how to simulate sigma delta modulator using simulink

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nani

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power spectral density simulink

hi can any one give me idea how to simulate power spectral density of the sigma delta modultaor(digital) output using simulink

i want to observer the high pass nature of quantization noise at the sigma delta output
( i am using MASH 1-1-1)and i want to check how its characteristics varies with other topologies and with intial conditions

can any one give me simulink file for this .Any suggestions are welcomed

THANKS IN ADVANCE
 

mash 1-1-1 simulink model

hi,

can any one post the matlabcode or simulink used to calculated psd for sigma delta modulator( fractional n frequency synthesizer)
 
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    maram

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psd in simulink

see this file
this the delta sigma toolbox with full details
 

sigma delta modulator simulink

If you have got transient results, just do a fft, you can get the psd.
 
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    dridi

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simulink noise sigma delta modulator

what we have to specity for the fft block, im not getting any out put it is showing warning.
 

mash 1-1-1+simulink model

im able to get the psd but it's not in db it is in power/radians per second. can any one tell me how to get the psd in db. Thanks in advance.
 

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