kumar.g
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Posts: 51
Frankfurt, Germany
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Hallo All,
I have simulated a D-latch using OFET. When running a transient simulation it gave me the following warnings.
"Matrix is singular (detected at `NQ')"
"Zero diagonal at net1 and net1" Then the simulation ended prematurely with convergence problem. Now I ran the simulation using a cmin of 1fF and then the zero diagonal warning disappeared and the circuit also converged. But the first warning is still there. I am giving a pulsed input to DIN but the output of the latch (Q and NQ) doesn't change. Is this error due to cmin or the first warning? I know that cmin is used at all floating nodes to avoid convergence problem. But does cmin affect the functionality of the circuit? I have attached the model(with parameters input file) and schematic. The inputs used are as follows.
DIN - pulse (-0.2 , -14 V); CLK - pulse (-0.2, -10.2V, freq = 100Hz) ,NCL- negated CLK
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