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OPA4191: 单极性恒流源能用模拟开关切换成双极性吗？

zh yihua
Prodigy 240 points
Part Number: OPA4191

基础不牢前来求教：

请教如图，想用单极性电源+12V实现双向恒流源，负载是电阻，用模拟开关这样切换可以吗？

示波器正负极测电阻两端只能得到单极性的波形，示波器测电阻一端和板子上的地得到的是+12V和脉冲？为什么会这样？

模拟开关的切换的地和电路里的其他地不一样吗？

怎么知道实际流过电阻的电流呢？

谢谢