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手册中只看到了这个阻抗，我需要490MHz的射频端口输入阻抗来设计巴伦电路，谢谢！
我们没有490M的设计阻抗的具体数值，获得阻抗的方法通常来自 load-pull 和source-pull测量
对于470-510M设计参考：https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/808147/cc1310-single-ended-tx-rx-optimum-load-source-impedance-for-433mhz-ism-band
https://www.ti.com.cn/cn/lit/an/zhca647/zhca647.pdf
巴伦电路 TI 已经推荐，RF 阻抗匹配为50欧
