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A PLL-based 2.5-Gb/s GaAs clock and data regenerator IC

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2 Author(s)
H. Ransijn ; AT&T Bell Lab., Reading, PA, USA ; P. O'Connor

A GaAs IC that performs clock recovery and data retiming functions in 2.5-Gb/s fiber-optic communication systems is presented. Rather than using surface acoustic wave (SAW) filter technology, the IC employs a frequency- and phase-lock loop (FPLL) to recover a stable clock from pseudo-random non-return-to-zero (NRZ) data. The IC is mounted on a 1-in×1-in ceramic substrate along with a companion Si bipolar chip that contains a loop filter and acquisition circuitry. At the synchronous optical network (SONET) OC-48 rate of 2.488 Gb/s, the circuit meets requirements for jitter tolerance, jitter transfer, and jitter generation. The data input ambiguity is 25 mV while the recovered clock has less than 2° rms edge jitter. The circuit functions up to 4 Gb/s with a 40-mV input ambiguity and 2° RMS clock jitter. Total current consumption from a single 5.2-V supply is 250 mA

Published in:

IEEE Journal of Solid-State Circuits  (Volume:26 ,  Issue: 10 )