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. 12, 1998
Filed:
Feb. 29, 1996
Toshiyuki Matsubara, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Mitsubishi Electric Semiconductor Software Co., Ltd., Hyogo, JP;
Abstract
A non-contact type IC-card with a simplified circuit arrangement which can select one of the PSK- and FSK-modulation methods at data transmission. A resonance frequency switching section is provided to halve the resonance frequency of a transmission and reception antenna. In the case of the PSK-modulation, the resonance frequency of the transmission and reception antenna is halved during one period of the original frequency at a modulation point so that the phase inverts for the phase modulation. In the case of the FSK-modulation, for the frequency modulation the frequency is switched over in accordance with the variation of the data. A PFSEL switch carries out the switching between both the modulation methods.