Noise-neutralizing digital interface circuit

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

H - Electricity

04

B

340/72

H04B 15/00 (2006.01) H04L 5/14 (2006.01) H04L 25/06 (2006.01)

Patent

CA 1212736

NOISE-NEUTRALIZING DIGITAL INTERFACE CIRCUIT ABSTRACT OF THE DISCLOSURE An interface circuit for facilitating the reception of bus-transmitted digital signals in the presence of electrical noise includes transmitter means adapted to be coupled to a communication bus. The transmitter means has a controllable switch means for generating digital output signals to be transmitted to the bus and receiving means coupled to the transmitter means for receiving digital input signals which define a first wave form and are transitory between a first voltage and a second voltage. The receiving means includes first conditioning means for shaping the first wave form to a second wave form and means for providing a first output condition when said second wave form transcends through a first intermediate voltage in a first transition direction and for providing a second output condition when said second wave form transcends through a second intermediate voltage in a second transition direction. The interface circuit thereby neutralizes spurious electrical signals of a first type having a maximum amplitude less than the difference between the intermediate voltages.

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