Digital-to-analog converter
US4539552A · kind A · utility
4Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1982 |
| Grant date | Sep 3, 1985 |
| Priority date | — |
| Expiry date | Sep 10, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/505
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A digital-to-analog signal converter (1000) provides an analog output signal by subtracting bit currents reflecting a digital input signal from a constant current source (1004, 1018-1022) at a current summer (1003), with the difference current being applied to a constant load. The subtracting of the current, rather than switching the current, avoids the modulation of an associated power source since the total current demand remains the same. In that low power operation is possible, the converter is particularly suited for use in an arrangement where only a low level of operating current is available from a power source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.