AnsweredAssumed Answered

AD8370 stability

Question asked by gordondobie on Oct 7, 2013
Latest reply on Dec 3, 2013 by Nikolai_Pavlov

Hi,

 

We are using an AD8370 and are having issues with stability - the amplifier tends to go into high frequency oscillation.  We have a mini circuits transformer on the input and output for matching.  It tends to work ok at low gains (in low gain mode codes of 0 - 85 are typically ok), but in high gain it is unstable for even low gain codes, such as 30.

 

We have the advised decoupling capacitors etc.  Our input is at 5 MHz fed from a transimpedance amplifier with a differential output AD8015.  We have followed the layout suggestions .

 

Can you offer any suggestions?  Are their passive components that we can add to improve stability?

 

Thanks, Gordon

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