Phase locked loop NRZ data repeater

Details Phase locked loop NRZ data repeater Phase locked loop NRZ data repeater

1975-09-02

1976-11-16

Robinson, Thomas A.

Telegraphy

Repeaters

Using transistors

178 69A, 178 695R, 325 42, H04L 2520, H03D 318

Patent

active

039925811

ABSTRACT:
A phase locked loop repeater for reshaping a non-return to zero (NRZ) data stream. A transition detector receives the input data stream from a coaxial cable in a degraded condition in terms of amplitude and phase distortion and produces reference pulses whose positions are very nearly independent of the direction of the transition of the input data. These reference pulses, along with clock pulses from a voltage controlled oscillator (VCO), are applied to a phase comparator and when these signals differ in phase, a voltage is developed for modifying the frequency of the VCO. The clock signals from the VCO are applied to the clock input of a D-type (edge triggered) flip-flop, to which is also applied the incoming data stream. The D-type flip-flop changes state in accordance with the incoming data only at the leading or trailing edge of the clock pulses. As such, the timing and amplitude of the data stream is reconstructed for reapplication and further transmission on said coaxial cable.

REFERENCES:
patent: 3593044 (1971-07-01), McNeilly et al.
patent: 3878334 (1975-04-01), Halpern

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