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Transistor Finger/Multiplier does not work

EricHsu

 Hello,

There is a Post about this by someone else previously. But it doesn't solve my problem. The same thing happens that I created a nmos/pmos in schematic composer and run a test to see whether multiplier works. When I change the W/L it works well, but when I change multiplier it just doesn't work.

I have checked the CDF, it shows that the inst Parameters for Spectre is (l w m ad as pd ps nrd nrs). I believe this m is multiplier. And then I check the models for Spectre. It include the subckt nch_mis. The mapping is like this:

********************************************************************************************** 

nch_mis(d g s b) nchmis w=w l=l ad=ad as=as pd=pd ps=ps nrd=nrd nrs=nrs m=multi

********************************************************************************************** 

I'm using IC 5.10.41. Do you know why my transistor multiplier does not work? 

  • Not really, because you didn't provide enough information.

    You didn't say what you mean by "doesn't work". Probably would need to see the entire CDF to understand how it is set up, plus an example of what you're getting in the netlist. It looks as if the model is expecting a parameter called "multi" to be set on the instance - but given that you just included one line from your model files (presumably this line was within a subckt (or inline subckt) model, which had parameters defined), it's very hard to tell.

    If you can't share this information in an open forum, please contact customer support.

    Kind Regards,

    Andrew.

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