Stats

Locked Locked
Replies 4
Subscribers 125
Views 73244
Members are here 0

This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Operating region

Hi there,

Ive been a bit wondering about calculator function of "operation region". Is is calculated simply by Vgs, Vth, Vds? Or Is there any other thing done for this background?

Thanks,

Andrew Beckett over 15 years ago

What calculator function? There's not a calculator function called "operator region".
Perhaps you're asking about how operating point parameter "region" (see "spectre -h bsim4", say) is computed? If so, it's sort of described in the Virtuoso Simulator Components and Device Models Reference manual <MMSIMinstDir>/doc/spectremod/spectremod.pdf
Regards,
Andrew.
Cancel
Vote Up 0 Vote Down

Cancel
jugemu1234 over 15 years ago

2 region=triode Estimated operating region. Spectre outputs number (0-4) in a
rawfile.
Possible values are off, triode, sat, subth, or breakdown.
Thats what they say in spectremod.pdf but it does not mean how each region was defined. So my question is, say, when Vgs>Vth and Vds>Vdsat, then "region" would be simply saturation? Or Is there more complicated computation?
Thanks,
Cancel
Vote Up 0 Vote Down

Cancel
Andrew Beckett over 15 years ago

Try these two solutions, one for bjt and one for bsim3v3 (I think it would have the same meaning for bsim4).
Andrew.
Cancel
Vote Up +1 Vote Down

Cancel
Dennis Faber over 15 years ago

You can map the 5 regions as follow:
0 cut-off
1 triode
2 sat
3 subth and 4 breakdown:
Condition for saturation region in zeroth approximation is:
|Vds|>=|Vgs-Vth|=|Vds,sat|
Cancel
Vote Up +1 Vote Down

Cancel

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.