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. 30, 2013
Filed:
Oct. 12, 2011
Frode Milch Pedersen, Trondheim, NO;
Kristoffer Ellersgaard Koch, Trondheim, NO;
Ronan Barzic, Tiller, NO;
Erwin Dotzauer, Roggenburg, DE;
Frode Milch Pedersen, Trondheim, NO;
Kristoffer Ellersgaard Koch, Trondheim, NO;
Ronan Barzic, Tiller, NO;
Erwin Dotzauer, Roggenburg, DE;
Atmel Corporation, San Jose, CA (US);
Abstract
A device includes an RC oscillator circuit and incorporates various features that individually and in combination can help improve the stability or accuracy of the oscillator output frequency. The oscillator circuit is operable to provide a tunable output frequency and includes a bias circuit switchable between first and second modes of operation. One of the modes has less drift in oscillator bias current relative to the other mode. The device also includes drift compensation circuitry that is operable to compensate for drift in the oscillator output frequency in a closed-loop mode of operation based on a comparison of the oscillator output frequency with a reference frequency. The device further includes a processor operable to compensate for temperature-based drift in the oscillator frequency in an open-loop mode of operation based on a measured temperature value in the vicinity of the oscillator circuit.