Common-mode feedback for differential amplifier
US10090815B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 2016 |
| Grant date | Oct 2, 2018 |
| Priority date | — |
| Expiry date | Feb 14, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45512
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An embodiment circuit includes an operational amplifier having a first output terminal and a second output terminal. The circuit further includes a detector coupled between the first output terminal and the second output terminal of the operational amplifier. The detector is configured to detect a common-mode output voltage at the first output terminal and the second output terminal of the operational amplifier. The circuit also includes a feedback amplifier having a first input terminal coupled to the detector and a second input terminal configured to receive a reference voltage. The feedback amplifier is configured to generate a feedback signal based on the common-mode output voltage and the reference voltage and to provide the feedback signal to the operational amplifier. The circuit additionally includes an impedance element having a first terminal coupled to the first input terminal of the feedback amplifier and a second terminal coupled to a supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.