isuue in the output of my sigma delta modulator

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abdoo

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hi,

i'm trying to design a sigma delta modulator using matlab

i'm expecting a digital stream where impulse frequency changes for ex when applying a sine wave as input

but what i found is a bit stream with constant frequency

i had attached the matlab code,

the sample time is Fs * 64,

kind regards,

abdoo
 

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  • SDM2.rar
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SDM output is rather pulse density than pulse frequency modulated. You'll see a varying frequency only near minimum and maximum signal level.
 

FvM said:
SDM output is rather pulse density than pulse frequency modulated. You'll see a varying frequency only near minimum and maximum signal level.
Click to expand...

Thank you Fvm

yes i know this but even near minimum and maximum i did not see the pulse density.
 

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