Time constant automatic adjustment circuit for a filter circuit

Details Time constant automatic adjustment circuit for a filter circuit Time constant automatic adjustment circuit for a filter circuit

1988-08-26

1989-07-25

Mottola, Steven

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307494, 330 51, H03K 500, H03B 100, H03B 110

Patent

active

048517194

ABSTRACT:
An automatic adjustment circuit for adjusting the time constant of a filter circuit, which receives a reference signal having a predetermined voltage and a clock signal. The adjustment circuit includes an integration circuit for generating an integrated signal having a variable voltage level with periodic peak values, which includes a controllable current generating circuit, a capacitor coupled for charging a current from the controllable current generating circuit and a switch for alternately charging and discharging the capacitor in response to the clock signal, a comparator for comparing the peak value with the reference voltage and generating a control signal for adjusting the time constant of the filter circuit and a feedback circuit coupled between the comparator and the controllable current generating circuit for automatically controlling the control signal.

REFERENCES:
patent: 4691171 (1987-09-01), Van Roemund et al.
Moulding et al., "Gyrator Video Filter IC With Automatic Tuning," IEEE Journal of Solid State Circuits, vol. SC-15, No. 6, pp. 963-967, Dec. 1980.
Japanese Patent Disclosure (Kokai) No. 60-214617 Okada, Oct. 26, 1985.
Japanese Patent Disclosure No. 58-16143, Fukushima et al., Sep. 26, 1983.

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