摘要: CMOS varactors are important components for the integration of tunable RF filters and VCOs. This paper presents a performance evaluation comparison three different types based on measurements. The tested varactor are: (i) {p}^+-to-n-well junction, (ii) standard mode nMOS, (iii) accumulation nMOS. each type with respect to capacitance ratio quality factor Q is evaluated at 2 GHz. Further, it shown how these must be configured in LC-tank circuits optimum performance. Finally, compared concluded that Standard Mode nMOS seems best choice applications.
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