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mmsim

  • 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
  • Cadence noise aware PLL design flow: have lock problem

    Hi All, It is a bit long story. I will try my best to explain it clear. Thanks for your patience to read it through and give me some feedback. Recently I tried to follow Cadence noise-aware PLL design flow (PLL Macro Model Wizard) to verify my design. (We got the PLL_workshop from Cadence already) I...
    Posted to RF Design (Forum) by lunren on Mon, Feb 6 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
  • 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
  • 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
  • Q&A: TI Wireless Team Describes Advanced Phase-Noise Characterization for RF Oscillators Using SpectreRF

    In this interview, members of the Texas Instrument wireless group talk about the characterization effort initiated and completed last year between Cadence and IBM using TI RF designs as a pilot. The goal between the two teams was to optimize SpectreRF usage to successfully and efficiently simulate TI...
    Posted to RF Design (Weblog) by helenet on Wed, Jun 15 2011
  • 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
  • Tips for Simulating a Transmit Mixer in SpectreRF

    Some typical questions that I receive from newer SpectreRF users are: How do I simulate a transmit mixer? How do I look at both upper and lower sidebands? How do I set up my simulation for PAC and Pnoise? When I plot my data, how do the indexes correspond with the sidebands? Hopefully the following will...
    Posted to RF Design (Weblog) by Tawna on Thu, Mar 10 2011
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