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发帖数: 30 | 1 The Differential Input Impedance of OPA656 (Wideband, Unity-Gain Stable, FET
-Input Operational Amplifier) is given as
10^12 Ohm || 0.7 pF. Does 10^12 Ohm mean the DC Input Impedance? How to calc
ulate the differential input impedance for
AC signal, say f=10MHz? Is the following correct?
Zin=1/(2*3.14*f*C)=1/(2*3.14*10^7*0.7*10^(-12))=20kOhm
I want to monitor a 0.1V/10MHz signal which has source impedance as high as
100MOhm by oscilloscope. Is there any chance?
Reference article:
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