I was trying to create a digitally controlled gain amplifier stage using an AD5293 as the R2 resistor in a inverting amplifier topology. But it make my output full off high frequency signal.
As my snapshot from my scope show I have a 1Mhz noise on top of my signal. I can reduce it by adding a 15pF capacitor in parrallel but it will be better if I can find a solution to avoid this noise.
Does my design have a problem? Or do you have other idea to create a digitally controlled gain...