Pulse or digital communications – Repeaters – Testing
Patent
1989-04-10
1991-09-17
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
178 63C, 307551, 307561, 371 571, H03G 1104
Patent
active
050501879
ABSTRACT:
An AC coupling receiver circuit for use in a communication system comprises a comparator connected to transmission lines forming a twisted pair wire, through AC coupling capacitors, and a non-linear element connected between the transmission lines at a position close to the comparator with respect to the capacitors. When positive and negative pulses are respectively applied to the transmission lines, the voltages of the transmission lines are respectively increased and decreased to bring the non-linear element to a substantially cut-off state, thus causing the comparator output to be inverted. As the positive and negative pulses decay, the comparator output is again inverted, thus effectng signal transmission. During the application of pulses, the charge stored in the capacitors is quickly discharged through the non-linear element, whereby fluctuation of the received threshold voltage resulting from the stored charge can be eliminated even if pulse inputs are continuous. A high-reliability communication system can be realized by incorporating circuits which enable signal transmission even in the event of a short circuit or disconnection of the transmission lines.
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IBM Technical Disclosure Bulletin, vol. 26, No. 8, Jan. 1984, p. 3995-"Anti-Saturating ANR Cable Receiver".
Safourek Benedict V.
The Furukawa Electric Co. Ltd.
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