A 5.8 GHz Implicit Class-F VCO in 180-nm CMOS Technology

In this paper, a new Class-F mode voltage-controlled oscillator (VCO) structure is presented. The VCO consists of two LC tanks to get two impedance peaks instead of using a transformer, which leads to a simpler design. The tuning range is from 5.49GHz to 6.19GHz and it consumes only 5.6mW with 0.8V power supply. The measured phase noise at 5.86GHz is -118dBc/Hz@ 1MHz and the figure of merit (FOM) is 186. The VCO is fabricated in 180-nm CMOS technology and occupies a die area of 0.78×0.86mm
²
.