High band width emitter coupled logic gate

Details High band width emitter coupled logic gate High band width emitter coupled logic gate

1974-10-02

1976-08-31

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307218, 307268, 307280, H03K 1908, H03K 501

Patent

active

039783472

ABSTRACT:
A high band width logic gate including a basic current switch logic block and emitter-follower output transistors. A switchable active circuit current sink is connected between an internal voltage switching node associated with the current switch logic gate and the emitter terminal of the emitter-follower output transistor. The active current sink is switched between a relatively low conductive state to a relatively high nonsaturating conductive state in order to maintain substantially constant current flow through the emitter-follower output transistor during switching of the logic gate in order to significantly improve AC beta roll off characteristics.

REFERENCES:
patent: 3590274 (1971-06-01), Marley
patent: 3699355 (1972-10-01), Madrazo
patent: 3743856 (1973-07-01), Leuthold
patent: 3868517 (1975-02-01), Schoeff

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