Multi-stage operational amplifier for interstage amplification in a pipeline analog-to-digital converter
US6577185B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2001 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Oct 26, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An operational amplifier for a pipeline analog-to-digital converter (ADC). The operational amplifier includes a cascaded chain of differential amplifiers, each differential amplifier including resistive-averaged common mode feedback to produce a common mode voltage for the differential amplifier, a particular differential amplifier of the chain having the highest gain of the gains of the differential amplifiers. The operational amplifier has one or more feedback paths each including a compensation capacitor to compensate the operational amplifier. Also included are one or more switches controlled by a control signal to switch on or off the differential amplifiers of the chain other than the highest-gain differential amplifier of the chain such that the power consumption of the operational amplifier is reduced by turning off the differential amplifiers other than the highest-gain differential amplifier while the dynamic response of the operational amplifier is not compromised by the highest-gain differential amplifier being turned on or off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.