Combination of active and passive filters

Details Combination of active and passive filters Combination of active and passive filters

1990-11-02

1991-12-10

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333168, 333172, 333175, 328167, 330109, H03H 701, H03H 1104

Patent

active

050722000

ABSTRACT:
A combination of passive electrical filters and active electrical filters in a series arrangement forming active passive band pass or high pass or low pass or band reject filters. The preferred embodiment includes an amplifier stage to include high input impedance. These filter combinations are free of internal electrical noise.

REFERENCES:
patent: 3522457 (1970-08-01), Perra
patent: 3849677 (1974-11-01), Stacey
patent: 3904978 (1975-09-01), Daniels et al.
patent: 4560963 (1985-12-01), Sharpe
patent: 4594648 (1986-10-01), Gallios
patent: 4920563 (1990-04-01), Lemaire
Cottam, P. J.; Filters; Chap. 36; pp. 36/1-36/16.

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