harpoon
|
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 !
|