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:
Apr. 23, 2013
Filed:
Jul. 07, 2011
Yoshiyuki Kurokawa, Sagamihara, JP;
Takayuki Ikeda, Atsugi, JP;
Masami Endo, Atsugi, JP;
Hiroki Dembo, Isehara, JP;
Daisuke Kawae, Isehara, JP;
Takayuki Inoue, Atsugi, JP;
Yoshiyuki Kurokawa, Sagamihara, JP;
Takayuki Ikeda, Atsugi, JP;
Masami Endo, Atsugi, JP;
Hiroki Dembo, Isehara, JP;
Daisuke Kawae, Isehara, JP;
Takayuki Inoue, Atsugi, JP;
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Abstract
In a case where an ASK method is used for a communication method between a semiconductor device and a reader/writer, the amplitude of a radio signal is changed by data transmitted from the semiconductor device to the reader/writer when data is not transmitted from the reader/writer to the semiconductor device. Therefore, in some cases, the semiconductor device mistakes data transmitted from the semiconductor device itself for data transmitted from the reader/writer to the semiconductor device. The semiconductor device includes an antenna circuit, a transmission circuit, a reception circuit, and an arithmetic processing circuit. The antenna circuit transmits and receives a radio signal. The transmission circuit outputs to the reception circuit a signal showing whether or not the antenna circuit is transmitting the radio signal.