How to simulate Dynamic Circuit RIGHTLY?

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020170

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Digital circuit block can be sort out "Static" and "Dynamic."

When I simulated Dynamic circuit in Hspice, single circuit is okay.

But, in complex blocks, dynamic circuit is not working.

No. I am wrong. I don't know dynamic circuit is working or not.

Because Hspice is even not working!

always, Hspice show me "DC operating point error" or "Iteration limited error"

Is there any solution to simulate dynamic circuits in complex block?

thanks
 

set initial conditions to the floating nodes.
 

or put a large resistor at the floating nodes
 

r put a large resistor at the floating nodes
 

If I don't know where is floating node?

How to find Floating node in my circuit?

Or I can't set large resistor value due to a number of Floating nodes

How can I solve this problem?
 

You should know where the floating node is when you design dynamic circuit. But you are still not interested in the floating nodes, try the option, gshunt=1e-9 or smaller value.
 

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