Wide bandwidth photoelectric converting circuit
US4935618A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1988 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Aug 22, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S136/293
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photoelectric converting circuit including a light-receiving element which produces a current signal corresponding to the amount of light incident upon it and a current-to-voltage converting circuit which converts the current signal to a voltage signal. The circuit is characterized in that the current signal is supplied to the current-to-voltage converting circuit through an active circuit which exhibits a low input impedance. In preferred embodiments, the active circuit is a common-base transistor circuit in which an emitter current is supplied to the light-receiving element and a collector voltage is outputted as an output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.