Browse Prior Art Database

Original Publication Date: 1980-Feb-29
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


Frequently it is desirable to synchronize two or more systems operating at different frequencies primarily to eliminate non-coherent noise. In those instances in which the oscillator to be synchronized is of the astable relaxation type (i.e., the oscillator will operate without being triggered and its timing interval is established by capacitive charging), present state of the art requires the synchronizing frequency to be limited to only frequencies higher than the synchronized frequency. The disadvantage of this requirement is that during loss of sync, the oscillator must free run at a frequency lower than the desired synchronized frequency and system performance may be degraded (e.g., due to increased power dissipation). Further-more, the synchronizing capture range must be sufficient to ensure sync lock for the worst case minimum value of the free-running frequency.