Abstract
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 standardm CMOS process.
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Craninckx J, Steyaert M, Miyakawa H: A fully integrated spiral-LC CMOS VCO set with prescaler for GSM and DCS-1800 systems. Proceedings of the IEEE Custom Integrated Circuits Conference, May 1997, Santa Clara, Calif, USA 403-406.
Samori C, Levantino S, Boccuzzi V:A -94 dBc/Hz@100 kHz, fully-integrated, 5-GHz, CMOS VCO with 18 tuning range for Bluetooth applications. Proceedings of IEEE Custom Integrated Circuits Conference, May 2001, San Diego, Calif, USA 201-204.
Walker R: Clock and Data Recovery for Serial Digital Communication. ISSCC short Course, February, 2002
Hajimiri A, Lee TH: A general theory of phase noise in electrical oscillators. IEEE Journal of Solid-State Circuits 1998,33(2):179-194. 10.1109/4.658619
Andreani P, Mattisson S: On the use of MOS varactors in RF VCOs. IEEE Journal of Solid-State Circuits 2000,35(6):905-910. 10.1109/4.845194
Song S-S, Shin H: An RF model of the accumulation-mode MOS varactor valid in both accumulation and depletion regions. IEEE Transactions on Electron Devices 2003,50(9):1997-1999. 10.1109/TED.2003.815599
Porret A-S, Melly T, Enz CC, Vittoz EA: Design of high-Q varactors for low-power wireless applications using a standard CMOS process. IEEE Journal of Solid-State Circuits 2000,35(3):337-345. 10.1109/4.826815
Molnár K, Rappitsch G, Huszka Z, Seebacher E: MOS varactor modeling with a subcircuit utilizing the BSIM3v3 model. IEEE Transactions on Electron Devices 2002,49(7):1206-1211. 10.1109/TED.2002.1013277
Bunch RL, Raman S:Large-signal analysis of MOS varactors in C MOS - LC VCOs. IEEE Journal of Solid-State Circuits 2003,38(8):1325-1332. 10.1109/JSSC.2003.814416
Hegazi E, Abidi AA: Varactor characteristics, oscillator tuning curves, and AM-FM conversion. IEEE Journal of Solid-State Circuits 2003,38(6):1033-1039. 10.1109/JSSC.2003.811968
Levantino S, Samori C, Bonfanti A, Gierkink SLJ, Lacaita AL, Boccuzzi V: Frequency dependence on bias current in 5-GHz CMOS VCOs: impact on tuning range and flicker noise upconversion. IEEE Journal of Solid-State Circuits 2002,37(8):1003-1011. 10.1109/JSSC.2002.800969
Hajimiri A, Lee TH: Design issues in CMOS differential LC oscillators. IEEE Journal of Solid-State Circuits 1999,34(5):717-724. 10.1109/4.760384
Cho H, Burk DE: A three-step method for the de-embedding of high-frequency S-parameter measurements. IEEE Transactions on Electron Devices 1991,38(6):1371-1375. 10.1109/16.81628
Kolding TE: On-wafer calibration techniques for giga-hertz CMOS measurements. Proceedings of IEEE International Conference on Microelectronic Test Structures (ICMTS '99), March 1999, Goteborg, Sweden 105-110.
Sameni P, Siu C, Iniewski K, et al.: Modeling of MOS varactors and characterizing the tuning curve of5–6GHz of LC VCO. Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS '05), May 2005, Kobe, Japan 5071-5074.
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Sameni, P., Siu, C., Mirabbasi, S. et al. Modeling and Characterization of VCOs with MOS Varactors for RF Transceivers. J Wireless Com Network 2006, 093712 (2006). https://doi.org/10.1155/WCN/2006/93712
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DOI: https://doi.org/10.1155/WCN/2006/93712