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RF design,Spectre RF

  • Spectre RF By Any Other Name ...

    It has been a while since I last appende d , hope you are well! It was a little bit difficult to come up with a subject to write about and then recently I was in a meeting where we were talking about transient noise analysis. A designer was discussing the issue of analyzing the noise of a Pipeline ADC...
    Posted to RF Design (Weblog) by Art3 on Wed, Apr 22 2009
  • Setting Up Harmonic Balance - Part 1

    This is the first of a series of Blogs to talk about how to fill out the forms for Harmonic Balance. I will include our suggested settings and some helpful hints. I will add to these over time as new things come up both from us and our customer base. Harmonic Balance works in the frequency domain and...
    Posted to RF Design (Weblog) by dondnile on Wed, Mar 18 2009
  • SpectreRF Turbo: Parasitic Reduction

    I wanted to share some experiences I had with SpectreRF-Turbo and Parasitic reduction on a recent large benchmark. The things I learned may be helpful to anyone who wants to get the most out of turbo and parasitic reduction. Available in MMSIM7.0.1 and later for RF, turbo accelerates simulation in three...
    Posted to RF Design (Weblog) by dondnile on Mon, Feb 2 2009
  • SpectreRF GUI Support for MMSIM 7.1

    MMSIM 7.1 has just been released! The following IC release GUIs support the new MMSIM7.1 features: IC5.1.41.500.5.129 (However, USR6 or later is strongly recommended) IC6.1.1 ISR65 IC6.1.3 ISR5 And later subversions. For more information, similar tips, and design topics, please visit sourcelink.cadence...
    Posted to RF Design (Weblog) by Tawna on Fri, Jan 23 2009
  • MMSIM 7.1 Enhancements Benefit RF Designers!

    The 7.1 release of MMSIM is scheduled for mid-January. There are many exciting RF enhancements that will be useful for RF designers. 1. Three new RF analyses using the harmonic balance engine, have been introduced to make the Spectre RF easier to use: HB, HBAC, and HBnoise. HB analysis (hb) provides...
    Posted to RF Design (Weblog) by Tawna on Wed, Jan 14 2009
  • Tip of the Week: Guidelines for getting accurate HB QPSS/QPNoise results

    Two of the most important parameters for accuracy are: (1) maxharms (2) oversample maxharms: The accuracy of HB is greatly dependent on the number of harmonics chosen. As a general rule, you should simulate with with maxharms [5 3] and (if memory allows) re-simulate with maxharms [7 3] to see if the...
    Posted to RF Design (Weblog) by Tawna on Fri, Jan 9 2009
  • Tip of the Week: When should I use the pss/qpss Harmonic Balance vs. Shooting Newton Engine?

    Shooting Newton (shooting) and harmonic balance (HB) are complementary technologies and used for circuits that exhibit different behaviors. The shooting Newton algorithm uses an adaptive time step control, which is particularly effective for sharp transitions. Convergence is robust and not as sensitive...
    Posted to RF Design (Weblog) by Tawna on Wed, Sep 3 2008
  • Tip of the Week: Guidelines for simulating oscillators - phase noise simulations

    When simulating oscillators, it is important to choose the correct simulator engine (shooting Newton vs. harmonic balance.) In general, we suggest that you use the HB (harmonic balance) engine as your first choice. In addition, there are situations where you may need to use the augmented=yes pnoise option...
    Posted to RF Design (Weblog) by Tawna on Tue, Aug 26 2008
  • Tip of the Week: New nport parameter ( dcextrap ) for modeling longer transmission lines

    There is a new nport parameter, dcextrap, available in MMSIM 6.2.1. The values are constant or unwrap. The default is constant. dcextrap is typically used when the nport s-parameter data file models a system with long delay – and -- the DC point is not included in the s-parameter data file. One...
    Posted to RF Design (Weblog) by Tawna on Mon, Aug 18 2008
  • Tip Of the Week: analogLib mtline now has a cross sectional viewer when Type of Input=Field Solver

    Many users have indicated that it is challenging to correctly enter complex transmission lines (multiple conductors, conductors at different heights, and multiple dielectrics) into the analogLib mtline when using the Field Solver Type of Input. You wanted to see a cross-sectional view of your transmission...
    Posted to RF Design (Weblog) by Tawna on Mon, Aug 4 2008
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