<@U01RSNFAM55>
What is the current density of MOSF...
# ieee-sscs-dc-22k
Kamta Kesharwani
08/05/2022, 7:12 AM@Boris Murmann
What is the current density of MOSFETs like nfet_01v8 and other FETs?
specifically, if i want to pass 30mA current through nfet_01v8 then howmuch width of transistor should I take? (keeping drain/gate voltage not more than 1.8V)
b
Boris Murmann
08/05/2022, 2:18 PMAre you using the MOSFET as a switch or current source?
k
Kamta Kesharwani
08/05/2022, 3:13 PM@Boris Murmann
I am using Mosfet as a switch.
Kamta Kesharwani
08/05/2022, 3:18 PMOne more question: what is the threshold voltage of nfet_01v8/pfet_01v8 and how to check threshold voltage of other FETs?
b
Boris Murmann
08/05/2022, 5:02 PMYou can run a DC operating point analysis to find the threshold voltage of a transistor.
Boris Murmann
08/05/2022, 5:03 PMFor your switch design, you need to decide on the on resistance that you want. For example, 100mV/30mA = 3.3 Ohms.
Boris Murmann
08/05/2022, 5:07 PMFrom here, I would just run a quick simulation of a device with say W = 10um, see what its on resistance is and then scale up the width accordingly. You will need to think about contact resistance and how many flingers to use, etc., but that is the second step.
k
Kamta Kesharwani
08/06/2022, 1:04 PM@Boris Murmann Thank you so much.