Leapfrog filter having adjustable center frequency and quality f

Details Leapfrog filter having adjustable center frequency and quality f Leapfrog filter having adjustable center frequency and quality f

1990-05-23

1991-07-02

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

307520, 330306, 330107, H03F 134

Patent

active

050288849

ABSTRACT:
A leapfrog filter comprising a first and a second integrator each consisting of an operational amplifier and integrating capacitor. The leapfrog filter includes differential amplifier which is arranged to differentially supply current to the first and second integrators through a first and a second current source circuit respectively; and a third current source circuit for adjusting the sum of currents supplied to the first and second current source circuits, wherein characteristics such as the center frequency f.sub.o and quality factor Q of the leapfrog filter are controlled by adjusting the respective current values.

REFERENCES:
patent: 3924199 (1975-12-01), Pearlman

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