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We present a general circuit-based model of LC oscillator phase noise applicable to both white noise and 1/f noise. Using Kurokawa theory, differential equations governing the relationship between amplitude and phase noise at the tank are derived and solved. Closed form equations are obtained for the IEEE oscillator phase noise for both white and 1/f noise. These solutions introduce new parameters which take into account the correlation between the amplitude noise and phase noise and link them to the oscillator circuit oper-ating point. These relations are then used to obtain the nal expression for Voltage noise power density across the output oscillator terminals assuming the noise can be modeled by stationary Gaussian processes. For white noise, general conditions under which the phase noise relaxes to closed-form Lorentzian spectra are derived for two practical limiting cases. Further, the buffer noise in oscillators is examined. The forward contribution of the buffer to the white noise oor for large offset is expressed in terms of the buffer noise parameters. The backward contribution of the buffer to the oscillator noise is also quantied. To model icker noise, the Kurokawa theory is extended by modeling each 1/f noise pertur