Optimization of phase-locked loop circuits via geometric programming. - David M. Colleran; Clemenz L. Portmann; Arash Hassibi; César A. R. Crusius; Sunderarajan S. Mohan; Stephen P. Boyd; Thomas H. Lee; Maria del Mar Hershenson (CICC, 2003)

Differential ring oscillators with multipath delay stages. - Srikanth S. Mohan; W. S. Chan; David M. Colleran; S. F. Greenwood; J. E. Gamble; I. G. Kouznetsov (CICC, 2005)