Variable reactance circuit producing negative to positive varyin

Details Variable reactance circuit producing negative to positive varyin Variable reactance circuit producing negative to positive varyin

1988-06-13

1991-02-05

Lee, Benny

Wave transmission lines and networks

Negative resistance or reactance networks of the active type

333214, 333216, 330257, H03H 1148

Patent

active

049908723

ABSTRACT:
A reactance circuit comprises a differential amplification circuit formed by differentially connecting the first and second transistors to each other, a load connected to a collector of the first transistor, a reactance element interposed between a base of the first transistor and a reference potential point, and a capacitor and a resistor connected in series between the collector and the base of the first transistor. A negative feedback loop to the first transistor is formed by the capacitor and the resistor. Accordingly, when the collector of the first transistor is used as an output terminal, a negative equivalent reactance is produced in the output terminal.

REFERENCES:
patent: 3986145 (1976-10-01), Hongu et al.
patent: 4587500 (1986-05-01), Tanaka et al.
patent: 4638265 (1987-01-01), Lunn et al.

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