High-frequency variable impedance circuit having improved linear

Details High-frequency variable impedance circuit having improved linear High-frequency variable impedance circuit having improved linear

1993-04-30

1995-10-24

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Combined impedance and switch systems

327379, 327419, 333 33, H03K 1756

Patent

active

054612659

ABSTRACT:
A variable impedance element suitable for controlling a high-frequency signal is formed of a pair of FETs of identical conduction type, and functions to prevent variations in degree of channel opening of the FETs in response to positive and negative-going changes of the controlled signal voltage, to thereby achieve high linearity of impedance characteristics. Each FET has the drain and gate electrodes mutually coupled by a capacitor, the source electrodes of the FETs are mutually coupled, the gate electrodes are mutually isolated with respect to the high-frequency signal and coupled in common to receive an impedance control voltage, and the variable impedance appears between the drain electrodes.

REFERENCES:
patent: 3763382 (1973-10-01), Horichi et al.
patent: 4647789 (1987-03-01), Upadhyayula
patent: 4706030 (1987-11-01), Willard et al.
patent: 4970620 (1990-11-01), Lehnhoff et al.
patent: 5038060 (1991-08-01), Francheteau et al.
patent: 5039891 (1991-08-01), Wen et al.

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