An Error Monitoring and Correction Circuit for Clocks

Abstract

A clock synchronization circuit is described which can monitor and remove positive and negative errors less than 500 ms. An additional logic circuit increases the correction range to ± 30 seconds and is applicable to clocks which accumulate larger errors. The synchronization can work with several reference time signals or with a master clock directly. The circuit is inherently capable of providing a synchronization accuracy of about a microsecond but is limited by the propagation errors where transmitted time signals are used.

Indexing Terms:

• Clock Synchronization
• Time
• Logic Circuits
• Electronic Clocks