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harmonic balance,RF design,spectreRF

  • Issue with Envelope analysis

    Hi, I am simulating the I/Q upconversion using port through envelope analysis. The I input pwl file has samples of a cosine of frequency=5MHz and timestep=0.00125us. The Q input pwl file has samples of value=0 and timestep=0.00125us. The original I, Q pwl files have data upto 2ms. I have attached the...
    Posted to RF Design (Forum) by AparnaG on Sat, Mar 8 2014
  • Re: VCO: PSS and pnoise analysis and Numerical Errors

    Hi Sivaramakrishna, If this is a strongly nonlinear circuit (e.g. ring oscillator), then pss-shooting is appropriate. Otherwise, I would use hb (harmonic balance). Please check out your setup - very important to get correct results. In my blog: SpectreRF Tutorials and Appnotes... Shhhh... We Have a NEW...
    Posted to RF Design (Forum) by Tawna on Wed, Jan 22 2014
  • SpectreRF Tutorials and Appnotes... Shhhh... We Have a NEW Best Kept Secret!

    It's been a while since you've heard from me...it has been a busy year for sure. One of the reasons I've been so quiet is that I was part of a team working diligently on our latest best kept secret: The MMSIM 12.1.1/MMSIM 13.1 Documentation has been completely revised. It is a great source...
    Posted to RF Design (Weblog) by Tawna on Tue, Dec 17 2013
  • SpectreRF at 2013 IEEE/MTT-S International Microwave Symposium in Seattle, Washington

    If you are attending the International Microwave Symposium ( IMS 2013 ) in Seattle (June 2-7, 2013) stop by the Cadence Design Systems booth, #427. We will be showing new MMSIM12.1.1 features including “Smart” HB GUI, Robust and easy to use nport (for s-parameter input), and the Transmission...
    Posted to RF Design (Weblog) by Tawna on Thu, May 23 2013
  • Simulating Crystal Oscillators is Much Easier in MMSIM12.1 - Part 1

    Greetings! Simulating Crystal Oscillators got a lot easier in MMSIM12.1... We have made enhancments to both Harmonic Balance and Transient analyses. In Part 1, I’ll cover Improvements to the Harmonic Balance use model. With a streamlined Choosing Analyses form you can now focus on the simulation...
    Posted to RF Design (Weblog) by Tawna on Wed, Dec 19 2012
  • MMSIM12.1 SpectreRF Preview of Coming Attractions! - Part 1

    Greetings! MMSIM 12.1 contains many new features to aid RF designers. Here's a preview of the changes... Documentation Improvements The SpectreRF User Guide is being completely rewritten and updated for MMSIM12.1. Check it out - I'm sure you'll really like it! Harmonic Balance Improvements...
    Posted to RF Design (Weblog) by Tawna on Mon, Nov 12 2012
  • Re: What is the use of No of harmonics option in PSS form

    Hi yxue, In harmonic balance, the number of harmonics chosen does affect accuracy. There is a blog and a solution on this: Here is the Blog: Guidelines for Maximizing Speed vs Accuracy for Harmonic Balance - Part 2. http://www.cadence.com/Community/blogs/rf/archive/2011/11/01/guidelines-for-maximizing...
    Posted to RF Design (Forum) by Tawna on Tue, Oct 2 2012
  • Measuring 2-Tone Intermodulation Using Envelope-Following Analysis

    From time to time, SpectreRF users simulate very large, extracted-view circuits in 2+ tone QPSS. In many of those cases, memory requirements exceed the available resources. When that happens and small-signal approximations aren’t applicable, the user is typically stuck. The solution below and attached...
    Posted to RF Design (Weblog) by Tawna on Wed, May 16 2012
  • Guidelines for Maximizing Speed vs. Accuracy in SpectreRF simulations - Part 3

    Several months ago, I started a 3 part series on Guidelines for Maximizing Speed vs Accuracy for Harmonic Balance simulations. Today, I'll discuss part 3 of the 3 part series consisting of: Which Engine: Spectre or APS? Oversample vs Number of Harmonics Harmonic Trimming The first and second posts...
    Posted to RF Design (Weblog) by Tawna on Wed, Mar 7 2012
  • Nport Application Note has been Updated and Re-Released

    Happy New Year! After many requests, I set aside some time and updated the Using the nport in Spectre and SpectreRF Simulations appNote for MMSIM 11.1. You may download the appNote on Cadence Online Support . More nport enhancements are planned, so stay tuned! If you have any comments or questions, please...
    Posted to RF Design (Weblog) by Tawna on Tue, Jan 3 2012
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