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4 Threads found on Id Versus Vds
How can one calculate the switch off resistance of a MOSFET used as an analogue switch? Simulate it within its real application environment. What kind of circuitry would one need if this switch off resistance is to be increased? Use lower width and/or length.
How to find the I-V characteristics Id versus vds? of an NMOS transistor Also.. How do I sweep the VGS and vds from 0 to 3V? I am having a bit of trouble using spice, if anyone knows a good tutorial "for dummies site" please let me know...
"I tried to derive these on my own by writing the large signal Id (saturation) equations, and keeping the constrains (vds versus Vgs-Vt) satisfied; is this the right approach?" This approach is not necessary. The easy way is just to remember, for analog design ,each MOS must be in saturation region,so you need to make (...)
Thanks for holddreams's reply. If vth is not equal to vth0, how should I set Vgs in spectre? is there any ideas?