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Calculate INL DNL SNR by .measure command (Read 14277 times)

rehzad-zhao New Member Offline Posts: 3 shenzhen china	Calculate INL DNL SNR by .measure command Nov 28^th, 2005, 10:23pm hi, Now I am designing an 10bits pipelineADC. The .measure command In Hspice can make ADC digital output to a text file. How to edit .measure command file to Matlab to calculate INL DNL SNR SFDR and more something? Thinks
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packiaraj

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Re: Calculate INL DNL SNR by .measure command
Reply #1 - Nov 29^th, 2005, 3:09am

Hi,
It should not be difficult if u know that Spectre-IC5141 comes with VerilogA models for measuring INL and DNL. I feel its bit difficult with .measure statement. In "ahdlLib" u can find "adc_dnl_8bit" and "adc_inl_8bit" Verilog A models that can write the INL and DNL values for Individual Codes of ur ADC. These models can be included in deck file as instances for calculating INL and DNL during simulation.

Thanks,
Packiaraj.V.

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rehzad-zhao New Member Offline Posts: 3 shenzhen china	Re: Calculate INL DNL SNR by .measure command Reply #2 - Nov 30^th, 2005, 2:32am Thinks Packiaraj.V.,but I know little about VSpectre-IC5141. I always use the eda tool Hspice. Rehzad
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ywguo Community Fellow Offline Posts: 943 Shanghai, PRC	Re: Calculate INL DNL SNR by .measure command Reply #3 - Nov 30^th, 2005, 6:22pm Dear Zhao, You could write a matlab program to calculate any parameters of the ADC after you record the output of the ADC. Theoretically, you can record the output using .measure, .print and maybe other cards. Best regards, Yawei
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rehzad-zhao New Member Offline Posts: 3 shenzhen china	Re: Calculate INL DNL SNR by .measure command Reply #4 - Dec 2^nd, 2005, 2:33am Thinks Yawei, I attempt to do it now. Could you provide some details about what you have said. Or give me some document about it. My email is: rehzadzhao@yahoo.com Best regards zhao
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jim Junior Member Offline Posts: 14	Re: Calculate INL DNL SNR by .measure command Reply #5 - Dec 28^th, 2005, 5:39am Dear Yawei , Could you please provide some details about how to record ADC digital output to a text file using .measure, .print and how to calculate INL DNL...using Matlab? My email is: fujj_2003@163.com Thanks a lot! Best Regards, Jim
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chuzi Junior Member Offline Posts: 12 BeiJing China	Re: Calculate INL DNL SNR by .measure command Reply #6 - Dec 28^th, 2005, 11:34pm Rehzad and Jim, � �I am just doing the same thing you do. My way is use .stim to collect data into a text file, then import to matlab, you can find .stim in hspice manual. � �hope it helps, � � � � � � � � � � � � � � � � chuzi
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jim Junior Member Offline Posts: 14	Re: Calculate INL DNL SNR by .measure command Reply #7 - Dec 29^th, 2005, 2:28am Hi chuzi, Thanks for your reply, Could you please provide a example about using .stim to collect data into a text file for me? Thanks in advance. Best Regards, Jim
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chuzi

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Re: Calculate INL DNL SNR by .measure command
Reply #8 - Dec 29^th, 2005, 5:07pm

Hi Jim,
� �I use it in this way:
.stim tran VEC filename=SDADCtest.data ovar1=v(y1) ovar2=v(y2) ovar3=v(y3) from=10us to=1010us +npoints=20001
.tran 100p 1010us
VEC means vector, from=10us is circuits settle time, npoints=20001 is the FFT's NP, then I choose 16384 points from it.
� �Hope it helps.
� �Best regards.
� �chuzi

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jim Junior Member Offline Posts: 14	Re: Calculate INL DNL SNR by .measure command Reply #9 - Dec 29^th, 2005, 6:29pm Hi chuzi, Thanks a lot for your help! Best Regards, Jim
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jim Junior Member Offline Posts: 14	Re: Calculate INL DNL SNR by .measure command Reply #10 - Feb 25^th, 2006, 2:58am Hi chuzi, I use the method which you mention above, but Hspice didn't produce .data file. BTW, is the .data file Binary code file? Thanks in advance. Best Regards, Jim
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