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:
Mar. 23, 2004
Filed:
Oct. 25, 2002
Roy W. Berquist, Toddville, IA (US);
Other;
Abstract
A rubidium frequency standard is compensated for frequency variations over temperature by allowing the rubidium frequency standard to vary while holding the output frequency constant. A voltage controlled crystal oscillator, locked to a physics package, provides the output signal. A temperature sensor senses temperature and proves a temperature signal to a microcontroller. A frequency synthesizer receives the output signal from the voltage controlled crystal oscillator as a reference and provides an RF signal to the physics package. The microcontroller looks up a frequency error in a memory in accordance with the temperature signal, generates an offset control word for the frequency synthesizer to compensate for the temperature and adjusts the VCXO with an error signal to compensate for temperature.