The power consumption of an LC-tank oscillator is strongly affected by the varactor quality factor, whether the inductor is on-or off-chip. This paper proposes a new solution to realize high-Q, highly tunable on-chip varactors in a standard CMOS process, achieving a quality factor higher than 100 at 1 GHz, for a tuning ratio of 2. Other solutions are described and their respective advantages compared, while their characteristics are measured for a O S pm process.
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