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求推荐高输入阻抗低噪声的仪器仪表运放

Other Parts Discussed in Thread: INA110

我想测一个样品两端的电压信号,但是样品本身电阻达到1G欧姆以上,因此需要一对高输入阻抗的运算放大器构成差分电路来做缓冲。

我发现CA3140的输入阻抗可以达到1TΩ,但是其noise voltage很大。

所以希望推荐高阻抗低噪音的运放,或者间接电流反馈架构的高阻抗仪表放大器。

谢谢!