Hi,
I am not sure if a MOS can have negative mos caps, but surely it can have negative Ids.
what is the type of MOS? what are u trying to simulate?
please provide more details.
I just simulate a 45nm MOS device for Ids and caps.
I planed to use table-based data to model the intrinsic caps of a transistor, but after Spectre simulation, I found all the caps have negative values.
I read some papers about table-based MOS models, almost all of them use charge tables for modeling.
I just feel confused why not directly using cap table model?
For 45nm technology and below, the caps are derived from charge. Since the charge expressions are really complicated so I want to get the cap value directly.
I read some papers about table-based transistor model, but all of them use charge tables. I can't understand why not using cap tables 'cause Q=CV.
is there any way to simulation terminal charge by using spectre or spice?