Phase error analysis of the LC-Tank CMOS quadrature oscillators

Abstract

Using an analytical approach, new estimation of phase error in LC-Tank quadrature oscillators is proposed. The mismatches between passive components of LC tanks are considered as the reasons of the phase error. Closed form equations relating LC mismatches to phase errors are presented. To evaluate the analysis, a 5GHz quadrature LC-Tank oscillator is simulated using TSMC 0.18µm model technology. The results confirm the simplicity and high accuracy of the proposed analysis.