Reactanceless synthesized impedance bandpass amplifier

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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307271, 307521, 307529, 328167, 330302, 330306, H03F 334, H03G 920, H03H 1104

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active

045217025

ABSTRACT:
An active R bandpass filter network (10) is formed by four operational amplifier stages interconnected by discrete resistances. One pair of stages (12, 14) synthesizes an equivalent input impedance of an inductance (L.sub.eq) in parallel with a discrete resistance (R.sub.0) while the second pair of stages (16, 18) synthesizes an equivalent input impedance of a capacitance (C.sub.eq) serially coupled to another discrete resistance (R.sub.i) coupled in parallel with the first two stages. The equivalent input impedances aggregately define a tuned resonant bandpass filter in the roll-off regions of the operational amplifiers.

REFERENCES:
patent: 3955150 (1976-05-01), Soderstrand
patent: 3983334 (1976-09-01), Takahashi et al.
patent: 4032857 (1977-06-01), Lum
patent: 4147997 (1979-03-01), Greaves
patent: 4168440 (1979-09-01), Gray
patent: 4185250 (1980-01-01), Regan
patent: 4382233 (1983-05-01), Hofer
patent: 4383230 (1983-05-01), Manzolini
Senani et al., "New Canonic Active RC Realizations of Grounded and Floating Inductors", Proc. IEEE (USA), vol. 66, No. 7, Jul. 1978, pp. 803-804.
Panicker, "Simulated Inductance for Low Frequency Filter", Electronic Engineering, Nov. 1976, p. 19.

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