Tetrode transistor
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A tetrode transistor is any transistor having four active terminals.
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[edit] 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[1]. 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.
[edit] 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[2], 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.
[edit] References
- ^ Wolf, Oswald; R. T. Kramer; J. Spiech; H. Shleuder (1966). Special Purpose Transistors: A Self-Instructional Programmed Manual. Prentice Hall. pp. pp. 98–102.
- ^ U.S. Patent 4,143,421 - Tetrode transistor memory logic cell, March 6, 1979. Filed September 6, 1977.
[edit] External links
- Some application aspects of the tetrode transistors PDF (point contact)
- TRANSISTOR MUSEUM Historic Transistor Photo Gallery WESTERN ELECTRIC 3N22 (grown junction)
- The Tetrode Power Transistor PDF (alloy junction)
