Gain scaling of oversampled analog-to-digital converters
US4851841A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1987 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Oct 2, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/43
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Method of operation of an A/D converter having an oversampling front end quantizer coupled to a digital decimation filter. The method includes setting an effective feedback reference voltage to a value that is a predetermined factor greater than a specified maximum analog input voltage; and increasing the gain of the digital decimation filter by an amount substantially equal to the predetermined factor. In accordance with another aspect of the invention, an A/D converter includes a delta-sigma modulator wherein the full-scale analog input voltage is set below a maximum effective feedback reference voltage by a predetermined factor; and, the impulse-response coefficients of a digital decimation filter coupled to the output of the delta-sigma modulator are selected to provide full-scale digital output when a full-scale analog input voltage is applied to the analog voltage input.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.