Active filter circuit

Details Active filter circuit Active filter circuit

1991-11-26

1993-01-05

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328167, 330294, 330107, H03B 100, H03K 500

Patent

active

051773821

ABSTRACT:
An active filter circuit comprises a differentiator constituted by an operational amplifier having an input terminal and output terminal, and a first integrator constituted by a first capacitor and a first variable conductance amplifier for providing negative feedback to the operational amplifier and a first variable conductance amplifier; and a second integrator constituted by a second capacitor and a second variable conductance amplifier for providing negative feedback to the first integrator. The active filter circuit is arranged such that a damping pole is set up at a predetermined frequency by adjusting operating currents of the first and second variable conductance amplifiers.

REFERENCES:
patent: 4168440 (1979-09-01), Gray
patent: 4839542 (1989-06-01), Robinson
patent: 5001441 (1991-03-01), Gen-Kuong

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