Electronic impedance circuit including a compensation arrangemen

Details Electronic impedance circuit including a compensation arrangemen Electronic impedance circuit including a compensation arrangemen

1982-08-27

1985-05-28

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307264, 307493, 307494, H03K 3023, H03H 1100

Patent

active

045202826

ABSTRACT:
An electronic impedance circuit is constructed of a voltage-current converter and a variable gain current amplifier. The voltage-current converter includes first and second transistors of the PNP-type differentially connected. The variable gain current amplifier includes third and fourth transistors of the NPN-type differentially connected, and fifth and sixth transistors of the PNP-type as load means. The bases of the third and fourth transistors are respectively driven by collector signals of the first and second transistors, and a collector signal of the third transistor is fed back to the base of the second transistor. In order to reduce a d.c. offset attributed to a current flowing between the base of the second transistor and the collector of the third transistor, a compensation circuit is connected to the variable gain amplifier. This compensation circuit can provide compensation by producing a compensation current for cancelling the current between the base of the second transistor and the collector of the third transistor.

REFERENCES:
patent: 4039981 (1977-08-01), Ohashi et al.
patent: 4066914 (1978-01-01), Gundry
patent: 4220875 (1980-09-01), Lawton
patent: 4288707 (1981-09-01), Katakura

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