Differential amplifier circuit requiring small amount of bias current in a non-signal mode
US6542033B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 2002 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | May 31, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45651
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential amplifier circuit of the present invention comprises an input circuit 10 for producing a difference voltage signal between a positive input signal and a negative input signal, a feedback bias circuit 20 for inputting the difference voltage signal supplied from the input circuit 10 to provide a bias voltage corresponding to the difference voltage signal and for performing a feedback control on the bias voltage by feeding back an output current, an output circuit 30 for supplying a load with the output current corresponding to the bias voltage, and a current detection circuit 40 for detecting the output current to provide it to the feedback bias circuit 20. The differential amplifier circuit performs class-AB amplification in such a way that the bias voltage provides a current value close to zero when the difference voltage signal is substantially zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.