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one question about DSM

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Ray Ch

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Hi guys. nowadays i'm learning Delta-sigma ADC.

i'm too confused because of one problem...

캡처.PNG
ficture from understanding Delta-Sigma data converters by Richard Schreier

here's the image related to my Q

as you can see

there's single tone input at 2*10^-3 (normalized frequency)
(OSR=512)

but the image says OSR is 128. i though it's contradictory

not only this image, all the images included in that book show similar

graphs . please help me
 

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