Interface circuits between injection-logic layers which are supe

Details Interface circuits between injection-logic layers which are supe Interface circuits between injection-logic layers which are supe

1981-09-17

1984-03-27

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307459, 307475, H03K 19092, H03K 19091

Patent

active

044396953

ABSTRACT:
For transferring a logic signal between a first stage and a second stage at higher level in an integrated current injection logic circuit formed by superimposed layers which are biassed with different voltages (for example an I.sup.2 L logic circuit), the collector of a first transistor at the output of the first stage controls the base of a first auxiliary transistor, whose collector is connected to the base of a second transistor, which provides the connection to the input of the second stage. In order to rapidly drain the charge stored in the base of the second transistor, said base is connected to the base of a third transistor, whose collector is connected to its base so as to form a current mirror. The switching time of the device in accordance with the invention is thus substantially reduced. Moreover, said device has the special feature that the logic levels are situated on both sides of a reference voltage applied to the base of a second auxiliary transistor, which enables it to be used as an interface between different types of logic circuits.

REFERENCES:
patent: 4013901 (1977-03-01), Williams
patent: 4109162 (1978-08-01), Heuser et al.
patent: 4137465 (1979-01-01), Hart
patent: 4243896 (1981-01-01), Chapron
patent: 4256984 (1981-03-01), Kojima
patent: 4326135 (1982-04-01), Jarrett et al.

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