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如何计算OPA140输入阻抗?

Other Parts Discussed in Thread: OPA140

我用OPA140搭建了一个仪表放大器,由于我的源阻抗是一个变化值,大致范围在nx100-nx100K变化,信号频率在0.1Hz-100kHz变化,我想算出这个仪表放大电路输入阻抗够不够大,麻烦懂的人帮我给出一个随信号频率变化仪表放大电路输入阻抗函数。

OPA140的输入阻抗值: