diff --git a/Hardware/Theory/PCB_差分布线.md b/Hardware/Theory/PCB_差分布线.md
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+# PCB 差分布线
+
+TODO:
+
+## 1. 为什么要差分布线
+
+## 2. 差分线对的基本构型
+
+![多种多样的差分布线对](./img/PCB_差分布线/001.png)
+
+## 3. 差分线的主要参数和技术指标
+
+### 3.1. 板
+
+## 4. 阻抗计算工具及使用
+
+## 外部参考资料
+
+1. [PCB上形式多种多样的差分线对，平衡+等长的原则是一样的](https://www.bilibili.com/video/BV19z4y1J7gH/?spm_id_from=333.788&vd_source=39828f775e4351350ea464b48d3a004b)
+2. [差分线设计要点](https://www.bilibili.com/video/BV1o14y1d77N/?spm_id_from=333.788.recommend_more_video.2&vd_source=39828f775e4351350ea464b48d3a004b)
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