Differential amplifier circuit
US8432223B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 2011 |
| Grant date | Apr 30, 2013 |
| Priority date | — |
| Expiry date | Jul 26, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45674
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential amplifier circuit can reduce consumption current and the circuit size while improving a power supply rejection ratio. The differential amplifier circuit includes a power supply line and an input part that includes an input circuit and an active load. The input circuit includes two differential input elements, and the active load includes two transistors connected to the two differential input elements. The input part generates a differential signal in response to an input signal given to the two differential input elements. The differential amplifier circuit also includes an amplifying part for generating an output voltage generating signal by amplifying the differential signal. The differential amplifier circuit also includes an output part for generating an output voltage based on the output voltage generating signal and a power supply voltage. The differential amplifier circuit includes a noise permitting part located between control terminals of the two transistors and the power supply line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.