Analog switching circuit

Details Analog switching circuit Analog switching circuit

1997-07-23

1999-11-30

Wojciechowicz, Edward

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Having insulated electrode

257298, 257372, 257378, 257393, 257394, 327534, H01L 2972

Patent

active

059947446

ABSTRACT:
An analog switching circuit comprises an insulated-gate field-effect transistor (Q20) having two n-type input-side and outpu-side semiconductor regions (201, 202) and a p-type semiconductor substrate region 203, for controlling conductiveness between an input terminal (IN) and an output terminal (OUT) based on a gate potential. A surge pulse detecting circuit (1020), responsive to an electric potential (Vi) of the input terminal (IN), produces a detection signal of a surge pulse equivalent to a forward bias of a PN junction formed between the semiconductor substrate region (203) and the input-side semiconductor region (201). A substrate potential setting circuit (1010) varies an electric potential of the semiconductor substrate region (203) in response to the electric potential (Vi) of the input terminal (IN) when aby detection signal is produced. Furthermore, a gate potential control circuit (1030) varies the gate potential of the insulated-gate field-effect transistor (Q20) in the same direction as the electric potential of the semiconductor substrate region (203) when the detection signal is produced.

REFERENCES:
patent: 4511814 (1985-04-01), Matsuo et al.
patent: 5321650 (1994-06-01), Kikuchi et al.

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