| 摘要 |
#CMT# #/CMT# The circuit has a shorting circuit (302) coupled to a power circuit (305), and a control circuit (303) coupled to the shorting circuit. The control circuit selectively activates and deactivates the shorting circuit and correspondingly activates or deactivates the power circuit, where the power circuit is shorted with an interface circuit (301). A programmable memory circuit (304) is coupled to the control circuit and stores a logic state and maintains the stored logic state. The memory circuit drives the control circuit corresponding to stored logic state. #CMT# : #/CMT# An independent claim is also included for a method to disable an electronic identification device. #CMT#USE : #/CMT# Used for deactivating a contact less identification device (claimed) e.g. smart card, radio frequency identification tag, that is utilized to access or authenticate data within an electronic device e.g. mobile phone, personal digital assistant, or electronic document e-passport, driver license, marriage certificate, and birth certificate, and also utilized in applications that need to protect personal information and/or deliver secure transaction, such as transit fare payment card, government and corporate identification card, electronic passports and visa, and financial payment card. #CMT#ADVANTAGE : #/CMT# The control circuit selectively activates and deactivates the power circuit, where the power circuit is shorted with the interface circuit, thus avoiding the power flow to the circuit in a radio frequency identification tag, and hence deactivating the identification tag permanently. The programmable memory logic circuit maintains the stored logic state without the need of power supply from a power source. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a circuit diagram of a device capable of deactivating an RFID device. Gnd : Ground reference vdd : Supply voltage 401, 402, 403, 404 : Power supply transistors 405, 406 : Transistor pair 407 : Control transistor 408, 409 : Shorting transistors 410 : Memory device 411 : Control gate line 421 : Bias resistor 422 : Capacitor #CMT#INDUSTRIAL STANDARDS : #/CMT# The contact less identification device utilizes a contact less smart card technology, based on the ISO/IEC 14443standard specification. |
