Frequency discriminator apparatus

Details Frequency discriminator apparatus Frequency discriminator apparatus

1978-10-16

1981-04-21

Heyman, John S.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329116, 455263, 455326, 455337, H03K 906, H04B 116

Patent

active

042635543

ABSTRACT:
A frequency discriminator having at least one ferrimagnetic resonator in a band pass or band reject configuration, the frequency of which is swept over a frequency band of interest, a detector receives the filter output, and the timing relationship between the detector output and the swept frequency is compared to generate the discriminator output. The discriminator has a bandwidth variable from a relatively narrow range to a very wide range in which the center frequency is simultaneously tunable over an extremely wide frequency range. The discriminator is insensitive to amplitude variations of the input signal and is capable of demodulating low level signals. The frequency discriminator is particularly useful for microwave frequency applications, for example, as a discriminator in a simple microwave FM receiver.

REFERENCES:
patent: 3434057 (1969-03-01), Jackman et al.
patent: 3435346 (1969-03-01), Allen et al.
patent: 3515996 (1970-06-01), Nixon et al.
patent: 3922483 (1975-11-01), Indri
Proceeding of the IEEE vol. 60, No. 12, Dec. 1972 "A Sampling FM Wide-Band Demodulator Useful For Laser Doppler Velocimeters" By Iten & Dandliker pp. 1470-1475.

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