Sigma-delta analog-to-digital converter
US6232902A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1999 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Sep 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/456
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A sigma-delta analog-to-digital (A/D) converter comprising an input terminal, an adder, an integrator, a comparator and a flip flop circuit connected in series, with an output signal of the flip flop circuit being provided at an output terminal, and being fed back to the adder through a digital-to-analog (D/A) converter, so that the A/D converter provides a pulse density signal corresponding to a given input signal, wherein the comparator output is isolated from the input terminal of the flip flop circuit, and the output of the flip flop circuit is isolated from the D/A converter input terminal thereby achieving reduction of current consumption. The invention is useful in two wire vortex flowmeters, for example.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.