Light signal receiver with preamplification function and dual polarization means
US5304793A · kind A · utility
7Cited by
3References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1992 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Nov 30, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/6911
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A light signal receiver in which an input of a preamplifier receives a so-called useful electric current output by a light-sensitive device. The preamplifier comprises an input stage having an input transistor assembled with a "common base" whose emitter is connected to the input of the preamplifier and whose base is kept at a fixed potential. A low input impedance and therefore a reduction of the influence of stray capacitance exhibited by the light-sensitive device results from this arrangement Further, a second input transistor can be utilized so that the preamplifier operates as a differential type preamplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.