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How operating points are calculated in DC analysis?

BaaB

I have a simple circuit below. I am wondering how Spectre determine the operating region and calculate operating point VDS of each transistor in DC analysis.

Does it first determine the operating region of each transistor and then solve differential equations that relates element in circuit?

That does not seem to be right because to know the region, first we need to know VDS of each transistor. 

So how does it calculate VDS here?

Thank you.

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  • BaaB
    Thank you for the answer. I am just interested in how the simulator work in general.
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  • BaaB
    Thank you for the answer. I am just interested in how the simulator work in general.
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