Woogeun Rhee, PhD, is a Professor at the School of Integrated Circuits, Tsinghua University, Beijing. He has over 25 years of professional career experience in integrated circuit design with nearly 10 years in industry and 16 years in academia. Dr. Rhee is one of a few researchers who made significant contributions to PLL architectures and circuits not only within different careers (academia and industry) but also over different fields (wireless and wireline systems). He is an IEEE Fellow. Zhiping Yu, PhD, is a Professor at the School of Integrated Circuits, Tsinghua University, Beijing. He is an IEEE Life Fellow with over 400 published papers on subjects related to ICCAD, nanoelectronics and RF circuit design.