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mmsim,RFIC

  • 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
  • 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
  • Problem with nport

    I am using Cadence 6.13 with mmsim 7.2 I have a problem running simulation that include the nport component. I get the following error: ERROR (SFE-874): "input.scs" 20: Unexpected keyword "options". Expected equals. At other times, I also get the following error: *Error* fprintf/sprintf...
    Posted to RF Design (Forum) by elbadry on Wed, Mar 30 2011
  • 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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