IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Online ISSN : 1745-1337
Print ISSN : 0916-8508
Special Section on Analog Circuit Techniques and Related Topics
A 1.2-3.2GHz CMOS VCO IC Utilizing Transformer-Based Variable Inductors and AMOS Varactors
Qing LIUYusuke TAKIGAWASatoshi KURACHINobuyuki ITOHToshihiko YOSHIMASU
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2011 Volume E94.A Issue 2 Pages 568-573

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Abstract

A novel resonant circuit consisting of transformer-based switched variable inductors and switched accumulation MOS (AMOS) varactors is proposed to realize an ultrawide tuning range voltage-controlled-oscillator (VCO). The VCO IC is designed and fabricated using 0.11µm CMOS technology and fully evaluated on-wafer. The VCO exhibits a frequency tuning range as high as 92.6% spanning from 1.20GHz to 3.27GHz at an operation voltage of 1.5V. The measured phase noise of -120dBc/Hz at 1MHz offset from the 3.1GHz carrier is obtained.

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© 2011 The Institute of Electronics, Information and Communication Engineers
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