Hi all, I've using a voltage reference->Resistor-> opamp feedback to make a current source. Like figure 10 here.
Now someone wants to use it where noise might be more of an issue, so I figured the first thing was to measure the noise.
Well, the dang thing is singing at ~1.8 MHz. Not that loud... about 100 uV p-p, but still this seems like bad form. Any thoughts on how I might squash this?
TIA George H. (Then maybe I'll ask about how to filter the noise further.. I was thinking about a cap. multiplier hanging on the output)