Emitter coupled logic having enhanced speed characteristic for t

Details Emitter coupled logic having enhanced speed characteristic for t Emitter coupled logic having enhanced speed characteristic for t

1983-09-07

1986-10-14

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307255, 307443, 307355, 307362, H03K 19013, H03K 19086, H03K 19082, H03K 19092

Patent

active

046174788

ABSTRACT:
In accordance with the invention, the reference portion of a primitive current switch used in emitter coupled logic or current mode logic is modified by introducing a slow device as the reference element in order to enhance the speed of turn on and turn off of the input elements. In particular, the reference transistor of a conventional ECL inverter gate or conventional CML inverter gate is replaced with a slow transistor or slow diode in order to bypass the emitter dynamic resistance. The emitter time constant of the reference element Q.sub.R is thereby increased so that the voltage on the common current source node (node 3) does not change substantially when the base of the input elements change transiently. As a consequence, the collector output of the input element, such as transistor Q.sub.A is switched on or off significantly faster.

REFERENCES:
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patent: 3955099 (1976-05-01), Gaskill, Jr. et al.
patent: 4140926 (1979-02-01), Price
patent: 4357547 (1982-11-01), Espe et al.
patent: 4401901 (1983-08-01), Ochi
patent: 4516039 (1985-05-01), Matsuzaki et al.
patent: 4538075 (1985-08-01), Varadarajan

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