Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1977-10-25
1978-08-29
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
307233R, 325349, 328140, 329119, 329134, 329192, 329205R, H03D 326
Patent
active
041107004
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.
REFERENCES:
patent: 3163826 (1964-12-01), Kemper
patent: 3676785 (1972-07-01), Pichal
patent: 3975699 (1976-08-01), Van Anda et al.
Mykietyn Edward
Rosen Arye
Christoffersen H.
Grimm Siegfried H.
Lazar Joseph D.
RCA Corporation
Rodrick Robert M.
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