Stats

  • Locked Locked
  • Replies 3
  • Subscribers 126
  • Views 5213
  • 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

Is isnoisy valid in XPS MS simulation?

zuiying

Hello! I am using isnoisy parameter in tran noise simulation. The setting is as follows.

When I use spectre or APS, the isnoisy is valid.

But when I use XPS MS simulation, the isnoisy seems invalid.

 

Here is my virtuoso version. Is this normal？Thank you！

Parents

  • What's more important is the Spectre version being used (this will be at the top of the Spectre log file). I just tried this (from a netlist):

    //

    V1 (in 0) vsource type=pulse val0=0 val1=1 rise=1n period=20n width=10n
    R1 (in mid) resistor r=1k
    C1 (mid 0) capacitor c=0.5p
    R2 (mid out) resistor r=1k
    C2 (out 0) capacitor c=0.5p
    R3 (in out2) resistor r=5k
    R4 (out2 0) resistor r=5k

    tran tran stop=1u noisefmax=1G noisescale=100 param=isnoisy \
    param_vec=[0 0 400n 1 800n 0]

    This clearly shows that both out2 and out have noise only within the time 400n to 800n when run with "spectre +ms". I'm running this with a Spectre 21.1 hotfix version, but I can experiment with other versions once I know what you're using. Maybe it was broken or not implemented (I didn't find it from a search, but maybe you're using a very old Spectre version?)

    Andrew

  • in reply to Andrew Beckett

    Cadence (R) Virtuoso (R) Spectre (R) Circuit Simulator
    Version 15.1.0.284.isr1 64bit -- 12 Nov 2015
    Copyright (C) 1989-2015 Cadence Design Systems, Inc. All rights reserved worldwide. Cadence, Virtuoso and Spectre are registered trademarks of Cadence Design Systems, Inc. All others are the property of their respective holders.

    Is this the information you need?

Reply
  • in reply to Andrew Beckett

    Cadence (R) Virtuoso (R) Spectre (R) Circuit Simulator
    Version 15.1.0.284.isr1 64bit -- 12 Nov 2015
    Copyright (C) 1989-2015 Cadence Design Systems, Inc. All rights reserved worldwide. Cadence, Virtuoso and Spectre are registered trademarks of Cadence Design Systems, Inc. All others are the property of their respective holders.

    Is this the information you need?

Children
  • in reply to zuiying

    As I suspected, you're using a very old version of the simulator - as you can see, it's from 8 years ago (well, 8 years ago in a few days). 

    I did some tests, and sure enough it doesn't work in MMSIM15.1 ISR1. It does however start working from MMSIM15.1 ISR8 (from July 2016). So the answer will be not to use such an old version - there's not really any good reason to be using such an old version (there have been 8 major releases of Spectre since then - releases afterwards were called SPECTRE rather than MMSIM, with the current being SPECTRE23.1).

    Andrew

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.