AnsweredAssumed Answered

Why does the AD797 stay saturate (overload recovery takes infinite time) ?

Question asked by ARC on Mar 12, 2016
Latest reply on Mar 17, 2016 by ARC

Dear all,


I am using an AD797B as transimpedence amplifier (in photovoltaic mode). I have
a problem, when the gain is high and a lot of light come to the detector, the
AD797B has its output saturated to the lower rail which is normal. The problem
is that the output stay saturated even if I remove the light source. I have to
switch to a much lower gain (I use relays to choose the gain) to make the amplifier working again.

Do you know why I have this problem? It does not happen with an amplifier such
as AD8065 for exemple. Do you have a solution to avoid this issue?

Best regards,