Polar leapfrog filter

Details Polar leapfrog filter Polar leapfrog filter

1992-04-03

1993-01-26

Sikes, William L.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330107, 330109, 330294, 307520, H03F 304

Patent

active

051825228

ABSTRACT:
A polar leapfrog filter includes at least one polar network. The polar network comprises a differentiator constituted by an operational amplifier having input and output terminals, and a first integrator formed by a first capacitor for providing negative feedback to the operational amplifier and a first variable transconductance amplifier; and a second integrator formed by a second capacitor for providing negative feedback to the first integrator, and a second variable transconductance amplifier. A differentiator is provided at each of the input and output stages of the filter. In the case where two or more said polar networks are incorporated, an additional differentiator is provided between the polar networks. The total number of all the circuit units constituting the filter is selected to provide odd order and equal order for the filter. The circuit units are connected in such a manner that leapfrog type negative feedback is effected.

REFERENCES:
patent: 4509019 (1985-04-01), Banu et al.
patent: 4560957 (1985-12-01), Cabot
patent: 5001441 (1991-05-01), Gen-Kuong
patent: 5028884 (1991-07-01), Kondo et al.

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