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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

  • PSS Analysis's reliability-Difference between time domain response in PSS and Tran analysis
    I'm designing a wide band matching network to drive an antenna.The output pulse at the output of pulse generator is delivered to one N1PORT as the antenna model thet refered to a S1P file with value from 1GHz to 8GHz. I want to use this interface between antenna(S1P port with n1port component) and...
    Posted to RF Design (Forum) by Imank on Thu, Apr 12 2012

  • High frequency quadrature VCO design with good phase noise
    Hello everyone I am a newbie engineer starting my career in RF IC design and working on designing a high frequency VCO (38 GHz) with good phase noise characteristics. I am using Cadence IC6.1.5-64b.500 version and spectre simulator for the schemtic design and simulations. I have to do everything from...
    Posted to Custom IC Design (Forum) by rohan kr on Thu, Mar 29 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

  • Measuring Fmax for MOS Transistors
    The following question has come up in comments: "How do I measure F max for an MOS transistor?" The measurement methodology -- testbench, analysis, calculator setup, stimulus, etc.-- does not change whether you are measuring bipolar transistors or MOS transistors. On the other hand, the results...
    Posted to RF Design (Weblog) by Art3 on Thu, Aug 11 2011

  • NPORT: mismatch between number of noise parameters and number of ports
    I am using Cadence IC 6.1.3. I have a problem simulating the specific attached touchstone file using the nport component. After netlisiting, I get the following error *** START error **** ERROR (SPECTRE-10008): "xxx/sqvco8_xcouple.s8p", line 163: Error:Mismatch found between number of noise...
    Posted to RF Design (Forum) by elbadry on Wed, Apr 6 2011

  • spectrum analysis of RF power amplifier output
    Hi, I am using cadence icfb version IC5.1.41 and process 65nm to design a RF PA. I have finished my design and did transient analysis. In time domain the signal can be plotted but I was unable to view the output spectrum using DFT function. Can someone help ? is there any particular point...
    Posted to RF Design (Forum) by whlinfei on Tue, Apr 5 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

  • My Favorite nport Settings for Spectre and SpectreRF
    The nport component located in analogLib can be used in circuits for Spectre and SpectreRF simulations. It is a scattering parameter (S-parameter) based distributed multi-port element. The nport truly is a "black box"… It can be used to model dramatically different systems, such as:...
    Posted to RF Design (Weblog) by Tawna on Wed, Mar 23 2011
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