0.18 ㎛ CMOS Quadrature VCO for IEEE 802.11a WLAN Application

The proposed CMOS Quadrature VCO for WLAN application was designed in TSMC 0.18 ㎛ RF CMOS technology. The QVCO based on NMOS back-gate as a coupling transistor and switched capacitors array without tail transistors is designed to generate quadrature output signals. The simulated results show that the QVCO core consumed 3.67 ㎃ and 6.6 ㎽ from a 1.8 V supply. The QVCO is tunable between 4.76 ㎓ ~ 6.35 ㎓ and has a phase noise lower than -116.8 ㏈c/㎐ at 1 ㎒ offset over the entire tuning range