Phase Noise Analysis of a Modified Cross Coupled Oscillator

This paper presents a rigorous theoretical phase noise analysis of a modified cross coupled oscillator. A closed-form formula is derived of the phase noise in the 1/f 2 region. To verify the derived results, the results are validated against the simulations and illustrate good matches. The overall phase noise error has less than 3 dB error over the offset frequencies from the carrier. The oscillator is designed in a 0.18um CMOS process at 2.3GHz with the phase noise of about 125dBc/Hz at offset frequency of 1MHz while it draws 1.3 mA from 1.8V supply.