Method and apparatus for calibrating a gain control circuit
US5381148A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1993 |
| Grant date | Jan 10, 1995 |
| Priority date | — |
| Expiry date | Jul 12, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/51
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system includes a digital-to-analog converter circuit and a calibration circuit. The digital-to-analog converter circuit includes a gain control circuit providing volume adjustment. The system includes a calibration mode and a normal mode of operation. During calibration, a correction value associated with the gain control circuit is measured by the calibration circuit and stored. During normal operation, the stored correction value is combined with the input before provision of the same to the DAC circuit such that, for a predetermined input of midscale code, the desired system output remains constant despite any change in the volume setting of the gain control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.