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:
Jun. 10, 2008
Filed:
Mar. 31, 2006
Louis J. Nervegna, Somerville, MA (US);
Louis J. Nervegna, Somerville, MA (US);
Silicon Laboratories Inc., Austin, TX (US);
Abstract
A free running clock circuit includes a switching circuit for switching between first and second logic states at a predetermined frequency based upon a trip voltage the switching circuit has a programmable temperature profile associated therewith. The switching circuit includes a comparator circuit that has first and second comparators. The first and second comparators have a reference input connected to receive the trip voltage, and the output of the comparators change logic states between a first logic state and a second logic state when the other input of the comparator passes the trip voltage. The first and second comparators have a programmable offset voltage enabling programming of the programmable voltage supply profile of the switching circuit. An RC timing circuit defines when the outputs of the comparators switch between the first and second logic states by providing a feedback to the other inputs of the two comparators. A temperature compensated trip voltage generator outputs a defined trip voltage that is compensated over temperature to offset the temperature profile of said switching circuit to provide an overall temperature compensated operation for said free running clock circuit.