Multiplying digital-to-analogue converter
US5369406A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1992 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Oct 26, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/745
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A multiplying digital-to-analogue converter of the kind in which digitally weighted currents proportional to a voltage applied to an analogue input are generated at respective outputs of a current mirror arrangement. These currents are switched to an output in accordance with the value of a digital signal applied to a digital input. In order for the converter to accommodate an analogue input voltage of either polarity relative to ground and generate corresponding output currents, a bias current is applied to the current mirror input from a current source. This results in digitally weighted bias currents being generated at the current mirror outputs. These bias currents are offset by corresponding bias currents generated at respective outputs of a second current mirror arrangement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.