# control logic for SAR ADC

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#### nijMcnij

##### Full Member level 1
successive approximation register

hello all,

i am designing a 10 bit charge redistribution Successive approximation register (SAR) ADC, the analog parts are easy to figure out and simulate, but the digital logic part which controls the switches and the SAR register is a bit tricky.

can anyone advise on that, maybe point out a relevant reference.

all papers that i got so far about the subject just deal mainly with the analog functionality of the ADC.

many thanks

#### Syukri

##### Full Member level 5
sar logic

SAR logicfunction:
1. Run binary searching
2. Storing comparator output
3. Register finish storing 10 bit give output signal and trigger another sample signal
4. Input to DAC

N6R

Points: 2

### N6R

Points: 2

#### nijMcnij

##### Full Member level 1

thank you suykri for your assistance

#### anhtuan

##### Member level 4

Syukri said:
SAR logicfunction:
i think you know clearly ,so can i ask you some questions?
i'm having thesis about design SAR ADC 8BIT ,but i haven't got schematic .if you have ,please send to me mail it to me ,thanks you very much .my mail address "panda251082@yahoo.com
"

#### crossbow_123

##### Member level 1

nijMcnij said:
hello all,

i am designing a 10 bit charge redistribution Successive approximation register (SAR) ADC, the analog parts are easy to figure out and simulate, but the digital logic part which controls the switches and the SAR register is a bit tricky.

can anyone advise on that, maybe point out a relevant reference.

all papers that i got so far about the subject just deal mainly with the analog functionality of the ADC.

many thanks

hi, you can refer to the book of Allen, it tell the SAR design, and have the logic figure.

#### iiiiisland

##### Newbie level 5
digital sar logic

thank you!
I am also designing a 10 bit sar adc. How to eliminate the offset of the comparator is the biggest problem for me as well as the accuracy problem.

the simulation results show the error is a little less than 1mv, but it have not contain the offset effect.

thank you very much for your help!

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