Photo electric biased photo diode operational amplifier
US4118621A · kind A · utility
19Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 1977 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | May 19, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S136/291
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circuit useful in replicating the current produced in a photo diode operated as a current source at zero bias. A second scaled area photo diode is used to bias the circuit to maintain the zero bias over a wide range of illumination levels. The circuit operates in the picoampere range and is linear over at least six orders of magnitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.