This paper analyzes the scaling of LC voltage controlled oscillator (LC-VCO) implemented in advanced planar CMOS technologies. An LC-VCO for GSM applications, has been designed in state-of-the-art 45/40 nm and 32 nm CMOS technologies, exploiting different front- and back-end of line (FEOL/BEOL) options. The designs are compared with each other and with recent literature in terms of power and phase-noise performance