Modem for telecommunication system with a reflection amplifier function
US5305469A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1991 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Nov 15, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A modem which is to be included in a badge or mobile station, in a system for the exchange of data by microwaves with a fixed station or beacon. The modem has at least one transistor that works as a detector in reception or as an amplifier for the transmission of a reflection signal, according to gate bias voltages (V.sub.gs0, V.sub.gs1) that are applied to it, and drain currents (I.sub.ds) that result therefrom. The transmission-reception switching is done by transistors that switch over loads, and hence currents, on an amplifier transistor, with amplitude or phase modulation. Such a modem may find particular application in short-distance telecommunication systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.