Method and apparatus for digital to analog conversion
US5815104A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1997 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Mar 20, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/742
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for converting a digital signal into an analog signal with minimal self generated noise is achieved by a digital to analog converter that includes a current source, a switch circuit, and a gating circuit. The current source provides a current, which is representative of digital data, to the switch circuit. The switch circuit, based on control signals provided by the gating circuit, routes the current to an analog node and/or a reference potential node. The control signals cause the switch circuit to route the current to both nodes when a clock pulse signal is in a first state regardless of the state of the data, to route the current to the analog node when the clock pulse signal is in a second state and digital data is in a second state, and to route the current to the reference potential node when the clock pulse signal is in the second state and the digital data is in a first state. In this manner, an analog representation of the digital data is present at the analog node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.