tailieunhanh - Báo cáo hóa học: "Parametric Conversion Using Custom MOS Varactors?"

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: Parametric Conversion Using Custom MOS Varactors | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 12945 Pages 1-16 DOI WCN 2006 12945 Parametric Conversion Using Custom MOS Varactors Howard Chan 1 Zhongbo Chen 1 Sebastian Magierowski 1 and Krzysztof Kris Iniewski2 1 Department of Electrical and Computer Engineering University of Calgary Calgary AB Canada T2N1N4 2 Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada T6G 2V4 Received 14 October 2005 Revised 17 April 2006 Accepted 18 April 2006 The possible role of customized MOS varactors in amplification mixing and frequency control of future millimeter wave CMOS RFICs is outlined. First the parametric conversion concept is revisited and discussed in terms of modern RF communications systems. Second the modeling design and optimization of MOS varactors are reconsidered in the context of their central role in parametric circuits. Third a balanced varactor structure is proposed for robust oscillator frequency control in the presence of large extrinsic noise expected in tightly integrated wireless communicators. Main points include the proposal of a subharmonic pumping scheme based on the MOS varactor a nonequilibrium elastance-voltage model optimal varactor layout suggestions custom m-CMOS varactor design and measurement device-level balanced varactor simulations and parametric circuit evaluation based on measured device characteristics. Copyright 2006 Howard Chan 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 Variable capacitors can play a very rich role in radio-frequency RF transceivers. In this paper we examine their use in two key front-end functions amplification and frequency control. Parametric amplification a relatively uncommon technique is promoted in this .

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