Noise-neutralizing digital interface circuit

Details Noise-neutralizing digital interface circuit Noise-neutralizing digital interface circuit

1983-02-25

1985-03-12

Ng, Jin F.

Pulse or digital communications

Repeaters

Testing

375 58, 375 99, 307360, 307475, H04L 514

Patent

active

045049599

ABSTRACT:
The invention facilitates the reception of bus-transmitted digital signals in the presence of electrical noise and includes a transmitter adapted to be coupled to a two wire communication bus. The transmitter has a controllable transistor for switching one wire of the bus between zero and reference voltages, thereby generating digital output signals. A receiver is coupled to the bus for receiving digital input signals which define a first wave form and are transitory between a first voltage and a second voltage. The receiver includes an R-C circuit for shaping the first wave form to a second wave form and a hysteresis switch for providing a first output condition when the second wave form transcends through a first intermediate voltage in a first transition direction. A second output condition is provided when the second wave form transcends through a second intermediate voltage in a second transition direction.

REFERENCES:
patent: 3638183 (1972-01-01), Progler et al.
patent: 4017747 (1977-04-01), Sheng
patent: 4341927 (1982-07-01), Shinoi et al.
patent: 4358689 (1982-11-01), Jarrett et al.
patent: 4443884 (1984-04-01), Swarz
patent: 4445222 (1984-04-01), Smitt

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