Cross-coupled multipath feedforward operational amplifiers
US8536939B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2011 |
| Grant date | Sep 17, 2013 |
| Priority date | — |
| Expiry date | Nov 24, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45701
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An operational amplifier can include a plurality of amplifiers connected to form a plurality of amplification paths extending from an input terminal to an output terminal of the operational amplifier. An amplifier in one of the amplification paths can include an intrinsic amplification-transistor capacitance connected between a first amplifier input and a first amplifier output, and a cross-coupling capacitor connected between the first amplifier input and a second amplifier output. A plurality of the amplification paths can include series-connected amplifiers connected in parallel with the cross-coupled amplifier. The cross-coupling capacitor can have a capacitance value selected as a function of the intrinsic capacitance and a gain experienced between the amplifier inputs and outputs. The operational amplifier can include an AC coupling capacitor connected in series with the cross-coupled amplifier. The operational amplifier can be arranged in feedback configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.