Simulation of phase noise generated by white noise in 1.7 GHz CMOS LC oscillator

The phase noise resulting from upconversion of white noise in a CMOS LC osc illator is investigated. HSPICE simulations of phase noise resulting from t he random-phase white noise in a 1.7GHz CMOS LC oscillator have been perfor med and demonstrate that the phase noise resulting from the upconversion of white noise has a 1/f(2) dependence on the offset frequency and becomes la rger as the white noise increases. The results provide a confirmation by ci rcuit simulations of Leeson's empirical formula, and provide a technique fo r the design of low noise oscillators.