Analytical model design for LC-tank VCO in 0.18µm CMOS

With the increasing demand for high frequency oscillator, low cost CMOS circuit is of crying need. Periodic steady state behavior of cross-coupled LC tank is important as it helps to get oscillation in ultra-low power, low voltage. This study is about evaluating the amplitude of main component, oscillation frequency, non-linear behavior of oscillator, and power consumption of LC-tank VCO. The proposed topology is demonstrated through a fully integrated LC VCO implemented in the 0.18μm CMOS process. A discussion about transistor size, capacitor and inductor value and their effect on oscillation is evaluated in the proposed topology.