Cellular transceivers today need to support multiple standards from 2G to 4G in different networks all over the world in order to be competitive globally. To meet this demand, the frequency range of local oscillation (LO)-signals of transceivers must be substantially wide. LO-signals must also satisfy the stringent phase noise requirements of each standard. Thus, the design of a wideband LO-signal generator (LO-generator) for a multi-standard and multi-band cellular transceiver is very challenging.
In this talk, various circuit techniques, which are capable of addressing issues on LO-generation, are introduced. In addition, new low-jitter clock generating architectures, based on injection-locking, are presented briefly.
Jaehyouk Choi received the B.S. degree (summa cum laude) in electrical engineering from Seoul National University in 2003, and the M.S. and Ph.D. degrees in electrical and computer engineering from the Georgia Institute of Technology, Atlanta, USA, in 2008 and 2010, respectively. From 2010 to 2011, he was with Qualcomm, Inc., San Diego, USA, where he was involved in designing multi-standard cellular transceivers. In 2012, he joined Ulsan National Institute of Science and Technology (UNIST), Ulsan, Korea, where he is currently an Assistant Professor of electrical and computer engineering. His research interests include low power and high performance analog and RF integrated circuits for multi-standard cellular transceivers and emerging wireless standards.