JFET analog switch with gate current control

Details JFET analog switch with gate current control JFET analog switch with gate current control

1991-02-08

1991-10-01

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307450, 307455, 307571, 307573, H03K 19094, H03K 17684

Patent

active

050536532

ABSTRACT:
An analog switching circuit may be implemented with MESFETs without forward biasing the switching device, and is applicable to JFET switches in general. Switching currents are provided from the nominal input line which closely tracks the true analog input voltage, but is segregated therefrom. A current supply fed from the nominal input line provides transient charging current to the gate of the switching transistor during the switching transition from OFF to ON states. Voltage setting devices hold the gate and source of the enhancement-mode current supply at approximately the nominal supply voltage level when the switching transistor is ON, while a control section holds the gate and source of the current supply device at a negative reference voltage level when the switching transistor is OFF. In either case, the current supply device is inhibited from delivering gate current to the switching transistor during steady state operation.

REFERENCES:
patent: 4712025 (1876-12-01), Weiss
patent: 4808851 (1987-02-01), Chantepie
patent: 4831284 (1989-05-01), Anderson et al.
patent: 4883985 (1987-10-01), Katsu et al.
Precision Monolithics, Inc. 1988 Analog IC Data Book, pp. 13-8 through 13-14.
GigaBit Logic, S0030, "Dual GaAs SPST Switch", Aug. 1988.

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