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. 22, 2012
Filed:
Oct. 02, 2009
Yuki Hata, Kanagawa, JP;
Koichiro Kamata, Kanagawa, JP;
Yuki Hata, Kanagawa, JP;
Koichiro Kamata, Kanagawa, JP;
Abstract
The semiconductor device includes an antenna, a rectifier circuit, a first protection circuit, and a second protection circuit. The antennagenerates AC voltage. The rectifier circuitrectifies the AC voltage and generates internal voltage Vin. The first protection circuitincludes a first diodeand a second diode. The second protection circuitincludes a capacitorand a transistor. In the case where the absolute value of the AC voltage generated in the antennais larger than a certain value, the first protection circuitcuts the surplus. The second protection circuitfunctions in the case where the level of the internal voltage Vin generated in the rectifier circuitis high. By changing resonant frequency, the second protection circuitcan decrease the number of signals input to the semiconductor device.