This paper reports the latest advances on millimeter-wave CMOS voltage-controlled oscillators (VCOs). Current state-of-the-art\r\nimplementations are reviewed, and their performances are compared in terms of phase noise and figure of merit. Low power and\r\nlow phase noise LC-VCO and ring oscillator designs are analyzed and discussed. Design and performance trends over the last\r\ndecade are provided and discussed.The paper shows how for the higher range of millimeter-waves (>60GHz) the performances of\r\nring oscillators become comparable with those of LC-VCOs.
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