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SAR ADC formula comparison

yefj

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Hello ,the general form of SAR ADC is as shown bellow in the formula but when i try to develop the 3 bit private expression for 3 bit as shown bellow:
i try
101 is 4C+C
But i cant see how \[ \frac{(N-X)}{N}=5/8 \]
N=2^3 X=3
X is Bits that set in a givern corevention
why in our private case X=3?
Thanks
1600520216628.png
 

yefj

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Hello,we have a genral formula for the SAR ,
N=2^3-8
Why X=3 ? (bits that set in a given convertion)

1600543116478.png
 

sutapanaki

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Maybe it is good to give a link to the thing you are reading so people can get the whole picture.
 

yefj

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Hello,The genaral formula on slide 18 of the attached leacture
i am tryong to understand why th provate case in slide 14 means X=3?
Thanks
 

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yefj

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Hello,In the formula shown bellow why the charge between V+ and GND is minus to the charge of Vref and V+ ?
Thanks.

1600591591305.png
 

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