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Missing Collector-Substrate Diode will be forward biased

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wee_liang

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Can somebody explain to me what is the meaning of the Warning provided by Spectre simulation means? I get this when I powerd down my BiCMOS analog circuit to shut off the current totally. Is it real or simulation hiccup?
 

I think, this means your Collector has negative bias more than 0.6 V relative to Substarate .
 

I am having the same problem. How do I tell the simulator what the substrate voltage is for a npn transistor?
 

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