Stats

  • Locked Locked
  • Replies 2
  • Subscribers 126
  • Views 18956
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Calculate DNL of a DAC in Cadence

HasanAr

Hi all,

I was wondering if there are any ways to calculate DNL of a DAC in Cadene without SKILL scripting or moving data to MATLAB.

The "DNL" function in the calculator seems hard to be used and haven't been successful to use. I have also tried to use vector subtraction that didn't work as well (subtract dac output value at "i+1" and "i")

I was just wondering if there is a simple way to find the DNL in cadence. 

  • drdanmc

    It would be helpful to share what you tried that didn't work when you tried the dnl() function in the the waveform calculator.  Per the manual (Virtuoso Visualization and Analysis XL User Guide, Calculator Functions, Special Functions, dnl), the calculation is pretty much what you have said.  dnl[k (or maybe k+1)] = (sig[k] - sig[k-1])/ideal_step - 1.  Part of the trick in using this function is how to specify the time points.  Make sure you read that part carefully.  You either have to supply the sampling interval, a list of time points, or a clock waveform whose edges define the sampling points to the function.  In addition, you need for your simulation to step the DAC through its codes.

  • HasanAr
    in reply to drdanmc

    Thanks for your reply!

    The clock period and pulse width are 8u and 4u, respectively. So I set the "Sampling signal/list/step" to 8u. The result doesn't seem to be correct to me. Is there anything that I am missing?

    Waveform--v("/out" ?result "tran")

    Sampling signal/list/step--8e-06

    Cross Type--rising

    mode--auto

    Threshold--0.0

    Delay--4.0e-06

    Method--end

    Unit--abs

    No. of Samples--256

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.