A NEW METHOD OF MEASUREMENT OF THE DIFFERENT TYPES OF NOISE ALTERING THE OUTPUT SIGNAL OF OSCILLATORS

Oscillator noise is generally modeled by a power law spectral density. Thus it is possible to characterize different noise sources, each of them corresponding to a particular power law. The measurement of the c ontribution of these sources is necessary to know their origin and to remedy these causes in order to improve oscillator performance. Usuall y, an estimation of the different types of noise present in a signal i s obtained by using a variance. However, the sensitivity of these vari ances differs for each type of noise and then limits this method. On t he other hand, the use of several variances, each of them more sensiti ve to one type of noise, permits one to notably improve the measuremen t accuracy. The method suggested here uses as many different variances as there are types of noise to measure. The improvement of measuremen t accuracy of the noise coefficient is discussed in this paper.