Subranging A/D converter with converging digitally controlled voltages
US4749984A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1987 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Jun 29, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/361
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A subranging A/D converter generates high and low voltages using first and second DACs. A voltage divider receives the high and low voltages to generate plural reference voltages. A bank of comparators compares the analog voltage which is to be converted to each of the reference voltages, and a clocked logic circuit generates an intermediate digital signal indicative of the analog value relative to the plural reference voltages. The intermediate signal is used to decrement the high voltage and increment the low voltage, so that the reference voltages produced by the voltage divider assume subrange values. The process is repeated for as many clock cycles as is required to converge the high and low voltages to equal the analog voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.