Recirculating analog to digital converter with auto-calibrating feature
US4799041A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1986 |
| Grant date | Jan 17, 1989 |
| Priority date | — |
| Expiry date | Oct 6, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/1023
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A recirculating type analog to digital converter is disclosed which has an auto-zero mode that is introduced prior to each conversion cycle. The loop is based on an arrangement of operational amplifiers and FET switches, and further includes a comparator circuit, a reference voltage source and a microprocessor which are coupled to the loop. Also coupled to appropriate points in the loop are three time gated integrator circuits which generate analog signals which respectively compensate for offset voltages of operational amplifiers in the loop, the offset voltage of the comparator circuit which is coupled to this loop, and the gain of the loop. The compensating signals which are generated in the auto-zero mode are applied to the loop during the conversion cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.