Interface device between a broad-band ultrahigh frequency optoelectronic sensor and a load
US6229398A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1999 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Sep 9, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/607
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An interface device is disposed between an optoelectronic sensor and a load the impedance of which is lower than that of the sensor. The interface device comprises an impedance adaptation stage, comprising a distributed amplifier with a broad band of frequencies, the input of which is directly connected to a terminal of the sensor, and constitutes an impedance with an ohmic value which is greater than that of the load, and the output of which is connected to the load. The device additionally comprises a bootstrap which comprises a field-effect transistor mounted in a common drain, the gate of which is connected to a terminal of the sensor, and the source of which is connected to the other terminal of the sensor, via a capacitor with a selected value. The noise factor of an optical connection which uses the said sensor is reduced, whilst maintaining a high, flat level of gain in a very broad frequency band ranging from a few kHz to a few GHz, whereas the bootstrap can compensate for the undesirable effects of the parasitic capacitor of the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.