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mmsim,Virtuoso Spectre Simulator GXL

  • Simulating Crystal Oscillators is Much Easier in MMSIM12.1 - Part 2

    Greetings, Simulating crystal oscillators got a lot easier in MMSIM12.1... We have made enhancements to both Harmonic Balance and transient analyses. In Part 1 , I discussed Improvements to the Harmonic Balance use model. With the new streamlined Choosing Analyses form, you now can focus on getting your...
    Posted to RF Design (Weblog) by Tawna on Thu, Dec 20 2012
  • MMSIM 12.1 SpectreRF -- Preview of Coming nport Attractions! Part 2

    Greetings, MMSIM 12.1 contains many new features to aid RF designers. Many of these changes are described in my Part 1 blog post. I've saved my favorite for last....here's a preview of the changes to the nport component in MMSIM12.1. 1. The Edit Object Properties/Add Instance form has been revised...
    Posted to RF Design (Weblog) by Tawna on Mon, Nov 19 2012
  • Modeling Oscillators with Arbitrary Phase Noise Profiles

    When you need to include noisy oscillators in SpectreRF transceiver simulations, you have at least 3 options: 1) Semi-autonomous simulation is the most accurate approach, recommended whenever the transistor-level model of the oscillator is available. 2) rfLib/osc model is less accurate but it’s...
    Posted to RF Design (Weblog) by Tawna on Thu, May 24 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
  • SpectreRF AppNotes and Tutorials....Still One of our Best Kept Secrets!

    Some of you may remember the blog written several years ago " Shhhhh...SpectreRF Tutorials and AppNotes - One of Our Best Kept Secrets ". Well, the more things change...the more things stay the same! The location of these tutorials and appNotes still seems to be one of our best kept secrets...
    Posted to RF Design (Weblog) by Tawna on Mon, Jan 16 2012
  • Guidelines for Maximizing Speed vs Accuracy for Harmonic Balance - Part 2

    I am often asked for guidelines on maximizing speed vs. accuracy for SpectreRF harmonic balance simulations . Today, I'll discuss part 2 of the 3 part series consisting of: Which Engine: Spectre or APS? Oversample vs Number of Harmonics Harmonic Trimming The first post in this series focused on the...
    Posted to RF Design (Weblog) by Tawna on Tue, Nov 1 2011
  • Using The Composite Triple Beat Source to Speed up QPSS Analysis

    Say you have a design with 4 input frequencies: 3164M (vco), 1449M (tone0), 1456M (tone1), 1442M (tone2). Currently when you do a qpss analysis, you are inserting a total of 4 separate ports in your schematic and running a simulation. There is a divide by 2 in your circuit, so one of the frequencies...
    Posted to RF Design (Weblog) by Tawna on Thu, Jan 14 2010
  • NPORT S-Parameter Model Enhancements

    In MMSIM 7.2, two new parameters have been added to the Spectre nport primitive: datatrunc and causality . In MMSIM 7.1, passivity checking was added. The nport now has causality correction, passivity checking and enforcement, and the ability to remove small couplings terms from the input s-parameter...
    Posted to RF Design (Weblog) by Tawna on Wed, Dec 30 2009
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