tailieunhanh - Báo cáo hóa học: " Modeling and Characterization of VCOs with MOS Varactors for RF Transceivers"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Modeling and Characterization of VCOs with MOS Varactors for RF Transceivers | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 93712 Pages 1-12 DOI WCN 2006 93712 Modeling and Characterization of VCOs with MOS Varactors for RF Transceivers Pedram Sameni 1 Chris Siu 2 Shahriar Mirabbasi 1 Hormoz Djahanshahi 3 Marwa Hamour 1 Krzysztof Iniewski 2 and Jatinder Chana3 1 Department of Electrical and Computer Engineering University of British Columbia Vancouver British Columbia Canada V6T1Z4 2 Department of Electrical and Computer Engineering University of Alberta Edmonton Alberta Canada T6G 2V4 3 PMC-Sierra Burnaby British Columbia Canada V5A 4X1 Received 1 September 2005 Revised 8 March 2006 Accepted 17 May 2006 As more broadband wireless standards are introduced and ratified the complexity of wireless communication systems increases which necessitates extra care and vigilance in their design. In this paper various aspects of popular voltage-controlled oscillators VCOs as key components in RF transceivers are discussed. The importance of phase noise of these key blocks in the overall performance of RF transceivers is highlighted. Varactors are identified as an important component of LC-based oscillators. A new model for accumulation-mode MOS varactors is introduced. The model is experimentally verified through measurements on LC-based VCOs designed in a standard pm CMOS process. Copyright 2006 Pedram Sameni et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION In the recent years the demand for wireless communications has increased considerably. Wireless communication systems encompass a wide variety of standards. Such systems include cellular phones . GSM CDMA wireless local area networks WLANs wireless personal area networks WPANs wireless metropolitan area networks WMANs and so forth. The