摘要介绍基于 STMicroelectronics 公司 CRX14 芯片设计的TypeB 射频系统,工作频率为 13.56MHz,NRZ编码,波特率为 106kb/s。阅读器(PCD)到卡(PICC)调制采用10%的ASK,卡(PICC)到阅读器(PCD)调制采用相位键控调制的 8 4 7 k H z 负载调制的副载波。
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