Amplifier noise

Question

I am getting jittering noise from the output of AD8253. I dont know why. Any thoughts about this. Any help would be very much appreciated. Thank you.

kristinehoffman · Accepted Answer

Hi chandima, 
 Apologies if I missed this thread. 
 The noise graph you attached seems unclear for me to analyze. Can you attach a clearer scope shot with X/Y axis present? There are several factors that contribute to noise, and with the reference design you are using, any of the amplifiers in the first stage could be contributing to it. Even measuring equipment or probes could affect noise and sometimes maybe the culprit for the spikes we see. 
 There are several provisions and input options in the diagram you attached, can you attach the link from where you found this design? If possible, can you attach a actual block diagram on what input levels are you using or being conditioned in your system, and also supply levels of the amplifiers specifically those before AD8253? In this way we can understand better on what may cause the noise jitters that you mentioned. 
 Have you also tried simulating it first on LTSpice? In this way we will be able to modify and configure the design and see the expected output first before fabricating it on bench. 
 Regards, 
 Kristine)

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Amplifier noise