11 10月 2021

Made an RFID Tester – for HF&UHF Tags

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高频射频卡的应用非常广泛，例如金融支付、人员出入管理、产品溯源、车间定位、巡检记录等。
该品卡主要工作于13.56MHz频段，包含多个协议种类，例如15693、14443A\B等。
射频卡的射频性能和协议一致性测试是射频卡和读写器设计和生产过程中的重要环节。
我们使用Xilinx的FPGA实现了一款低成本的RFID特性测试仪，并配合C#上位机软件。
The parameters are as follows:
① Spartan 3E-1200K main controller, onboard RAM and ROM.
② The highest rate of the UART interface is up to 1.5Mbps, which is used for PC communication.
③ 0-30MHz arbitrary waveform generator, built-in 165Msps 12bit DA converter, which can provide the voltage range of 50mVp-p to 10Vp-p between the frequency of 0-15MHz.
④ The 100MH bandwidth 12bit AD converter can perform low-pass and band-pass sampling.
⑤ Used for 13.56MHz ISO15693, ISO14443 and other high-frequency RFID transceiver test, signal modulation and demodulation analysis, and  carrier generation.
⑥ It can be used for the processing and analysis of 915MHz baseband signals or down-conversion signals.
测试仪的设计非常复杂，甚至包含更高频率的频率分析、调制分析、协议分析等内容。
Based on this equipment, we have developed another very high-end RFID test board, using the 14-layer microwave Rogers PCB and Xilinx SOC chip ZYNQ, which contains ARM A9 processors and a powerful FPGA. It supports the QAM modulation and demodulation with frequencies up to 2.4GHz carrier. Besides, we also designed a circular polarization cut-angle microstrip antenna for 915MHz.
VHDL设计的FPGA模块框架。

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