Device for multiplying a capacitance by a variable coefficient t

Details Device for multiplying a capacitance by a variable coefficient t Device for multiplying a capacitance by a variable coefficient t

1995-02-08

1998-03-10

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327552, 327524, 330294, H03K 500, H03G 302

Patent

active

057265992

ABSTRACT:
A device for multiplying a capacitance by a variable coefficient, for example for adjusting a cut-off frequency of a filter, includes a current amplifier for amplifying a current flowing through said capacitance. The capacitance is floating between first and second predetermined points. The current amplifier circuit includes a differential current amplifier.

REFERENCES:
patent: 4339729 (1982-07-01), Jason et al.
patent: 5166560 (1992-11-01), Liu
patent: 5317216 (1994-05-01), Hosoya et al.
patent: 5327027 (1994-07-01), Taylor
Electronic Design, vol. 39, No. 5, Dec. 1991, Hasbrouck Heights, New Jersey, p. 113; J. Dunn, "Vary Capacitance to Positive or Negative".
International Journal of electronics, vol. 64, No. 6, Jun. 1988, London GB, pp. 941-845; Sitthichai Pookaiyaudom eet al "Efficient Circuit Implementation . . . Transconductance Amplifiers".

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