Hi,
I am experimenting with an op-amp peak detector used to sample and hold the peak voltage from the output of a voltage divider circuit. This is part of my attempt to rebuild the AMP+ circuit in
this electric fence monitoring project.
I have measured my input pulse using an oscilloscope to be a few microseconds with a peak at 0.7 volts.
I have tried a couple different op-amps. I used the
TLV9062 (what my reference circuit uses), and found that the reported peak voltage is
higher than the input voltage: the alleged peak is 1.5 volts. I also tried using an
OPA2374 and measured a peak of about 0.6 volts.
The OPA2374 had an output that was much closer to what I would expect. What should I be looking for in the op-amp datasheets to distinguish between these op-amps and predict this output behavior?
I have watched through this video on peak detector circuits but didn't get any hints as to what my issue might be.