Multi-bit ADC with sigma-delta modulation
US7355539B2 · kind B2 · utility
22Cited by
35References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2006 |
| Grant date | Apr 8, 2008 |
| Priority date | — |
| Expiry date | Nov 27, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/456
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
There is provided a pulse oximeter circuit including a feedback circuit configured to receive a digital output signal of a multi-bit sigma-delta modulator and generate a pulse width modulated signal (PWM). The PWM signal is directed to a first switching circuit and a D flip-flop. The first switching circuit provides a first or second reference voltage as a feedback signal to the multi-bit sigma-delta modulator. The D flip-flop generates a sample and hold signal. The sample and hold signal controls a second switching circuit coupled to the input of the multi-bit sigma-delta modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.