English: The second CDR is designed for a larger tolerance, but is slave to the clock of the first .
Its larger tolerance is obtained widening the range of the phase comparator:
1. the use of the elastic buffer eliminates the LEO tolerance limitation for CDR2, because it samples pulses that have been already regenerated ;
2. the range of the phase comparator (or of the shift register, whichever is smaller) becomes the limit to high frequency jitter tolerance in CDR2
The characteristic cut-off frequency of CDR2 is set lower than CDR1, as much as required for de-jittering the output of CDR1.
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