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MMSIM,Virtuoso Spectre,RF design

  • 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
  • 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
  • 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
  • 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
  • New Time-Saving Feature in IC6.1.4 ISR2: Plot S-Parameter Data Directly From ViVA!

    If you haven't heard about it....there is a new feature in IC6.1.4 ISR2 which makes troubleshooting circuits containing nports ( s-parameters ) much easier and faster! Starting i n IC6.1.4 ISR2, you can now plot s-parameters directly in ViVA (without having to create a test bench and run a Spectre...
    Posted to RF Design (Weblog) by Tawna on Thu, May 20 2010
  • 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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