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Design of high-Q varactors for low-power wireless applications using a standard CMOS process

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4 Author(s)
Porret, A.-S. ; Swiss Fed. Inst. of Technol., Lausanne, Switzerland ; Melly, T. ; Enz, C.C. ; Vittoz, E.A.

New applications such as wireless integrated network sensors (WINS) require radio-frequency transceivers consuming very little power compared to usual mainstream applications, while still working in the ultra-high-frequency range. For this kind of application, the LC-tank-based local oscillator remains a significant contributor to the overall receiver power consumption. This statement motivates the development of good on-chip varactors available in a standard process. This paper describes and compares the available solutions to realize high-Q, highly tunable varactors in a standard digital CMOS submicrometer process. On this basis, quality factors in excess of 100 at 1 GHz, for a tuning ratio reaching two, have been measured using a 0.5-/spl mu/m process.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:35 ,  Issue: 3 )
RFIC Virtual Journal, IEEE