Photodiode amplifier designed by wizard oscillating


I used the Photodiode Circuit Design Wizard ( to come up with the attached circuit.

The circuit simulation opamp oscillates on the output. I guess that chances are that it will do so in the real world as well.

Please could someone advise; why and what to do about it?

I attached a ZIP which includes 2 files;

1. TransientAnalysis.asc (generated by the wizard)

2. TransientAnalysis_delay.asc (modified by me; i simply delay the pulse from the photodiode by 900ns) which shows oscillation after approx. 200 ns.

If you want to check out the design in the wizard (, you can load the file included in this ZIP into the wizard:


fixed hyperlinks.
[edited by: HEK at 9:40 PM (GMT -4) on 12 Sep 2018]
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