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:
May. 13, 1997
Filed:
Mar. 12, 1996
Gregory L Schaffer, Cupertino, CA (US);
Maxim Integrated Products, Inc., Sunnyvale, CA (US);
Abstract
Methods and apparatus for improving the temperature drift of references by providing temperature compensation trimmable after packaging of the integrated circuit. In accordance with the method, first, second and third trim parameters are generated and trimmed at wafer sort so that the first parameter is substantially independent of temperature, and at a nominal temperature, the second and third parameters are zero, with the second being proportional to the temperature rise above nominal and the third being proportional to temperature decrease below nominal. After packaging, a component of the first parameter is combined with the output of the reference to obtain the desired output at the nominal temperature, after which a component of the second parameter is combined with the output of the reference to obtain the desired output at a temperature above the nominal temperature, and a component of the third parameter is combined with the output of the reference to obtain the desired output at a temperature below the nominal temperature. The compensation is made permanent by blowing fuses. Various embodiments are disclosed.