Michael Chan Adam Postula Yong Ding PLLSim - An Ultra Fast Bang-Bang Phase Locked Loop Simulation Tool. 74-79 2007 conf/aspdac/2007 ASP-DAC http://doi.ieeecomputersociety.org/10.1109/ASPDAC.2007.357795 db/conf/aspdac/aspdac2007.html#ChanPD07