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This paper presents recent advances in technologies, architectures, and applications of highly-integrated low-power radars. Both mm-wave transceiver and baseband DSP have been discussed. The evolution in semiconductor technologies allows the low-cost and low-power integration of mm-wave radar transceiver and DSP unit in the same CMOS chip with performances suitable for several radar applications: automotive, e-health, security, vital signs detection to name just a few. Since DSP and A/D converter are already available as single-chip CMOS solutions we foresee the future migration from single-board radar to single-package or even single-chip radar systems. For SRR operating at several tens of GHz the on-chip integration of the antenna becomes feasible.