Active filter having reduced capacitor area but maintaining filt

Details Active filter having reduced capacitor area but maintaining filt Active filter having reduced capacitor area but maintaining filt

1990-10-15

1993-03-09

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328167, 330107, H03K 500, H04B 110

Patent

active

051928841

ABSTRACT:
An active filter comprises a differential-type voltage-controlled current source. A first resistor is connected between the first input terminal of the voltage-controlled current source and a first signal source. A second resistor is connected between the second input terminal of the voltage-controlled current source and the second signal source (or the output terminal of the voltage-controlled current source). The incremental transfer conductance gm of the filter becomes smaller by R.sub.2 /(R.sub.1 +R.sub.2) compared to that of an active filter which does not contain the first and the second resistors of the active filter of the invention, where R.sub.1 and R.sub.2 are resistance values of the first and the second resistors, respectively.

REFERENCES:
patent: 3786363 (1974-01-01), Lelie
patent: 4521702 (1985-06-01), Kleinberg
patent: 4594648 (1986-06-01), Gallios
patent: 4734596 (1988-03-01), Campbell et al.
patent: 4779056 (1988-10-01), Moore et al.
patent: 4839542 (1989-06-01), Robinson
patent: 4841179 (1989-06-01), Hagino et al.
Electronic Design, "Use Transconductance Amplifiers to Make Programmable Active Filters", #19, pp. 98-101 Sep. 13, 1976.
IBM Technical Disclosure Bulletin, "High Performance Cosmic Filter with Digital K Selection", vol. 32, No. 12, May 1990 pp. 329-332.
Elektor, "The 13600, a new OTA", vol. 8, No. 4, pp. 4-50-4-51, Apr. (1982).
Proceedings of the 1987 Bipolar Circuits and Technology Meeting, IEEE, "Single:Chip Y/C Signal-Processing LSI for 8 mm VCR System", Yamaguchi et al., pp. 139-141, Sep. 21-22, 1987.
Cambridge University Press, "The Art of Electronics", Horowitz et al., p. 7. (1980).

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