Emitter coupled logic circuit having rapid output voltage

Details Emitter coupled logic circuit having rapid output voltage Emitter coupled logic circuit having rapid output voltage

1989-10-02

1990-11-13

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307270, 307475, 307496, H03K 1704

Patent

active

049704168

ABSTRACT:
An emitter coupled logic circuit comprises a first NPN transistor having a base connected to an input terminal, a second NPN transistor having an emitter connected commonly to an emitter of the first NPN transitor, a base connected to receive a first reference voltage and a collector connected to a high voltage line, and a constant current source connected between a low voltage line and the commonly connected emitters of the first and second NPN transistors. A third NPN transistor having an emitter connected to a collector of the first NPN transistor and a base connected to receive a second reference voltage. A collector of the third NPN transistor is connected through a resister to the high voltage line. A PNP transistor has a base connected to the collector of the first NPN transistor and a collector connected to the low voltage line, and a fourth NPN transistor has a base connected to the collector of the third NPN transistor and a collector connected to the high voltage line. Emitters of the PNP transistor and the fourth NPN transistor is connected to each other and also connected to an output terminal of the emitter coupled logic circuit. When the second NPN transistor is turned on and the first NPN transistor is turned off, the fourth NPN transistor is turned on and the third NPN transistor and the PNP transistor are off, with the result that a load capacitance between the high voltage line and the output terminal is discharged through the turned-on fourth NPN transistor.

REFERENCES:
patent: 4533838 (1985-08-01), Fujita
patent: 4539493 (1985-09-01), Vanadarajan
patent: 4626709 (1986-12-01), Mazumder et al.
patent: 4633104 (1986-12-01), Mallinson
patent: 4645951 (1987-02-01), Uragami
patent: 4888501 (1989-12-01), Sanwo et al.
patent: 4902915 (1990-02-01), Tran
patent: 4906871 (1990-03-01), Iida

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