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使用LMP7721做微电流跨阻放大器，输入信号电流为几pA到几nA的范围，看手册对于这种微电流放大需要对输入信号进行做Guard，那么Guard应该怎么设计？将输入信号围一圈，然后与LMP7721的NC引脚连接吗？Guard应该与输入端同电位才能起保护作用，那么如何让Guard与输入同电位？这个电路应该怎么设计？
