996 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Jun 12, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/3026
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.