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发明公开
CN104579175A 射频识别中的负载调制电路 有权

射频识别中的负载调制电路
摘要：
本发明公开了一种射频识别中的负载调制电路，包括一与耦合电路相连接的第一负载调制模块的第二负载调制模块；在小场强时，负载调制的工作主要由第一负载调制模块完成，第二负载调制模块对负载调制波形和负载调制深度的贡献远小于第一负载调制模块；随着场强的增加，第一负载调制模对负载调制波形和负载调制深度的贡献逐渐减小；随着场强的增加，在可变电压的控制下，第二负载调制模块对负载调制波形和负载调制深度的贡献逐渐增加；在大场强时，负载调制的工作主要由第二负载调制模块完成。本发明能较好的改善大场强下的负载调制波形和负载调制深度，提升射频识别卡片的兼容性，保证射频识别卡片和读卡机之间的正常通讯。
摘要（英）：

The invention discloses a load modulation circuit for RFID (radio frequency identification). The load modulation circuit comprises a first load modulation module and a second load modulation module which are connected with a coupling circuit, wherein the load modulation is mainly finished by the first load modulation module under low field intensity, and the contribution of the second load modulation module to load modulation waveform and load modulation depth is far smaller than that of the first load modulation module; with increase of the field intensity, the contribution of the first load modulation module to load modulation waveform and load modulation depth is reduced gradually, and the contribution of the second load modulation module to load modulation waveform and load modulation depth is increased gradually under control of variable voltage; and the load modulation is mainly finished by the second load modulation module under high field intensity. The load modulation waveform and load modulation depth under high field intensity can be better improved, the compatibility of an RFID card can be improved, and normal communication between the RFID card and a card reader is guaranteed.

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