The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 1986
Filed:
May. 31, 1983
Gary D Southard, Coral Springs, FL (US);
Siemens Corporate Research & Support, Inc., Iselin, NJ (US);
Abstract
A clock pulse generator system for providing a highly stable clock signal consists of two separate redundant clock signal generators which are controlled to operate in dead synchronization with each other. A microprocessor controlled digital phase lock loop operates to control each of the two clock signal generators and selects among a plurality of operating states such that the average dynamic phase difference in the two clock pulse signals generated is practically zero. Furthermore, the instantaneous dynamic phase difference does not exceed the phase noise of the voltage controlled crystal oscillators of the phase lock loops and, in one embodiment, is normally less than ten pico seconds, each phase lock loop comprising means for performing a fine, as well as coarse, phase comparison among internally or externally generated reference signals, only one of which is the highly stable clock signal output.