Modeling and simulation of FinFET in cadence

Chen,

As I pointed out in one of those posts, there is no standard finfet symbol in analogLib. There certainly wouldn't be in a 0.18u generic PDK, since FinFETs are typically only used in technologies around 20nm or smaller (so a factor of 9 or more smaller, so that's quite  a few years in Moore's Law terms!).

So you'd have to create one. You could 

Spectre itself supports "bsimcmg" built-in. If in a UNIX shell, you run "spectre -h bsimcmg" you'll see the info about this. Typing "spectre -W" will show you the subversion you have available. The bsimcmg model was added in MMSIM72, and since then newer versions in MMSIM101, MMSIM111, MMSIM121 and MMSIM131 (so it's in the last 5 major releases). I see no reason to use the VerilogA model.

You'd have to create a model file using relevant model parameters for bsimcmg. So for example:

model nfinfet bsimcmg type=n l=20n d=40n tfin=15n

(probably many more - you may be able to get some idea from the test files - I didn't look).

You could copy an nmos4 component from analogLib to your own library, and change the B terminal on the symbol to be "E", and then copy the symbol to the spectre view.

Then use Tools->CDF->Edit CDF, set the CDF type to Base, and then pick your new component. You'll need to add some relevant instance parameters in the CDF - many of those for nmos4 won't be relevant. You can see available parameters from the instance parameters section of "spectre -h bsimcmg". You may not want to bother with all of them, because that's a pain and many are probably irrelevant for your needs. Then in the CDF simulation information you'll have to get the termOrder right to reflect the "E" pin rather than a "B" pin, and also make sure you list all the instance parameters you want to netlist.

You may also want to set the model paramater name to whatever you called the model name in the model statement (shown above).

Then you'd need to include the model file in ADE via Setup->Model Libraries in ADE (ideally give the file a ".scs" suffix if it is in spectre syntax).

Something like that...

Regards,

Andrew.

Chen,

As I pointed out in one of those posts, there is no standard finfet symbol in analogLib. There certainly wouldn't be in a 0.18u generic PDK, since FinFETs are typically only used in technologies around 20nm or smaller (so a factor of 9 or more smaller, so that's quite  a few years in Moore's Law terms!).

So you'd have to create one. You could 

Spectre itself supports "bsimcmg" built-in. If in a UNIX shell, you run "spectre -h bsimcmg" you'll see the info about this. Typing "spectre -W" will show you the subversion you have available. The bsimcmg model was added in MMSIM72, and since then newer versions in MMSIM101, MMSIM111, MMSIM121 and MMSIM131 (so it's in the last 5 major releases). I see no reason to use the VerilogA model.

You'd have to create a model file using relevant model parameters for bsimcmg. So for example:

model nfinfet bsimcmg type=n l=20n d=40n tfin=15n

(probably many more - you may be able to get some idea from the test files - I didn't look).

You could copy an nmos4 component from analogLib to your own library, and change the B terminal on the symbol to be "E", and then copy the symbol to the spectre view.

Then use Tools->CDF->Edit CDF, set the CDF type to Base, and then pick your new component. You'll need to add some relevant instance parameters in the CDF - many of those for nmos4 won't be relevant. You can see available parameters from the instance parameters section of "spectre -h bsimcmg". You may not want to bother with all of them, because that's a pain and many are probably irrelevant for your needs. Then in the CDF simulation information you'll have to get the termOrder right to reflect the "E" pin rather than a "B" pin, and also make sure you list all the instance parameters you want to netlist.

You may also want to set the model paramater name to whatever you called the model name in the model statement (shown above).

Then you'd need to include the model file in ADE via Setup->Model Libraries in ADE (ideally give the file a ".scs" suffix if it is in spectre syntax).

Something like that...

Regards,

Andrew.