NOR.sub.i circuit/bias generator combination compatible with CSE

Details NOR.sub.i circuit/bias generator combination compatible with CSE NOR.sub.i circuit/bias generator combination compatible with CSE

1992-05-12

1993-08-31

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 3072966, H03K 301

Patent

active

052412237

ABSTRACT:
NOR logic performed by a half current switch emitter follower ("HCSEF") circuit utilizing a transistor operated in the inverse active mode as its current source and having logic levels compatible with those of current switch emitter follower ("CSEF") circuitry is combined with a novel reference bias generator that controls the logic low voltage level by controlling the voltage drop across the current source. The NOR.sub.i circuit utilizes less power than CSEF circuits, has a natural threshold equal to the threshold of CSEF circuits to which it is coupled, has a delay skew of approximately 1:1, and maintains minimum signal levels with respect to variations on V.sub.cc. The reference bias generator compensates for temperature, process variables and variations in the NOR.sub.i circuit and in the power supply.

REFERENCES:
patent: 4490630 (1984-12-01), Freeman
patent: 4575647 (1986-03-01), Ashton
patent: 4605871 (1986-08-01), Price
patent: 4677312 (1987-06-01), Freeman
patent: 4709169 (1987-11-01), Ashton et al.
patent: 4871977 (1989-10-01), Schilling et al.
patent: 5072136 (1991-12-01), Naghshineh
"Half-Current Switch Circuit", IBM Technical Disclosure Bulletin, vol. 23, No. 7A, pp. 2813-2814, Dec. 1980.
"Switchable Low Voltage Current Source", IBM Technical Disclosure Bulletin, vol. 30, No. 5, pp. 9-15, Oct. 1987.
"Improved VX Generator", IBM Technical Disclosure Bulletin, vol. 33, No. 6B, pp. 370-371, Nov. 1990.

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