Current mode logic switching stage

Details Current mode logic switching stage Current mode logic switching stage

1993-10-28

1995-03-14

Westin, Edward P.

Electronic digital logic circuitry

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

Bipolar transistor

327482, 327111, H03K 1920

Patent

active

053979389

ABSTRACT:
A current mode logic switching stage, especially an output stage for driving capacitive loads, includes a differential amplifier configuration and at least two bipolar transistors, which are connected as an emitter follower circuit to the output of the differential amplifier configuration. The emitter of one of the bipolar transistors is connected with an output of the switching stage. A controllable current source, which is controlled by a comparison device, is connected between the output and a negative supply potential. The comparison device receives emitter signals of the bipolar transistors. The current source is controlled in such a way that it impresses a high current only during a negative output signal edge. The comparison device is formed with a current mirror.

REFERENCES:
patent: 4678942 (1987-07-01), Kanai
patent: 4906869 (1990-03-01), Masuoka
patent: 4980582 (1990-12-01), Waller
patent: 5013941 (1991-05-01), Jansson
patent: 5177379 (1993-01-01), Matsumoto
Proceedings of the IEEE, vol. 78, Nov. 1990, (Wilson) pp. 1707-1719.

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