how to calculate dnl/inl for SAR ADC?

[abhisek.dey007]

Hi,
I have designed a 12 bit SAR ADC in cadence. Can anyone plz guide me how to get the dnl/inl of the ADC by exporting the data to matlab? My queries are-

1) Plz help me get a gud .m file for the purpose.
2) I have done the transient simulation of the SAR ADC putting an ideal DAC at the end of this. I've saved the data(including the input ramp data) in tabular form in .csv file. Is that okay?
3) How to use this .csv file to run the matlab code for dnl/inl calculation?

 

[JoannesPaulus]

There are plenty of posts in this forum about DNL/INL, for instance: https://www.edaboard.com/threads/156922/#post667210
A good starting point for a matlab code is: https://inst.eecs.berkeley.edu/~n247/matlab_files/inldnl.m

 

[abhisek.dey007]

Joannes

thnx for the matlab code. can u tell me how i feed that .csv file data in to this code?

one more thing,wat's the meaning of this part?
error('must specify ADC output')

 

[JoannesPaulus]

The .csv format is not easily read by matlab. You will need to edit the file, remove the first line and replace the comma that separates the time and data with a space or a tab. At this point you can use the load function in matlab (type help load for its syntax). Play around...

one more thing,wat's the meaning of this part?
error('must specify ADC output')

If the input variable is not supplied the program cannot proceed and shows an error.

 

[howardtang85]

There are plenty of posts in this forum about DNL/INL, for instance: https://www.edaboard.com/threads/156922/#post667210
A good starting point for a matlab code is: https://inst.eecs.berkeley.edu/~n247/matlab_files/inldnl.m

Hi, may I know the input code should be binary code or decimal code?