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SNR Calculation for ADC

kapileshwar

 Hi sir/madam/friends

 I'm working on sigma delta ADC

I used ocean script to retrieve the data from waveform but could not get itby running code

(i saved wavefom data  by printlvs option using calcualtor)

i  loaded the cadence output file into matlab

now how to use tht data!!!!!!!!!!!!!

please send me the code& related document

please please......i'm stuck at this point

I'm workin on all possible means 

can anyone  tell me code how to find SNR from .excel file or .csv file

 

please please

__________________________________________________________________________________________________--

my ocean script

ocnWaveformTool( 'wavescan )
simulator( 'spectre )
design(     "/home/mtech01/simulation/forwardddddpathtest/spectre/schematic/netlist/netlist")
resultsDir( "/home/mtech01/simulation/forwardddddpathtest/spectre/schematic" )
modelFile(
    include model file list
)
analysis('tran ?stop "2m"  )
desVar(      "sa" 20u    )
desVar(      "y" 1u    )

temp( 27 )
out = outfile("./paramresults.out" "w")
run()
selectResult( 'tran )
outputs()                                                 ; View the outputs
;Below, voltage measurements of VOUT_tran node are found at time points 0 to
;50 msec by increments of 1 msec.
for(tt 1 51
    time = tt*0.001 - 1*0.001
    fprintf(out "%5.3f    " time)                         ; Print the time stamp
    fprintf(out "%1.6e \n" value(VT("/VOUT_tran"),time))  ; Print the voltage associate with the time
)

ocnPrint( ?output "./my0file" v("net0123") ?precision 16 ?numberNotation 'scientific ?from 0 ?to 10noscript.ocn"?step 0.1n

close(out)
plot(getData("/net0123") getData("/net25") )

with regards!!!!!

 

  • Rather than using matlab to do the calculation, you could probably just use the spectrum function in IC61 (it's documented, and in the calculator, and available in OCEAN) to do this directly.

    I can't really advise you, because it's hard for me to see precisely what you're trying to do. Even if you do want to do it with Matlab, you'd be better off using the strobeperiod option on the tran analysis, so you get an output on a regular time interval, rather than doing this with the value() function, which is interpolating the result (and thus introducing numerical error). 

    Regards,

    Andrew.

  •  hello andrew ,thank you for your reply

     

    i think second option going for  strobeperiod options in transient analysis would be the better option after reading few articles & posts  on SNR from other sites too...

    can u or any one  please give me  basic information regarding additional options in transient simulation &

     

    skipstart...skipstop...strobe period ... & how to set output parameters...

    thanks please be in touch

    with regards...

    mnk  :)

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