Analog switch

Details Analog switch Analog switch

1975-02-12

1976-05-04

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307297, 307304, H03K 1766, H03K 1768

Patent

active

039551032

ABSTRACT:
An analog switching circuit employs a field effect transistor as a switching element and a regulation circuit for maintaining the bias on the FET constant with changes in the amplitude of an analog signal in the circuit being controlled. The regulation circuit includes a current source, a pair of elements for generating a voltage drop connected in parallel with one another and in series with the current source, and a circuit for maintaining the voltage drops in those circuit elements equal to one another. The circuit elements are connected in series with one another between the source and the gate of the FET, such that the bias on the FET remains constant. A control circuit is operative to disrupt the balance of currents in the circuit elements to cause the FET to become nonconductive.

REFERENCES:
patent: 3448293 (1969-06-01), Russell
patent: 3449688 (1969-06-01), Brown
patent: 3678297 (1972-07-01), Takahashi
patent: 3720848 (1973-03-01), Schmidt, Jr.
patent: 3764921 (1973-10-01), Huard
patent: 3825778 (1974-07-01), Ahmed
martin, "Bipolar-To-Mosfet Level Converter Circuit"; IBM Tech. Discl. Bull.; Vol. 11, No. 10, pp. 1272-1273; 3/1969.

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