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Help me with pipeline ADC modeling using Simulink/Matlab

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suhas_shiv

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Need Help with ADC

I am doing a pipeline ADC modeling using Simulink/Matlab. I am getting the ADC output plot. Now I have written a code for INL/DNL (in a m-file). I want to pass on the output plot(basically the values) from Simulink as input to the m-file. How can I do this? Can anyone please explain(step-by-step if possible)?

Next I want to see the SFDR of the ADC. I was thinking of inputting a sine wave and then doing a FFT on it and plot the frequency spectrum to find the range. Is my thinking correct? I would appreciate if someone could help me out. Thanks.
 

Need Help with ADC

u can export ur adc output to matlab workspace,
and then use ur inl.dnl mfile to analysize it.

u r correct.
 

Need Help with ADC

Thanks, but which block do I use in Simulink? The "to workspace" block? Or is there any other block which will help me do it?
Basically I want to pass on the ADC output onto a function(wherein the ADC output is stored in variable X). This variable X is the input to the function.
 

Need Help with ADC

block 'to workspace' can do that.

if u want a simulink block to process data directly,
use 'user defined function' block.
change variable name to 'u'.

In fact, u needn't use such a block, if u just want to see the inl.dnl curve.
 

Need Help with ADC

Thanks for the tip. I tried using the "to workspace" block and stored the values as variable X. When I run the matlab file it doesn't read X for some reason. I guess I might be doing something wrong or not passing on the values in the correct way.

I will try using the user defined block and see if it works.
 

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