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some questions about a particular SAR ADC

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peter_hawk

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Hi, all:

According to the SAR ADC circuit below, I can't figure out how this ADC works by adding CS & CATT.
Can anyone give me some hints?
Thanks a lot!
 

It depends on the timing of the switch. Cs is used to get a equival cap C. The Cs=2C, the serial Cap with Cs should be 2C. You can try to find the correct switch time based on this.
 

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