Stats

  • Locked Locked
  • Replies 2
  • Subscribers 125
  • Views 3222
  • 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

Evaluate an expression once per Corner - ADE Explorer

Conorp

I'm trying to measure the output resistance of my analog block. I vary the output bias voltage a small amount and record the current for each value of the bias. I then calculate the output resistance as the inverse of the resulting current-voltage plot.

I would like to then vary the length of the transistors in my block and for each length, find the output resistance. So I currently have a corner set up that varies the length and bias voltage. However, the expression for calculating the output resistance attempts to evaluate at every point in the corner when I really need to evaluate over sections of constant length in the corner. 

I can evaluate my expression using the EvalType=Sweep for a single length and this works correctly. However, if I include multiple corners, each with a different length, then the EvalType=Sweep attempts to evaluate the output resistance over all lengths, which is not correct at all. 

So I'm wondering if it's possible to do this in the ADE Explorer Maestro view?

  • Andrew Beckett

    You'd have to set up the bias variation as a sweep and the length variation as something that is varied over corners. If you have two different corner variables, then you can't really do a calculation across just one of them (you can effectively do this with the ADE Maestro Matlab integration because that can slice across any dimension you like, but even then it would need some thought as to how best to represent the results).

    Might be best to talk to customer support.

    Regards,

    Andrew

  • Conorp
    in reply to Andrew Beckett

    Thanks Andrew! One way around this that I found is to choose a design variable to sweep inside the DC analysis. Then vary the length over corners like you say. This way the expression is evaluated at the end of each DC analysis as opposed to being evaluated on each individual point.

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.