Analogue-to-digital converters
US5668552A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1994 |
| Grant date | Sep 16, 1997 |
| Priority date | — |
| Expiry date | Dec 28, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/454
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An analog-to-digital converter includes an input for analog signals, a quantizer for producing a digital signal output, a feedback loop for feeding a signal derived from the digital output to be combined in analog form with the analog input for input to a filter. The output of the filter is fed to the quantizer. The filter comprises at least three filter stages. The filtered signal is derived using the output of at least one stage, other than the first stage, which is representative only of the response of the corresponding filter order and not of other filter orders. The output of the third stage is representative only of the third order response. A limiter is provided in the output of the third stage of the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.