Output common mode voltage stabilizer over large common mode input range in a high speed differential amplifier
US8350622B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2009 |
| Grant date | Jan 8, 2013 |
| Priority date | — |
| Expiry date | Oct 2, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45702
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit includes a differential amplifier having a folded cascode architecture with a pair of cascode transistors. A sensing circuit senses a common mode input voltage of a differential input signal applied to the differential amplifier. A bias generator circuit generates a bias voltage for application to the pair of cascode transistors in the folded cascode architecture. The bias generator circuit is connected to an output of the sensing circuit such that the generated bias voltage has a value which is dependent on the sensed common mode input voltage. This dependence stabilizes a common mode output voltage from the differential amplifier in response to changes in the common mode input voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.