介紹了ISO15693非接觸式IC卡射頻前端電路，采用了一種巧妙的整流電路，提高了整流效率。同時使用了一種適用于ISO15693非接觸式卡片的簡單的穩壓電路結構，有助于信號的解調，并且使卡片在接收到的信號為10%ASK和100%ASK兩種調制模式時都能正常工作。芯片測試結果顯示：電源產生電路能夠產生2.2V~3.8V的直流電壓，解調電路能夠在2.0V~3.8V電壓下可靠穩定的工作；在ISO15693規定的最小場強0.15A/M處，整個芯片的電源電壓為3.3V,且功耗小于60μW。
關鍵詞：ISO15693；非接觸式IC卡；整流電路；電源產生電路；解調電路
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