TI FAE你好，
我这边基于TIDA-010232：高压电动汽车充电和太阳能中的绝缘监测 AFE 参考设计遇到了问题，描述问题如下：
1）我将固态继电器开关 TPSI2140-Q1和MCU分别放在不同的PCB上，之间的连线有20cm长
TPSI2140-Q1处的不平衡电桥原理图参考贵司的参考设计
实际上R16并未焊接，而是留到AMC3300器件输入端口进行分压
AMC3300在另一块PCB上，和MCU一起：
请不要介意，此处差动放大电路放大倍数实际为1。
拓扑结构如下所示：
当我控制MCU，令ISO_RELAY_SWITCH_1和ISO_RELAY_SWITCH_2为高电平5V时，那么两个TPSI2140-Q1都应该导通，测量VIN_AMC和PE之间电压如下图所示
当TPSI2140-Q1侧HV高压母线不上电时：
当TPSI2140-Q1侧HV高压母线上电为30V时：
当控制两个TPSI2140都关闭时：
请问这是为什么会产生如此大的噪声？已知5V电源如通道1所示：
您好
What kind of probe are they using (single-ended vs differential)? Would recommend differential here, wonder if a single-ended probe would short the chassis ground (GND) to HV- and cause the measurement ripple. Maybe if the oscilloscope power minus is connected to chassis ground but the single-ended probe minus is connected to HV-.
I think we can definitely check whether the TPSI2140-Q1 is causing this (I don't think it is) is by removing the top and bottom TPSI2140-Q1s and checking whether the measurement ripple still exists.
For simulating the TPSI2140-Q1, we can model S1 to S2 as follows:
