A 13.56 MHz CMOS RF identification transponder integrated circuit with a dedicated CPU

Radio-frequency identification (RFID) technology is attracting attention for its growing market in telephony and transport fare collection systems, which are replacing magnetic debit card technology, as well as factory automation and access control systems. In the former systems, the data rate is expected to exceed 100 kb/s, higher than previous results. Complex functions, such as anti-collision and authentication, are indispensable in transponder ICs in spite of the fact that their addition increases power consumption. To achieve the high data rate along with high magnetic field emission from interrogators, the 13.56 MHz ISM band is appropriate for RF power and data transmission. These RF and analog circuits for a 13.56 MHz RFID transponder IC are associated clocking and anti-collision techniques controlled by a dedicated CPU.