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:
Feb. 15, 2005
Filed:
Aug. 03, 2001
Hiroyuki Takahashi, Tokyo, JP;
Masatoshi Sonoda, Tokyo, JP;
Atsushi Nakagawa, Tokyo, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
It is an object to provide a timer circuit which exhibits a tendency of decreasing a timer cycle upon a temperature increase and another tendency of increasing the timer cycle upon a temperature decrease. A diode D has a current characteristic depending upon temperature. A forward current flows through an n-type MOS transistor Nwhich forms a primary side of a current mirror. Another current flowing through a p-type MOS transistor Pand an n-type MOS transistor Nwhich form a secondary side of the current mirror is defined depending upon the current flowing through the n-type MOS transistor N. The current flowing through the p-type MOS transistor Pand the n-type MOS transistor Nis supplied as an operating current of a ring oscillator comprising inverters I˜I. Accordingly, a cycle (timer cycle) of a clock signal CLK outputted from this ring oscillator reflects a temperature characteristic of the diode D, wherein the timer cycle is decreased with increasing the temperature.