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. 12, 2002
Filed:
Apr. 26, 1999
Applicant:
Inventors:
James B. Nolan, Chandler, AZ (US);
Ryan Scott Ellison, Mesa, AZ (US);
Assignee:
Microchip Technology Inc., Chandler, AZ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 3/0231 ;
U.S. Cl.
CPC ...
H03K 3/0231 ;
Abstract
Several calibration techniques for a precision relaxation oscillator with temperature compensation produces a stable clock frequency over wide variations of ambient temperature. The calibration techniques provide for different methods of determining CTAT current, PTAT current or the ratio of PTAT current to CTAT current. The calibration techniques provide different methods for determining CTAT and PTAT calibration values and for setting CTAT and PTAT calibration select switches.