This is because you have used mismatch in your models. For mismatch to work, you need to be varying a parameter within a subckt (see Recommended Spectre Monte Carlo modeling methodology ). If you'd used process in the statistics block, it would have worked. If you genuinely need mismatch variation (which seems slightly odd for a single voltage source), you'd need to place the vdc within a sub-block. Create a simple schematic just containing the vdc (as you have it), create a symbol for it, and then place that in your test bench and proceed as you have right now. You'll then see the variation. Regards, Andrew
↧
