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请教一下,需要一个产生100nA电流的恒流源电路

Other Parts Discussed in Thread: INA128, OPA2344

请问可以用哪款芯片来搭建? 有些芯片例如INA128,理论上可行,但是参考电阻需要很大,有什么解决方法吗?谢谢!