Data regenerative system for NRZ mode signals

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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307268, 307269, 328 63, 328 74, H03K 501, H03K 508

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active

044172133

ABSTRACT:
A data regenerative system adapted to receive data signals transmitted with the Non-Return-to-Zero mode comprises a comparator for comparing the voltage level of the received data with a variable threshold to generate a digital comparator output. D-type flip-flops are arranged to receive the comparator output to generate first and second pulses respectively in response to a data strobe clock pulse. The time difference between the first and second pulses is detected to generate an error voltage which is applied to the comparator as the variable threshold to keep the crossing points of the eye pattern of the received signal constantly aligned on the threshold level. A variable width monostable multivibrator is responsive to synchronization pulses to generate the data strobe clock pulses with a duration that is a function of the difference between each period of the first and second pulses and one-half period of a third pulse generated by a D-type flip-flop in response to the leading edge transition of the output of the monostable multivibrator in the presence of the first and second pulses. Output pulses are regenerated in response to the output of the monostable multivibrator in the presence of the comparator output.

REFERENCES:
patent: 3757051 (1973-09-01), Girard et al.
patent: 3986053 (1976-10-01), Doemer
patent: 4051473 (1977-09-01), Hooker, Jr.

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