We are using AD8210 for high side current sensing at bidirectional dc-dc converter. We have two problems about it. First we have used 470 pF instead of 400 pF mentioned in the document: (http://www.analog.com/static/imported-files/application_notes/120739192AN815_0.pdf) But we saw unexpected high gain. What should be the reason?
Secondly we saw harmonic on the output signal and we know it is because of switching of converter. We use the converter at 20 kHz. Can we use input filtering to get rid of these harmonics? If we can use waht should be the Cfilter? (We have used 10 ohm as Rfilter)