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US 4,730,124 AGranted
High transconductance composite PNP transistor
AssigneeTektronix, Inc.
InventorArthur J. Metz
Life of this patent
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Abstract
A high-transconductance composite PNP transistor comprises a PNP transistor and three or more NPN transistors arranged in a three-terminal configuration which behaves as a PNP transistor, and yet exhibits high beta, alpha greater than one, and transconductance approaching infinity.
Claims4
A composite PNP transistor, comprising:
- a collector terminal, a base terminal, and an emitter terminal;
- a first transistor of PNP conductivity type having an emitter coupled to said emitter terminal;
- a second transistor of NPN conductivity type having a collector coupled to said emitter terminal, a base coupled to said base terminal, and an emitter coupled to a base of said first transistor;
- and
- third and fourth transistors of NPN conductivity type, each having a collector, a base, and an emitter, wherein the emitters of said third and fourth transistors are coupled together to said collector terminal, the bases of said third and fourth transistors are coupled together to the collector of said third transistor, and the collectors of said third and fourth transistors are coupled respectively to a collector of said second transistor and said emitter of said first transistor.
2 more elements
Dependencies are inferred from the claim text.