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US 4,286,179 AGranted
Push pull switch utilizing two current switch circuits
AssigneeInternational Business Machines Corporation
InventorsRichard R. Konian, James L. Walsh
Life of this patent
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Abstract
A high speed current switch logic circuit wherein a first and a second transistor are operated in a current switching mode and wherein a third and a fourth transistor are provided whereby the current switching operation of the first and second transistor causes current switching operation of the third and fourth transistors and push pull switching of power to a load.
Claims5
A high speed current switch logic circuit comprising:
- first and second transistors having common emitter connections connected by a circuit means to a negative voltage source and means connecting both collectors to a positive voltage source;
- said circuit means including a third transistor connected between the emitter connection of said first and second transistors and said negative voltage source, said third transistor having its base connected to a voltage reference,
- an input connected to the base of the first transistor and means referencing the base of the second transistor whereby said first and second transistors are operated in a current switching mode;
- means for connecting the emitters of fourth and fifth transistors to said negative voltage source and means connecting the collectors to said positive voltage source and to opposite sides of a load;
- and
- means connecting the emitter of the first transistor to the base of the fourth transistor and means connecting the base of the fifth transistor to said voltage reference whereby current switching operation of the first and second transistors causes current switching operation of the fourth and fifth transistors, as well as push pull switching of power through said load.
3 more elements
Dependencies are inferred from the claim text.