Stats

  • Locked Locked
  • Replies 4
  • Subscribers 126
  • Views 18004
  • 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

What is the difference between id and ids of a MOS operating parameter

RFStuff

Dear All,

Can anybody please tell me what is the difference between id and Ids of a MOS operating parameter shown in operating point list of ADE.

Kind Regards.

Parents

  • This will depend on which device model is being used, but if you look in the Spectre Circuit Simulator Components and Device Models Reference manual you should find some information. For bsim4 (if that's what you have here), then in the Component Parameters section at the end of the chapter, it has a description and links to relevant equations:

    5 ids (A) Resistive drain-to-source current. Refer to equations 21-16 and 21-43.

    49 id (A) Resistive drain current. The sum of the currents though D and DI node.

    The second is a bit misleading, but if you look at the equivalent circuit early in the chapter, I'm sure id is the total resistive drain current (including that which flows to the bulk) and ids is just that between drain and source. That would seem logical given the names too.

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    Dear RFStuff,

    Andrew’s explanation is exactly correct. ID is the total drain current, including that to the bulk, and IDS is only the portion that flows from drain to source.

    Shawn

Reply 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.