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Re: No DC solution found (convergence) & Matrix singular
It seemed like a connectivity problem to me.
When you model bias circuits and send this current output to some other block models, these bias currents might stay floating if you do not model any resistance to ground or vdd to receive...
After sweeping VDS in DC simulation and plotting Id versus VDS and taking derivative of Ids you will get ΔIds/ΔVds which is the expression for 1/(output resistance).
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