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Voltage follower with opamp can be adequate active probe for this circuit. If you want, you can build the probe with high speed opamp, and low bias current (CMOS) for future use, but this circuit doesn’t need it.

I have been using 100M-1Gohm resistors in transimpedance amplifiers, 22MOhm doesn't look like an "elephant in the room"

[QUOTE="kd502, post: 1790994, member: 484957"] Voltage follower with opamp can be adequate active probe for this circuit. If you want, you can build the probe with high speed opamp, and low bias current (CMOS) for future use, but this circuit doesn’t need it. I have been using 100M-1Gohm resistors in transimpedance amplifiers, 22MOhm doesn't look like an "elephant in the room" [/QUOTE]

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