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RFIC,spectreRF

  • 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
  • Transient results as starting point in PSS

    Hello, Could we use the transient analysis results as a stabilization point (tstab) for PSS analysis? If so, how could we acheive it? Is there any documentation on this? Any inputs will be helpful. Prakash.
    Posted to RF Design (Forum) by pthoppay on Mon, Mar 10 2014
  • Issue with Envelope analysis

    Hi, I am simulating the I/Q upconversion using port through envelope analysis. The I input pwl file has samples of a cosine of frequency=5MHz and timestep=0.00125us. The Q input pwl file has samples of value=0 and timestep=0.00125us. The original I, Q pwl files have data upto 2ms. I have attached the...
    Posted to RF Design (Forum) by AparnaG on Sat, Mar 8 2014
  • modelling reflection in Cadence Virtuoso

    Hello Sir, I have been trying to design a UHF passive RFID tag in 130nm on Cadence Virtuoso IC 5.4.1. As for the design of a matching network between Antenna and Rectifier of RFID please tell me how reflections, if not matched, been modelled in Cadence Virtuoso. So whether I have to use any specifice...
    Posted to RF Design (Forum) by Jithin on Wed, Feb 26 2014
  • Have You Tried the New Transmission Line Library (rfTlineLib)?

    Happy New Year! Have you tried the new Transmission Line Library (rfTlineLib) yet? In case you missed it, rfTlineLib was introduced in IC 6.1.6 ISR1 plus MMSIM 12.1.1 -or- MMSIM13.1. You may wonder....Why should I use the new rfTlineLib ? Well.....here are a few reasons: Accurate and robust Consistent...
    Posted to RF Design (Weblog) by Tawna on Fri, Jan 3 2014
  • SpectreRF at 2013 IEEE/MTT-S International Microwave Symposium in Seattle, Washington

    If you are attending the International Microwave Symposium ( IMS 2013 ) in Seattle (June 2-7, 2013) stop by the Cadence Design Systems booth, #427. We will be showing new MMSIM12.1.1 features including “Smart” HB GUI, Robust and easy to use nport (for s-parameter input), and the Transmission...
    Posted to RF Design (Weblog) by Tawna on Thu, May 23 2013
  • 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
  • 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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