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I have a current design of a circuit which works well, but I am needing to make a few extensions to it. I am working on a 4 channel oscilloscope. Each channel must be able to take various ranges of input and properly scale it to 0 - 3.3 V for a ADC to process with the best accuracy.

AC signals will be between 0 - 100 kHz with the setup for the following input ranges:

+/- 10V range +/- 5V Range +/- 1V Range +/- 0.5V Range

I already have a working differential op amp circuit design for +/-10V (ATTACHED BELOW) but I need to be able to scale the remaining ranges as well using a programmable gain amplifier instead of multiple resistors and mux combinations on my differential amplifier.

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Any advice would be greatly appreciated!

Beshoy Hanna
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    Have you used Google to search for "oscilloscope front end" and then pressed the Images tab? Plenty of schematics show up. – Bimpelrekkie Feb 20 '20 at 14:35
  • https://electronics.stackexchange.com/questions/480923/differential-input-circuit-design-frequency-issue is this resolved now? – Andy aka Feb 20 '20 at 14:43

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