A 210.4-dBc/Hz FoMT 67.9% Tuning Range LC-VCO IC with a Single Analog Voltage-Controlled Novel Varactor in 40-nm CMOS SOI

This paper presents a wideband VCO IC with a single analog voltage-controlled novel varactor. The novel varactor which consists of two parallel Inversion-MOS (IMOS)-based varactors and a variable resistor is tuned by a single analog voltage. Two IMOS-based varactors are biased at different gate-to-source voltages so that K VCO can be improved while the variable resistance contributes to the extension of the tuning range. The proposed VCO IC is designed, fabricated, and fully evaluated on-wafer in 40-nm CMOS SOI. The proposed wideband VCO IC delivers a tuning range of 67.9% from 3.20 to 6.49 GHz and has exhibited an excellent measured FoMT of 210.4 dBc/Hz under the minimum power consumption of only 0.35 mW.