文档介绍：Nonlinear Approach to the Calculation of Oscillator Phase Noise Rohde
Nonlinear Approach to the Calculation of Oscillator Phase Noise
By Dr. Ulrich L. Rohde, N1UL
The mechanism of noise generation in an bines the equivalent of frequency
conversion (mixing) with the effect of AM-to-PM conversion. Therefore, to calculate
oscillator phase noise, we must first be able to calculate the noise figure of a mixer [75].
This chapter presents the use of an algorithm for putation of SSB carrier noise in
free running oscillators using the harmonic balance (HB) nonlinear technique.
Traditional approaches relying on frequency conversion analysis are not sufficient to
describe plex physical behavior of a noisy oscillator. The accuracy of this
nonlinear approach is based on the dynamic range of the harmonic balance simulator and
the quality of the parameter extraction for the active device. The algorithm described has
also been verified with several examples up to millimeter wavelengths. This is the only
algorithm that provides plete and rigorous treatment of noise analysis for
autonomous circuits without restrictions such as not being able to handle memory effects.
Noise Generation in Oscillators
As shown above, the qualitative linearized picture of noise generation in oscillators is
very well known. The physical effects of random fluctuatio