Analog switch comprising connected bipolar junction transistors

Details Analog switch comprising connected bipolar junction transistors Analog switch comprising connected bipolar junction transistors

1998-09-04

2000-10-31

Zweizig, Jeffrey

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327482, H03K 1760

Patent

active

06140859&

ABSTRACT:
An analog switch is constructed using two bipolar junction transistors. The emitter of the first transistor is coupled to the emitter of the second transistor, and preferably the base of the first transistor is coupled to the base of the second transistor. The collectors of the transistors form the terminals of the analog switch. A current source is coupled to the bases of both transistors. The current source produces a drive current sufficient to forward bias the base-emitter junctions of both transistors. In this forward biased state, the collector of the first transistor and the collector of the second transistor are electrically coupled. A bias voltage source is coupled via a switch to the bases of both transistors. The bias voltage source produces a voltage sufficient to reverse bias the base-collector junctions of both transistors. In this reverse biased state, the electrical connection between the collector of the first transistor and the collector of the second transistor is broken.

REFERENCES:
patent: 3024369 (1962-03-01), Royer
patent: 3254240 (1966-05-01), Lambourn
patent: 3346698 (1967-10-01), Bradford
patent: 3378700 (1968-04-01), Stewart
patent: 3453451 (1969-07-01), Orrell, Jr.
patent: 3515905 (1970-06-01), Raper
patent: 5617055 (1997-04-01), Confalonieri et al.
Rohm Co. Ltd., Discrete Components Databook, 1990 edition, p. 582.
Schematic of the NI-5102, a product that was released by National Instruments Apr. 1, 1997, 1 page.
Paul Horowitz and Winfield Hill, "The Art of Electronics," 2.sup.nd edition,(Cambridge University Press, 1989), pp. 142-143.

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