Bit synchronizer for NRZ data

Details Bit synchronizer for NRZ data Bit synchronizer for NRZ data

1993-03-16

1995-07-04

Chin, Stephen

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

341 68, 375362, 375376, 327 2, H04L 700

Patent

active

054307724

ABSTRACT:
A bit synchronizer for NRZ data wherein a loop gain of a phase locked loop in the bit synchronizer is not varied sensitively to bit pattern and rate of the NRZ data and a voltage control led oscillator in the bit synchronizer oscillates synchronously with a multiple of a frequency of an external reference clock pulse even in the absence of NRZ data transitions or over a wide range of variation of a clock frequency of the voltage controlled oscillator, so that the NRZ data and clock can be recovered stably, According to the invention, the bit synchronizer comprises a phase comparator, a first gain controller, a frequency comparator, a second gain controller, a N-frequency divider, a low pass filter and a voltage controlled oscillator.

REFERENCES:
patent: 4611336 (1986-09-01), Fryer
patent: 4965814 (1990-10-01), Yoshida et al.

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