Interface circuit for linking microprocessors

Details Interface circuit for linking microprocessors Interface circuit for linking microprocessors

1993-06-09

1995-08-22

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327319, 327322, H03K 508

Patent

active

054444098

ABSTRACT:
An interface circuit for linking microprocessors, intended to limit the current (Iout) in the link (L1-L2) by inserting in the link the emitter-collector path of a first transistor (T.sub.1) which is in the saturated state during operation. This circuit includes a second transistor (T.sub.2) which has a geometry k times smaller than that of the first transistor (T.sub.1) and which is coupled to the first transistor (T.sub.1) so as to produce a copy (Iy) of the link current (Iout), and a base current generator (10) which produces an output current (Iz) which feeds the bases of the first and the second transistor (T.sub.1, T.sub.2), and which is a regressive function of the copy current (Iy), on the basis of a fixed reference current (I.sub.0). A pair of transistors (T.sub.3, T.sub.4), similar to the first and the second transistor (T.sub.1, T.sub.2) but connected to the link (L1-L2) in an inverted manner, provides protection for bidirectional operation. The interface circuit can be used for temporary links between different microprocessors, for example in chip cards.

REFERENCES:
patent: 4567537 (1986-01-01), Kalkhof et al.
patent: 4656565 (1990-09-01), Bahlmann
patent: 5146116 (1992-09-01), Sugimoto

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