Bidirectional interface circuit having a unipolar port and a bip

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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307443, 307473, 307243, H03K 19092, H03K 1716, H03K 1756

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active

047975822

ABSTRACT:
The invention relates to the transmission of logic signals.
The circuit comprises a port D connected to a line for the transmission of unipolar logic signals and a port (D+, D-) connected to a pair of wires for the transmission of differential logic signals. Current generators (T4, T5) send a positive differential signal when a unipolar "low" logic signal is applied to port D. When the differential signal received at (D+, D-) must be transmitted on the D port by a "low" level, the signal representing the low level remains higher than the voltage level V.sub.L1 below which the voltage generators are activated, in order to prevent any blockage of the circuit by looping of the signals within the circuit.
Application to the multiplexing of the flow of data processed in an automobile vehicle.

REFERENCES:
patent: 4608504 (1986-08-01), Yanamoto
patent: 4695740 (1987-09-01), Carter
IEEE Transactions on Consumer Electronics, vol. CE14 27, No. 1, Feb. 1981, pp. 102-116, IEEE, New York.
Electronic Engineering, vol. 56, No. 689, May 1984, pp. 97-99, London, GB.

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