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小电流宽范围测量芯片选型

Other Parts Discussed in Thread: LMP7721, LMP7715

请问有没有芯片精密的芯片可以用于测量微小电流,100fA~100PA,3个数量级的电流范围。

例如精密运放LMP7721,采样跨阻电路的是可以测量到微小电流,请问该如何设计,才能实现跨3个数量级的电流范围呢?

桥式电路或者其他电路?谢谢。