Low jitter clock generator for multiple lanes high speed data transmitter

摘要

The present disclosure provides a clock generator circuit comprising a master clock generator unit configured to generate a master clock signal, and a plurality of slave phase locked loop units. Each of the plurality of slave phase looked loop units is configured to receive the master clock signal as an input reference signal and a corresponding source clock signal. The slave phase locked loop unit may comprise an inner loop and an outer loop. The inner loop may comprise a frequency synthesizer locked on a master clock signal received from a master clock generator unit, while the outer loop may comprise a binary phase detector, an output of which goes to a loop filter with proportional and integral action, controlling the inner loop frequency value via a sigma delta input.

主权项

1. A clock generator circuit comprising:
a master clock generator unit configured to generate a master clock signal; and a plurality of slave phase locked loop units, each configured to receive the master clock signal as an input reference signal and a corresponding source clock signal, wherein:
each of the plurality of slave phase locked loop units is a dual loop slave phase lock loop unit that comprises an inner loop and an outer loop, andthe inner loop comprises a frequency synthesizer locked on the master clock signal received from the master clock generator unit.