Switch with an MIS-FET operated as a source follower

Details Switch with an MIS-FET operated as a source follower Switch with an MIS-FET operated as a source follower

1981-05-11

1984-02-07

Anagnos, Larry N.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307575, 307584, 307578, 307264, 307270, 307482, H03K 1712, H03K 1756, H03K 17687

Patent

active

044305869

ABSTRACT:
A switch includes an MIS-FET having a source and a control electrode defining a gate-source capacitance and being operated as a source follower for switching a given voltage, a first capacitor, a first auxiliary transistor and a second auxiliary transistor cutting off the first transistor when switched into a conducting state. The transistors each have a base, a collector and an emitter electrode defining a switching path. The collectors of each of the transistors are connected to the control electrode of the FET. A control input terminal is provided as well as second and third capacitors each being connected between the control input terminal and the base of a respective one of the transistors. The emitter electrode of the second transistor is connected to the source electrode of the FET. The first capacitor has one lead connected to the emitter electrode of the second transistor and to the source electrode of the FET for charging the gate-source capacitance of the FET through the switching path of the first transistor, and another lead connected to the emitter electrode of the first transistor and to a terminal of a voltage source having a lower voltage than the given voltage to be switched by the FET for charging the first capacitor when the first transistor is cut off.

REFERENCES:
Jenkins, "Interface Circuits Drive High Level Switches from Low-Level Inputs", Electronic Engineering, pp. 45-49, May, 1971.
Hebenstreit, "Driving the SIPMOS Field Effect Transistor as a fast Power Switch", Siemens Forsch.-u. Entwickl-Ber, pp. 200-204, 5/80.
Siliconix, "VMOS Power FETs Design Catalog", pp. 4-6, Jan. 1979.

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