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. 24, 2005
Filed:
Sep. 24, 2003
Temperature detection from differences in off leak currents of nmos and pmos transistors on cpu chip
Yasuhiro Tokunaga, Kanagawa, JP;
Yasuhiro Tokunaga, Kanagawa, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A temperature detection circuit is provided inside a chip which is the same in which a CPU is provided, and includes a temperature detection part having a PMOS transistor and an NMOS transistor connected in series between a power supply potential VDD and a grounding potential. A stray capacitance between a junction (live node) between the PMOS transistor and the NMOS transistor, and the grounding potential, is charged with a current differential between the off leak current of the PMOS transistor and the off leak current of the NMOS transistor, thereby changing the potential of the live node. When the changed potential reaches a level of a threshold value in a given period of time, it is decided that the temperature of the CPU reaches a set temperature.