Electronically tunable microwave frequency FET discriminator
US4110700A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1977 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Oct 25, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D9/04
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A microwave frequency discriminator comprising a field effect transistor (FET) amplifier including an electronically variable capacitor (varactor), a biasing circuit and a detector. The FET is biased to generate an output RF signal within a predetermined frequency bandwidth in response to an input RF signal of substantially constant power level. The variable capacitor is biased to electronically provide a predetermined impedance to the transistor to augment the frequency roll-off characteristic of the FET. The biasing circuit is used to electronically match the impedance of the FET output to the input of the detector. At such impedance conditions the dc output voltage of the detector varies substantially linearly throughout the frequency bandwidth as a function of the frequency of the input RF signal, approximating the characteristic of a frequency discriminator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.