Offset nulling isn't really a thing with CFB amps, at least as far as I understand it. Their inputs are (intentionally) very different.
Current feedback operational amplifier with offset null are not common, but they do or did exist, for example:
https://www.analog.com/en/products/lt1217.htmlhttps://www.analog.com/en/products/lt1223.htmlhttps://www.analog.com/en/products/lt1227.htmlThanks for the valuable insights. Maybe it works fine, but at least that NewAE diff probe needs very specific positive and negative power supply in low-side configuration. To me it's very inconvenient, I would like to have only 5V and 3.3V power rails on the board. I thought it's limitation of diff amps, but maybe it's just the property of the probe. Am I understand it wrong?
Current feedback operational amplifiers require positive and negative supplies because of how they are constructed with diamond buffer elements. This is why they did not become available until complementary bipolar processes, fast NPNs and fast PNPs, became available.
There are fast single supply operational amplifiers, but I think they are all voltage feedback. They could be used, but current feedback parts have advantages at high speeds.
Any fast current feedback amplifier will do the job. I would look for one with high gain, low noise, and offset null capability but the later is not common.
Pretty please, can you give me some example of such amp?
The only single supply part that I know of which can give enough gain at 100 MHz might be the
LTC6268-10, but I have never used it so maybe someone else can comment.
Keep in mind that in order to be useful, the amplifier has to have enough gain-bandwidth product to provide useful gain at 100 MHz, so that means a GBP of many times 100 MHz, in this case 40 times.