A 197 dBc/Hz FoMT 24.8-28.97 GHz Class-F VCO Using Single-Turn Multi-Tap Inductor

This paper presents a low phase noise mmWave Class-F Voltage Controlled Oscillator (VCO) using a novel single-turn multi-tap (STMT) inductor. The proposed STMT based LC tank performs inductive division, thus achieving higher gate voltage swing. The proposed design operates as a Class-F oscillator with an auxiliary third harmonic impedance peak. Tail filtering has been used as a second harmonic trap. The VCO designed in 65 nm CMOS process operates from 24.8 to 28.97 GHz. The VCO shows phase noise of -84.87 dBc/Hz and -110 dBc/Hz at 100kHz and 1MHz offset respectively at 28.89 GHz and FoM
T
of 197 dBc/Hz at /MHz offset while consuming 4 mW of DC power for a tuning range of 15.51%.