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Integrator simulation warning about missing bulk source

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samuel

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A problem about an integrator simulation;

when i simulate an integrator ,a warning is followed that missing bulk source(a reset MOS switch ) would be forwardly biased. i do not know why?

integrator state:

1.a photodiode is connected to negative input terminal of operational amplifer.

2. a 2.5v referrence voltage is connected to positive input terminal of operational amplifer.

3.a capacitor and mos reset switch are parrally connected between negative input termial of operational amplifer and output of operational amplifer.


thank you in advance.
 

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