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Question on Sigma Delta Modulator Modeling

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gmcfilter

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HI everybody

Now I'm4th order feedback single bit SDM modeling

In my modeling

sampling frequency 1MHz OSR=125

multipling the OSR 2^N the SNR is increased

but multipling the OSR 3 5.. (not 2^N) SNR id decreased

I don't know what is problem

OSR ration must constant ?? not a floating??
 

needforspeed

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gmcfilter said:
HI everybody

Now I'm4th order feedback single bit SDM modeling

In my modeling

sampling frequency 1MHz OSR=125

multipling the OSR 2^N the SNR is increased

but multipling the OSR 3 5.. (not 2^N) SNR id decreased

I don't know what is problem

OSR ration must constant ?? not a floating??

how did you multipy OSR?
 

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