Variable impedance circuit

Details Variable impedance circuit Variable impedance circuit

1989-10-25

1991-04-30

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

333214, H03F 345, H03H 1100

Patent

active

050122010

ABSTRACT:
A variable impedance circuit includes a first differential amplifier circuit having an input terminal pair, an output terminal pair and a capacitive element connected between the emitters of a transistor pair. The variable impedance circuit further inclludes a second differential amplifier circuit having an input terminal pair and an output terminal pair. The output terminal pair of the first differential amplifier circuit is connected to the input terminal pair of the second differential amplifier circuit. Furthermore, the output terminal pair of the second differential amplifier circuit is connected to the input terminal pair of the first differential amplifier circuit.

REFERENCES:
"Integrated Gyrator Replaces Filter Inductances," Telecommunication-Journal, vol. 43, No. 4, p. 323, Apr. 1976.
Voorman et al, "Integration of Analog Filters in a Bipolar Process," IEEE Journal of Solid-State Circuits, vol. SC-17, No. 4, Aug. 1982, pp. 713-721.
Pookaiyaudom et al, "An Accurate Integrable Voltage-Variable Floating Gyrator," IEEE Transactions on Instrumentation and Measurement, vol. IM-29, No. 1, Mar. 1980, pp. 15-19.
Pookalyaudom et al, "Integrable Electronically Variable General-Resistance Converter-A Versatile Active Circuit Element," IEEE Transactions on Circuits and Systems, vol. CAS-25, No. 6, Jun. 1978, pp. 344-353.

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