Logic circuit

Details Logic circuit Logic circuit

1997-03-17

1999-07-20

Santamauro, Jon

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Bipolar transistor

326 18, H03K 19086

Patent

active

059260408

ABSTRACT:
An Emitter Coupled Logic (ECL) circuit includes therein a constant potential generating circuit which is comprised of a load resistor, an active pull-down transistor and a constant current source. By containing the constant potential generating circuit which has been independently provided externally to an ECL circuit, the ECL logic circuit is operable at the power supply potential of -4.5 V or -5.2 V at the high speed with reduced power supply consumption. The constant current source is an NPN transistor whose base is connected to an output node of a bias circuit, and the output of the bias circuit is an output having a value set so that a collector current of the active pull-down transistor is kept constant at all times. Hence, the electric power consumption can be further reduced.

REFERENCES:
patent: 5381057 (1995-01-01), Kuroda et al.
patent: 5473272 (1995-12-01), Wilhelm et al.
patent: 5539350 (1996-07-01), Wilhelm
patent: 5781035 (1998-07-01), Tashibu
Sedra et al. Microelectronic Circuits pp. 578-581, 1987.

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