Adaptively biased differential operational amplifier for photo diode
US4092611A · kind A · utility
13Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 6, 1977 |
| Grant date | May 30, 1978 |
| Priority date | — |
| Expiry date | May 6, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential amplifier has one input connected to a reference potential and a photo diode connected in series with a level shift to the other input. A negative feedback loop is also coupled into other input. This stabilizes the amplifier and, if the level shift is made equal to the reference potential, biases the photo diode to zero, thereby reducing leakage current. A second feedback loop is used to adaptively bias the tail current in the differential amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.