Differential circuits with constant GM bias
US9722555B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2016 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | May 20, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45642
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention is directed to electrical circuits and techniques thereof. More specifically, embodiments of the present invention provide a differential amplifier that has a differential amplifier section, a current source, and a feedback section. The differential amplifier section comprises NMOS transistors that receives two voltage inputs and generate a differential output. The current source provides a long tail for the differential amplifier section. The feedback section generates a feedback voltage based on a reference bias voltage. The feedback voltage is used by an amplifier to control the current source and to keep the biasing and gain of the differential amplifier substantially constant. There are other embodiments as well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.