For all the parameters of the NMOS/PMOS ( Vth / Vds_sat / ... that kind of stuff ), is there some ta...
t
For all the parameters of the NMOS/PMOS ( Vth / Vds_sat / ... that kind of stuff ), is there some table somewhere with typical values ? Because sure, I can simulate using the models (and I do) but in most text book there are formulas to "estimate" the W/L or estimate some other operating values during the design stage so I don't just enter values blindly. Or do I need to extract them from the models somehow ?
e
In general one would find the textbook parameters for a device via simulation. Here are example decks: https://pages.hmc.edu/harris/cmosvlsi/4e/code/char.tar.gz
t
I see. And nobody happens to have already done it for sky130 ? 😅
a
hi @tnt, before sky130 got around, I used models from the companion website of the book Analog Integrated Circuit Design, by Carusone & Martin (maybe there was a third author, I don't remember): https://analogicdesign.com/students/netlists-models/model-files/ There you can check out common values for a variety of nodes. Closest to Sky130 would probably be 0.18 CMOS. There's a bunch of HSpice and LTspice examples, as well. Next, Razavi gives back-of-a-napkin values you can use in hand calculations in the first chapter of his The Design of Analog CMOS IC Design (or something similar) and Allen & Hoberg do the same in their CMOS Analog Circuit Design. Finally, there is the companion website (and waaay much more than that) of the book you mention in the previous thread, by Jacob Baker - https://cmosedu.com/ <== that's probably one of the most comprehensible resources you can get online on this topic. In conclusion, my opinion is that the (completely valid, and both as a teacher and a designer, I understand where this request comes from) concept of "typical values" is quite contradictory to a particular technology (such as sky130). So, getting typical values for sky130, for hand calculations and estimates, is actually getting typical values for any submicron technology 130-350 nm. If you are looking for values that are sky130, then those I wouldn't call typical and I would definitely then simulate.
e
t
Thank you both, some nice resources there !
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