Leapfrog filter
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 11, 1992
Grant Date -
N/A
app pub date -
Jul 9, 1990
filing date -
Jul 13, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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