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https://designersguide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> Sigma Delta Modulator SNDR with MonteCarlo Simulation in Cadence https://designersguide.org/forum/YaBB.pl?num=1510634444 Message started by MehdiOranji on Nov 13^{th}, 2017, 8:40pm 
Title: Sigma Delta Modulator SNDR with MonteCarlo Simulation in Cadence Post by MehdiOranji on Nov 13^{th}, 2017, 8:40pm Hello, I want to simulate a continuous time sigma delta modulator SNDR with MonteCarlo simulation in Cadence and see the histogram of the SNDR so as to figure out how the device mismatches impact the modulator performance. I have the output bit stream of the modulator quantizer, I have no idea how to fed the output to the montecarlo simulation and endup with the histogram showing "#counts vs. SNDR". I would appreciate it if someone let me know how to do that. Regards, Mehdi 
Title: Re: Sigma Delta Modulator SNDR with MonteCarlo Simulation in Cadence Post by sheldon on Nov 14^{th}, 2017, 10:49am Mehdi, Steps 1) Setup your test bench to run the DeltaSigma SNDR simulation 2) Use the ViVA measurements: SINAD 3) Save the SINAD results to the ADE outputs 4) Run Monte Carlo, in Explorer or Assembler 5) Plot the Histogram when done 6) Use Contribution Analysis to analyze mismatch See my blogs on the Cadence Community site The output of the DeltaSigma modulator is a PWM signal, you can perform an FFT on it and get spectrum. Sheldon 
Title: Re: Sigma Delta Modulator SNDR with MonteCarlo Simulation in Cadence Post by MehdiOranji on Nov 14^{th}, 2017, 11:16am Thanks Sheldon for your kindly response. The problem is that I am using Cadence 5.10.41 which does not have the viva calculator and the explorer. Do you have any idea how I can do the job in Cadence 5. 
Title: Re: Sigma Delta Modulator SNDR with MonteCarlo Simulation in Cadence Post by sheldon on Nov 14^{th}, 2017, 5:25pm Mehdi, The calculator has a dft and can be used to create a spectrum. You will need to write a Skill function to calculate the SNDR. Sheldon 
Title: Re: Sigma Delta Modulator SNDR with MonteCarlo Simulation in Cadence Post by MehdiOranji on Nov 14^{th}, 2017, 5:48pm I have no idea about the SKILL function. Where should I write the function and load and How I can use its output. Even If you have a sample program, I would appreciate it. Thanks, Mehdi 
Title: Re: Sigma Delta Modulator SNDR with MonteCarlo Simulation in Cadence Post by polyam on Nov 20^{th}, 2017, 8:34pm Hi Mehdi, I have two questions for you? 1 Mismatch analysis of what block you are interested in? 2 Are you going to do an MC analysis for a fully transistor level delta sigma? tnx MehdiOranji wrote on Nov 13^{th}, 2017, 8:40pm:

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