Analog-digital converter using current controlled voltage reference
US5592167A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1994 |
| Grant date | Jan 7, 1997 |
| Priority date | — |
| Expiry date | Oct 19, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/365
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A current driven span voltage source for use in an analog to digital converter includes a zero reference resistor serially connected with a resistor ladder. A first current source selectively passes a part of a first current through the resistor ladder to establish a span (gain) voltage range, and a second current source selectively passes a part of a second current through the zero reference resistor to establish a zero reference voltage for the span voltage range. The controlled current sources increase speed, reduce power and thermal noise, and improve temperature related performance as compared with voltage driven span and reference sources using operational amplifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.