Differential bipolar stray-insensitive pipelined digital-to-analog converter
US6583743B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 2001 |
| Grant date | Jun 24, 2003 |
| Priority date | — |
| Expiry date | Dec 4, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/72
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pipelined digital-to-analog converter (DAC) converts a digital input to an analog output. The pipelined DAC has a plurality of stages. A first of the plurality of stages is coupled to an initialization capacitor and ground. Each of the remainder of the plurality of stages is coupled to a respective previous stage. Each of the plurality of stages includes a capacitor, a first switch and a second switch. The capacitor has first and second plates. The capacitor receives a charge at the first plate in accordance with an associated bit of the digital input. The first switch couples the first plate of the capacitor to ground when the capacitor is not receiving the charge. The second switch couples the second plate of the capacitor to ground when the capacitor is receiving the charge. Coupling the capacitor to ground reduces the effect of stray capacitance in the pipelined DAC, improving its performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.