Leapfrog filter

Details Leapfrog filter Leapfrog filter

1990-07-09

1992-08-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330107, 330305, 330306, H03F 134

Patent

active

051382792

ABSTRACT:
A leapfrog filter comprises a first integrator made up of a first operational amplifier and a first capacitor connected to output terminal of the first operational amplifier; a second integrator made up of a second operational amplifier and a second capacitor connected to inverting input terminal and output terminal of the second operational amplifier; and a variable current source circuit. The first operational amplifier has the output terminal thereof connected to non-inverting input terminal of the second operational amplifier. The second operational amplifier has the output terminal thereof connected to inverting input terminal of the first operational amplifier. An input terminal is connected to non-inverting input terminal of the first operational amplifier; and output terminal connected to the output terminal of the second operational amplifier. The variable current source circuit is arranged such that bias currents supplied to the first and second operational amplifiers are controlled so as to change mutual conductances of the first and first operational amplifiers, thereby adjusting pass band width of the filter while at the same time restraining occurrence of in-band ripple.

REFERENCES:
patent: 3792367 (1974-02-01), Fleischer et al.

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