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Help with AD648 Opamp with very low input signal change

I am using this opamp for a Phtotodiode amplifier

a vering simple current to voltage circuit


Photodiode anode connected to Inverting input

Photodiode cathode connected to ground

No inverting input connected to ground

Opamp Power supply +/-15V

A 10Meg resistor between output and inverting input

My question:

If the change in current of the photodiode is so small (Ibias current level), is it possible that the opamp will not responde? (like a dead zone?)

Thank you

Fausto Bartra

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