Design of a RF front-end circuit of contactless IC cards for ISO15693
QIN Yan-qing, GE Yuan-qing
(Institute of Microelectronics, Tsinghua University, Beijing 100084, P.R.China)
Abstract: A RF front-end circuit is designed for contactless IC cards complying with ISO15693. A novel rectifier is designed to enhance the efficiency of rectification. A simple limiter structure is introduced, which is applicable in contactless IC cards, and it is helpful to the demodulation of the signal. This limiter can also help the above cards work normally when the received signal is10% ASK or 100% ASK modulating mode. Test results show that the power generation circuit can provide a DC supply voltage from 2.2V to 3.8V. The demodulation circuit can work properly and steadily from 2.0V to 3.8V. Power consumption is less than 60uW at 3.3V, when the whole chip works at the minimum operating field 0.15A/M, which is prescribed in ISO15693.
Key words: ISO15693; contactless IC cards; rectifier; power generation circuit; demodulation circuit
EEACC: 1205; 1250