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This paper presents a 2.4 GHz LC digitally controlled oscillator (DCO) at near-threshold supplies (0.5~0.7 V). It was a challenge to achieve a low voltage, low power, and high resolution simultaneously. DCOs with metal oxide semiconductor (MOS) varactors consume low power, but their resolution is limited. ΔΣ-DCOs can achieve a high resolution at the cost of high power consumption. A multi-stage capacitance shrinking technique was proposed in this paper to address the tradeoff mentioned above.doi:10.3390/electronics8111336 fatcat:m2hmqurtdfbcxcrwifyfhs5epu