Digital-to-analog converter having single-ended input interface circuit
US4423409A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1981 |
| Grant date | Dec 27, 1983 |
| Priority date | — |
| Expiry date | Apr 3, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/74
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital-to-analog converter circuit includes an open-loop reference circuit for regulating a plurality of bit switch currents and utilizes a high-speed single-ended input interface network for level shifting digital input signals to the bit switches whereat the level shifted input signals switch against a substantially fixed threshold voltage. The single-ended input interface network includes a PNP input transistor coupled to an input terminal and coupled by a resistor to a regulated voltage. The PNP input transistor is coupled to a level shifting network including an emitter follower transistor and a zener junction biased by a current source. The threshold voltage is also developed by a level shifting network that includes a zener junction for compensating variations within the level shifting network of the single-ended input interface network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.