초록 ▼

An improved local synchronization module which uses Frequency-phase adaptive double locked loop (FPADLL) to control a stable controllable oscillator is disclosed. A single physical feedback loop is implemented which can operate in either a phase locked loop mode or a frequency locked loop mode. The

An improved local synchronization module which uses Frequency-phase adaptive double locked loop (FPADLL) to control a stable controllable oscillator is disclosed. A single physical feedback loop is implemented which can operate in either a phase locked loop mode or a frequency locked loop mode. The sync module includes a controller which determines in which mode the feedback loop operates. The controller also uses slipping information from a network reference recovery interface to reduce slipping. Also effects of ageing of the stable controllable oscillator are predicted and compensated for.

대표청구항 ▼

[ What is claimed is:] [1.] A synchronization system comprising:a reference signal recovery unit for recovering a reference signal, said reference signal having phase and frequency signal characteristics, said recovery unit including a slip buffer;a controllable signal source for producing an output

[ What is claimed is:] [1.] A synchronization system comprising:a reference signal recovery unit for recovering a reference signal, said reference signal having phase and frequency signal characteristics, said recovery unit including a slip buffer;a controllable signal source for producing an output signal having phase and frequency signal characteristics;a signal detector connected to an output of said recovery unit and an output of said controllable signal source, said signal detector detects signal differences in one of said signal characteristics between said output signals, and produces a difference signal indicative of said differences; anda controller connected to receive said difference signal as an input and to receive an indication from the recovery unit when a slip occurs and for producing a control signal for controlling said controllable signal source in order to reduce slipping.