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请问上图中红色圈内是该接地还是和LOOP-连接？
user151383853：
这是信号输出端, 不能接地
作为差分信号处理
Kailyn Chen：
红色圈内，MOS的Emitter极应该接地，不是和LOOP- 接的。
关于ISO7221C手册上Figure 19. Isolated 4- to 20-mA Current Loop原理图疑问
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