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  • Re: For LNA design, how to get the transistor size (BJT) for the Ropt?

    Hi Aba, If you are new to SpectreRF, the first thing I recommend you do is go through Simulating Low Noise Amplifiers section of Appendix A of the SpectreRF User Guide. You will need to have an account on Cadence Online Support ( http://support.cadence.com ) to download the gpdk180 required to simulate...
    Posted to RF Design (Forum) by Tawna on Wed, Jul 16 2014
  • Distortion Summary in New CDNLive YouTube Video and at IEEE IMS2014 Next Week!

    Hi Folks, Check out this great new video on YouTube: CDNLive SV 2014: PMC Improves Visibility and Performance with Spectre APS In this video from CDNLive Silicon Valley 2014, Jurgen Hissen, principal engineer, MSCAD, at PMC, discusses an aggressive RF design with distortion problems in the lab, and how...
    Posted to RF Design (Weblog) by Tawna on Fri, May 30 2014
  • Re: Stop Time in Transient Analysis

    Hi Hadi, > Why should we enable conservative in errpreste ? To quote one of my favorite engineers...I've never met a designer who favored a quick result over an accurate one in their final oscillator design... :-) Unless you really understand the simulator options, what each one does, and how...
    Posted to Custom IC Design (Forum) by Tawna on Wed, May 21 2014
  • How to Specify Phase Noise as an Instance Parameter in Spectre Sources (e.g. vsource, isource, Port)

    Last year, I wrote a blog post entitled Modeling Oscillators with Arbitrary Phase Noise Profiles . We now have an easier way to do this. Starting in MMSIM 13.1 , you can specify the phase noise as an instance parameter in Spectre sources, including port, vsource and isource. The use model is similar...
    Posted to RF Design (Weblog) by Tawna on Tue, May 20 2014
  • Re: Stop Time in Transient Analysis

    Hi Hadi, This may be more information than you want to know...but here it goes. :-) When simulating an oscillator in transient analysis, you need to make sure you've started the oscillator (otherwise, you will see a straight line when you simulate). When simulating oscillators, you should set errpreset...
    Posted to Custom IC Design (Forum) by Tawna on Tue, May 20 2014
  • Impedance measurement

    Sir/Madam, I have been designing a Differential drive rectiifer for UHF passive RFID in 130nm CMOS process. As the design of rectifier completes I got stuck with the impedance measurement, i.e. for finding input impedance of rectifier using Cadence Virtuoso. As it is a non-linear circuit which simulation...
    Posted to RF Design (Forum) by Jithin on Mon, May 12 2014
  • Re: analogLib in cadence 6.1.5 (LNA simulation)

    Hi Marouf, You do not need an additional license to use analogLib if you have a license for Virtuoso IC6.1.5 and the Analog Design Environment. You do need to have a license to simulate spectre/aps in the Analog Design Environment. You didn't mention what version of MMSIM you are using. If you are...
    Posted to RF Design (Forum) by Tawna on Thu, May 1 2014
  • New Memory Estimator Helps Determine Amount of Memory Required for Large Harmonic Balance Simulations

    Hi Folks, A question that I've often received from designers, "Is there a method to determine the amount of memory required before I submit a job? I use distributed processing and need to provide an estimate before submitting jobs." The answer is yes! And this feature has helped me personally...
    Posted to RF Design (Weblog) by Tawna on Thu, Apr 24 2014
  • Double Exponential Current Pulse In Virtuoso

    Sir, Is it possible to model a double exponential current pulse ( used for representing Single Event Itransients) in Cadence Virtuoso?. It would be helpful if you could explain the method for getting the same. Yours faithfully Aravind
    Posted to RF Design (Forum) by aravindkvarier on Thu, Apr 17 2014
  • PSS simulation for RF LO and mixer simultaneously

    Dear Team, I am designed RF receiver in cadence. I have simulated oscillator and mixer individual. Now i am trying to simulate simultaneously. But PSS analysis is not running. Because beat frequencies for RF signal, LO signal and IF signal is different. How can i simulate it? Can you please guide me...
    Posted to RF Design (Forum) by Darshak on Tue, Apr 15 2014
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