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电流反馈运放THS3201的负载电阻RL与隔离电阻Riso的概念分不清

Other Parts Discussed in Thread: THS3201

这是电流反馈运放THS3201的datasheet上关于同相配置的电路,我有几个问题:

1.数据手册上说,这个49.9的电阻叫做Shunt Resistor,我查了一下,中文叫做分流电阻,为什么叫它分流电阻,我怎么没看出它的分流作用呢!

2.这个49.9的电阻有没有隔离电阻的作用?