Oversampled A/D converter using filtered, cascaded noise shaping modulators
US4862169A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1988 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Mar 25, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/418
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oversampling A/D converter for high resolution data conversion is provided. An analog input signal is quantized into a digital equivalent value with a finite quantization error associated therewith in a first circuit portion. An analog low pass filter is inserted between the first circuit portion and a second circuit portion similar in function and circuitry to the first circuit portion. The second circuit portion functions to remove the error of the first circuit portion from an output signal by providing a signal component, which when added with the output of the first circuit portion cancels the error of the first circuit portion. The low pass filter provides attenuation of quantization error provided by the second circuit portion which results in an output signal with a significantly attenuated error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.