An Active Inductor Based Quadrature-VCO in 90nm Process for IEEE 802.11b Applications

This work presented here a dissertation which proposed a quadrature voltage-controlled oscillator (QVCO) based on tunable active inductor for IEEE 802.11b applications in 90nm CMOS process. The designed QVCO achieves an oscillation frequency of tuning ranges from 2.25GHz to 3.25GHz having tuning scope of 36.36%, while varying tuning voltages ranging from 0.4V to 0.8V. The QVCO provides a differential output power of 0.933dBm to -2.67dBm. The simulated phase noise varies from -85.25dBc/Hz to -80.92dBc/Hz and the QVCO exhibits DC power consumption of 1.82mW to 4.05mW. Figure of merit (FoM) of -148.99dBc/Hz observed @ 2.77GHz frequency. Moreover, a systematic analysis of QVCO on various techniques such as process corner analysis (SS, SF, FS &FF), Monte Carlo simulation (for process variation & mismatch), temperature swept analysis and stability analysis are performed to determine the design's compatibility in multifarious environment. Finally, the proposed design's performance parameters are compared with other references in a tabular form and the comparison shows that the state-of-arts outdo most of the mentions.