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Oct24-11, 12:50 PM
P: 324
Totally agree with cmb, start with a divider. Depending on the probe, buffer the divided node with a follower.

Only if it doesn't work go to the more complicated integrators.

My only caution is 100M/1M is pretty big and even if there is only a few 10s of pF on the follower node (due to the opamp or probe) the measured signal will be low passed into KHz. As ~100KHz values are desired you might want to try lower value resistors.