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:
Aug. 20, 1991
Filed:
Nov. 05, 1990
Yolanda M Pirez, Maimi, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A crystal reference frequency is characterized by determining the compensation signal variations of a compensation signal over temperature for corresponding signal characterization words. The frequency shift variations of the crystal over temperature are determined and the temperature at which the inflection point of the crystal occurs is found. An inflection point characterization word is found which matches the temperature at which the inflection point of the crystal occurs to the temperature at which the inflection point of the compensation signal occurs. The frequency variations of the crystal are correlated to the compensation signal variations and a signal characterization word is selected which substantially minimizes the frequency variations of the crystal over temperature.