Automatic tuning circuits for voltage controlled filters, by dig

Details Automatic tuning circuits for voltage controlled filters, by dig Automatic tuning circuits for voltage controlled filters, by dig

1979-04-04

1981-03-17

Gensler, Paul L.

Wave transmission lines and networks

Automatically controlled systems

Impedance matching

328167, H03H 1702

Patent

active

042570182

ABSTRACT:
Automatic tuning circuit for voltage controlled filters, by digital phase control, including an oscillator and a path to be filtered associated with the voltage controlled filter, wherein the voltage controlled filter must be adjusted on a frequency equal or shifted by a preset amount with respect to the oscillator frequency, including means to scan the filter response while it is fed by the signal of the oscillator, means to detect the shift (positive or negative) of the filter response with respect to the oscillator frequency, means to measure in a digital way such a shift and arranged to provide a signal to correct the filter response, and means for digital storage of that correction signal.

REFERENCES:
patent: 3639852 (1972-02-01), Boyer
patent: 3667052 (1972-05-01), Effenberger
patent: 3978416 (1976-08-01), Sutphin, Jr.
patent: 3997773 (1976-12-01), Van Essen et al.

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