This paper presents the design of a 60GHz Quadrature Digitally-Controlled Oscillator for a low-power Frequency-Modulated Continuous Wave radar System-on-Chip. The accurate detection of vital signs requires 1 and Q demodulation of the received signal. The quadrature coupling is exploited to achieve a seamless and ultra wide frequency tuning range of 11 GHz. The oscillator is designed for integration in an All-Digital Phase-Locked Loop. The presented technique allows to simplify the interface with the digital loop filter without the need for an extensive calibration. A wide-band and low-power divider chain is designed as well using dynamic topologies. The circuits are integrated in GF 22-nm FDX CMOS technology and consume between 12.8 and 22.4 mW across the frequency range (17.6 mW on average) with a supply voltage of 0.8V.