Stats

  • Locked Locked
  • Replies 9
  • Subscribers 127
  • Views 18194
  • 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

Why gm is not zero even when iDS is a constant DC current?

BaaB

I am trying to plot transconductance gm of M0 in the picture below. However, what I am supprised here is why gm is not zero when iDS is a constant DC current (1uA).

gm = diDS/dvGS

So according to this, gm should be zero when iDS is a constant.

As seen from the picture below, gm is not zero.

Could anyone explain why and how gm is calculated by the simulator?

Thank you.

Parents
  • Andrew Beckett

    No, I will not have the time to sit and wade through Berkeley's BSIM code to answer this. Unfortunately I have enough real-world design/tool problems to worry about and can't allocate time to look at this. Please contact the Berkeley BSIM group (particularly since you're from a University) if you want more information about the specifics of their model implementation.

    Sorry if that's a bit blunt, but given my limited bandwidth (especially this month), I've already gone beyond what help I can afford to offer on this.

    Kindest Regards,

    Andrew.

Reply
  • Andrew Beckett

    No, I will not have the time to sit and wade through Berkeley's BSIM code to answer this. Unfortunately I have enough real-world design/tool problems to worry about and can't allocate time to look at this. Please contact the Berkeley BSIM group (particularly since you're from a University) if you want more information about the specifics of their model implementation.

    Sorry if that's a bit blunt, but given my limited bandwidth (especially this month), I've already gone beyond what help I can afford to offer on this.

    Kindest Regards,

    Andrew.

Children
No Data

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.