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:
Dec. 06, 2011
Filed:
Dec. 19, 2008
Weihong Qiu, San Jose, CA (US);
Shangyang Xiao, Sunnyvale, CA (US);
Kun Xing, Cary, NC (US);
Intersil Americas Inc., Milpitas, CA (US);
Abstract
A current sensing circuit with AC and DC temperature compensation for sensing current through an output inductor which has an inherent DC resistor with a temperature varying resistance. A first RC circuit is coupled across the output inductor and has a time constant. The first amplifier provides a sense signal indicative of voltage of the first RC circuit. The second RC circuit is coupled to a first correction node and receives the sense signal. The second resistor has a temperature varying resistance so that the second RC circuit has a time constant commensurate with a time constant of the output inductor. The third RC circuit is coupled to a second correction node and has a time constant equal commensurate with the first RC circuit. The second amplifier provides a corrected sense signal based on the correction nodes.