Active filter having series resonant active filter terminated by

Details Active filter having series resonant active filter terminated by Active filter having series resonant active filter terminated by

1985-07-05

1987-08-11

Laroche, Eugene R.

Amplifiers

Signal feedback

Phase shift means in loop path

330303, 333213, 333217, H03F 3181

Patent

active

046864865

ABSTRACT:
A fourth (or higher) order filter has a series resonant section terminated by a parallel resonant section, both based on frequency dependent negative resistance (FDNR). The FDNR, resistance and capacitance (representing damping) of the series section are provided by a capacitive potential divider (C41,C42) connected between low impedance input (A) to the filter and an intermediate terminal forming the input of a unity-gain amplifier (A4) whose output is connected via a resistance (R4O) to the tapping point of the divider; the intermediate terminal is connected via a second resistance (R1) to the parallel section.

REFERENCES:
patent: 3886469 (1975-05-01), Rollett et al.
patent: 3895309 (1975-07-01), Rollett et al.
patent: 4147997 (1979-04-01), Greaves
patent: 4185250 (1980-01-01), Regan
patent: 4315229 (1982-02-01), Greaves et al.
Girling, F. F. J., and Good, E. F., "Active Filters 13, Applications of the Active Ladder Synthesis", Wireless World, Sep. 1970, pp. 445-450.
1979 International Symposium on Circuits and Systems Proceedings, Jul. 17-19, 1979, Tokyo, JP, IEEE, pp. 26-29, New York, US; M. Hasler: "RC-Active Filters Using FDNR-Elements and Generalized Terminations".
Electronics Letters, vol. 14, No. 7, Mar. 30, 1978, pp. 225-226, London, GB; R. E. Massara: "Design Considerations for Lowpass and Highpass All-Pole F.D.N.R. Networks".

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