Hi

is it reliable to design analog circuits  with Low Vt  MOS for new tech  like 65nm or 90nm
i mean also " are the models reliable ?"
any paper or links are highly welcomed

Thanks

I believe you can, if your primary concern is low power instead of speed. But i will encourage you to do more research on this since from your question, you are relatively new in this area!

I can only say that it depends on foundries.

Generally, a lot of the foundry effort goes into getting the nominal devices to work ... and for an analogue kit, the effort is for getting the modelling right for "normal" operation of nominal devices.

A good indicator is to check how many "msmt vs sim" plots you get for those devices compared to a nominal device.

Also process control is tighter for the nominal Vt devices as that is the main device in any foundry offering (i think ?).

You will probably see a hit in yield if designing using low-vt + subthreshold for "critical" cells.

having said all that, do go for it ! Design is all about pushing the boundaries ... as long as you understand the risk you are taking !

good luck !