Tetrode transistor

Tetrode transistor

A tetrode transistor is any transistor having four active terminals.

Early tetrode transistors

There were two types of tetrode transistor developed in the early 1950s as an improvement over the point-contact transistor and the later grown junction transistor and alloy junction transistor. Both offered much higher speed than earlier transistors.

*Point-contact transistor having two emitters. It became obsolete in the middle 1950s.
*Modified grown junction transistor or alloy junction transistor having two connections at opposite ends of the base [cite book
last = Wolf
first = Oswald
coauthors = R. T. Kramer; J. Spiech; H. Shleuder
title = Special Purpose Transistors: A Self-Instructional Programmed Manual
publisher = Prentice Hall
year = 1966
pages = pp. 98–102] . It achieved its high speed by reducing the input to output capacitance. It became obsolete in the early 1960s with the development of the diffusion transistor.

Modern tetrode transistors

*Dual emitter transistor, used in two input transistor-transistor logic gates.
*Dual collector transistor, used in two output integrated injection logic gates.
*Diffused planar silicon bipolar junction transistor [US patent|4143421 - "Tetrode transistor memory logic cell", March 6, 1979. Filed September 6, 1977.] , used in some integrated circuits. This transistor, apart from the three electrodes, emitter, base and collector, has a fourth electrode or grid made of conducting material placed near the emitter-base junction from which it is insulated by a silica layer.
*Field effect transistors having two gates.

References

External links

* [http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1471810 Some application aspects of the tetrode transistors] PDF (point contact)
* [http://semiconductormuseum.com/PhotoGallery/PhotoGallery_3N22.htm TRANSISTOR MUSEUM Historic Transistor Photo Gallery WESTERN ELECTRIC 3N22] (grown junction)
* [http://ieeexplore.ieee.org/iel5/16/31551/01472171.pdf?arnumber=1472171 The Tetrode Power Transistor] PDF (alloy junction)


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