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互阻抗放大器噪声测量疑问

对于互阻抗放大器,

在测试噪声时,有一点不确定,因为看过的文章中说测试噪声时输入端要开路,The noise performance was tested when the input node was floating.

但是平常测试示波器的本地噪声时都是将探头短接,所以这里不太确定噪声测试是将输入端开路还是短路,求指教。