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Using an AD5293 in feedback loop => Circuit oscilation

Question asked by Flanbix on Aug 5, 2011
Latest reply on Aug 11, 2011 by Flanbix

Hi,

 

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...

 

Thanks

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