Self-tuning filter

Details Self-tuning filter Self-tuning filter

1975-04-28

1976-08-31

Rolinec, R. V.

Amplifiers

Signal feedback

Phase shift means in loop path

328167, 330109, 333 80R, H03F 136

Patent

active

039784207

ABSTRACT:
A self-tuning filter is provided through the employment of a voltage tunable filter circuit which simulates a series resistor-inductor-capacitor (RLC) circuit and which is tunable to vary or adjust its resonant frequency in response to the value of an input control voltage. The filter is made self-tuning through the provision of suitable circuitry, responsive to simulated inductance and capacitance voltages, to generate the input control voltage and hence render the voltage tunable filter circuit resonant at the frequency of an applied input signal.

REFERENCES:
patent: 3786363 (1974-01-01), Lelie
brochure F20-8/71 of Frequency Devices, Inc., pp. 1-4, Aug. 1971.
Brochure C086-10-1/71 of Analog Devices, Inc., pp. 1-4, Jan. 1971.
DeBoo, et al. "Automatically Tuned Filter Uses IC Operational Amplifiers," EDN/EEE pp. 39-41; Feb. 1972.
"Applied Ideas--" Electronic Engineering p. 27, Oct. 1972.

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