Voice frequency RC active filter

Details Voice frequency RC active filter Voice frequency RC active filter

1978-05-03

1980-01-22

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330109, 333213, 333217, H03F 3181

Patent

active

041852508

ABSTRACT:
A voice-frequency RC-active filter comprising a plurality of resistors and generalized impedance converter networks for synthesizing the frequency response of a preselected LC filter. Each generalized impedance converter network includes a pair of operational amplifiers and a plurality of impedances Z1, Z2, Z3, Z4 and Z5 interconnected with the amplifiers to provide the network with a driving point impedance ##EQU1## in which at least one of the impedances in both the numerator and the denominator of Zi includes a film-type resistor. At least one of the film-type resistors included in the impedances Z1, Z2, Z3, Z4 and Z5 is functionally trimmed to tune the filter. The capacitors in the filter are preferably discrete polycarbonate capacitors with a capacitance tolerance of .+-.5%, and all having the same value.

REFERENCES:
patent: 2983875 (1961-05-01), Zechter

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