Method and apparatus for an oversampled digital to analog convertor
US5592165A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 15, 1995 |
| Grant date | Jan 7, 1997 |
| Priority date | — |
| Expiry date | Aug 15, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/504
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for an oversampled single bit digital to analog convertor (DAC) is accomplished by using an FIR filter as the analog reconstruction filter, wherein the FIR filter includes primary current sourcing circuitry and secondary current sourcing circuitry. The primary current sourcing circuitry is used to produce a portion of the FIR coefficients having relatively large values, while the secondary current sourcing circuitry is used to fine tune the FIR coefficients having the relatively large values and to produce the other FIR coefficients. Combining the results of the primary current sourcing circuitry and the secondary current sourcing circuitry produces an analog signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.