IWR1843: 给1843供电的电源轨受到发射调制干扰问题，引起电源纹波噪声恶化。

您好，请参阅以下答复：

纹波可能是由于 LC 滤波器组合不正确造成的。 

在雷达原理图上可以做如下改进： 

• In 'IWR1843' schematic section, please use 4.7pF cap instead of 5.6pF in XTAL.
• Use 0.047uF decap for VBGAP instead of 0.22uF.
• In 'Power" schematic section, the ferrite bead between C39 and C40 is missing, also please use 4.7uF & 47uF caps instead of 22uF & 0.1uF (C39 & C40).
• 22uF caps for C43,44,45 & 0.1uF for C42 & 4.7uF cap for C41 is recommended.
• 10kOhm pull up is recommended from Warmreset to 3.3V instead of direct connection.
• Add 10uF cap in parallel to C51,52
• 47uF,10uF,10uF in parallel instead of C53
• In LC filters, caps were missing for 1.23,3.3 & 1V. 10uF,22uF cap in parallel is recommended.
• In SOP switch, SOP signals are absent. Please follow below reference if you intend to use the SOP modes.

其余的原理图部分是正确的。 上述 L、C 值是 IWR1843 EVM 参考原理图中的推荐值。