Signal tracking electronically tunable filter

Details Signal tracking electronically tunable filter Signal tracking electronically tunable filter

1989-10-23

1991-05-28

Gensler, Paul

Wave transmission lines and networks

Automatically controlled systems

333207, H03H 1100

Patent

active

050197924

ABSTRACT:
A tunable bandpass filter for radio frequency energy with a phase-locked loop for tracking an input signal and to control the filter to keep the center frequency of the passband coincident with the frequency of the input signal is shown. Using a Yttrium Iron Garnet (YIG) filter as a frequency determining element and as a passive dispersive reference element for a frequency discriminator, the bandpass filter uses the output signal of the discriminator to form a fine tuning signal to control the center frequency of the passband of the YIG filter.

REFERENCES:
patent: 3667052 (1972-05-01), Effenberger
patent: 3668566 (1972-06-01), Trigg
patent: 3715690 (1973-02-01), Young et al.
patent: 3936830 (1976-02-01), Overburg
patent: 4426630 (1984-01-01), Folkman

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