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. 25, 2007
Filed:
Jun. 07, 2005
Hi-hyun Han, Ichon-shi, KR;
Jun-gi Choi, Ichon-shi, KR;
Hi-Hyun Han, Ichon-shi, KR;
Jun-Gi Choi, Ichon-shi, KR;
Hynix Semiconductor Inc., Kyoungki-Do, KR;
Abstract
A digital temperature sensing device uses temperature depending characteristic of contact resistance of a MOS transistor and a self-refresh driving device adjusts its self-refresh period depending on temperature using the digital temperature sensing device. The self-refresh driving device includes a first reference voltage generating unit for generating a reference voltage robust to temperature, the first reference voltage generating means being formed with a plurality of MOS transistors, the number of source contacts of the MOS transistors being adjusted such that variation of saturation current through source-drain is compensated for; a second reference voltage generating unit for generating a second reference voltage sensitive to temperature; a level comparator for comparing the first reference voltage with the second reference voltage; and an oscillator for generating a clock signals having differing period depending on the output signal of the level comparator.