Delta-sigma modulator
US4920544A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1989 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Feb 10, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/418
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The delta-sigma modulator includes a secondary delta-sigma modulator which carries out a secondary delta-sigma modulation for an analog input signal, thereby producing a first quantization signal. A quantization noise extractor extracts a quantization noise occurring in the secondary delta-sigma modulator. A primary delta-sigma modulator carries out a first delta-sigma modulator for the quantization noise, thereby producing a second quantization signal. A differentiating circuit differentiates the second quantization signal supplied from the primary delta-sigma modulator. An adder adds the first quantization signal and an output signal of the differentiating circuit, thereby producing a digital output signal corresponding to the analog input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.