Jun Zou Daniel Mueller Helmut E. Graeb Ulf Schlichtmann A CPPLL hierarchical optimization methodology considering jitter, power and locking time. 19-24 2006 conf/dac/2006 DAC http://doi.acm.org/10.1145/1146909.1146919 db/conf/dac/dac2006.html#ZouMGS06