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sigma delta digital output?

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chungming

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I has a question about the digital output of comparator.
Like attached file , the comparator has two output Vo+ and Vo-
Then i want to get the PCM signal , is only get Vo+ to do next step(FFT analysis)?
or get the differential output (Vo+) - (Vo-) to do next step?

I had already checked that , there are have some difference.
Which are the correct output , single ended or differential ?
thanks~~!!
 

only difference in dc,
snr is same.
 

swicap said:
only difference in dc,
snr is same.
Click to expand...

thanks~~
Can you give me more suggestion please ~~~

thanks a lot~~
 

Vo+,and Vo- are output of comparator. They are digital output.
So in my eyes, they are the same except in DC.
They have same frequency information in fact.
Single/differential is only meanful for analog signal.

u can have a try: DFT a sequence in matlab [1 0 0 1 .......
and [1 -1 -1 1.......] , and compare them.
I don't know why u have different results.
u can send me ur vo+ and vo- output sequence
in txt. I can examine it if possible.
 

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    chungming

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