Polar leapfrog filter

Details Polar leapfrog filter Polar leapfrog filter

1992-03-26

1994-03-08

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328167, 330107, 330294, H03F 364, H03F 134

Patent

active

052930866

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. An integrator is provided at each of the input and output stages, and a third integrator is provided immediately preceding the output side integrator. In the case where two or more said polar networks are incorporated, an additional integrator is provided between the polar networks. The total number of all the circuits is selected to be even and equal to the order of the filter. The adjacent ones of the circuits are connected in such a manner that leapfrog type negative feedback is effected, and only the input side integrator is constructed in the form of self negative feedback type.

REFERENCES:
patent: 3986127 (1976-10-01), Ray
patent: 5177382 (1993-01-01), Kondo et al.
patent: 5182522 (1993-01-01), Tanigawa et al.
patent: 5216375 (1993-06-01), Tanigawa et al.

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