Porret, A.-S.Melly, T.Enz, C. C.Vittoz, E. A.2010-06-242010-06-242010-06-24200010.1109/4.8268152-s2.0-0033904349https://infoscience.epfl.ch/handle/20.500.14299/51204New 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 applications, 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-μm process.Device ModelingCMOSRFLow-Powertext::journal::journal article::research article