Summary

In this chapter, expressions for the power spectral density of the noise at the end of the two branches of the ETSI model have been obtained. These will be subsequently used in section 6 in order to estimate the TDEV of the time error at the model output. Similar expressions were also derived for the power spectral density of flicker phase and white phase noise sources at the output of the phase detector and VCO of a phaselock loop. The ETSI model and PLL expressions were compared to show their equivalence. This highlighted the assumptions inherent in the ETSI model. The applicability of the model to Primary Reference Clocks was also discussed. An extension to the model was proposed in order to simulate an important attribute of synchronisation clocks. The subsequent chapter uses the TDEV approximation that has been presented in order to obtain asymptotic expressions for the TDEV behaviour of the clock model. These approximations will allow the shape of the wander masks to be explained as well as bounds on the gain parameters to be obtained.