Analog to digital converter

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How to increase the combinations from a to d
converter without increasing resistors???
NOTE: Use only 3 resistors but get more than 4 combinations...
 

3 separate resistors with 2 switches can be used to make more than 4 combinations for ADC input. like
Patterns S1 - Switch 1 S2 - Switch 2 Output voltage at ADC
1 Open Open R1
2 Close Open R2/(R1+R2)
3 Open Close R3/(R1+R3)
4 Close Close (R2||R3)/(R1+(R2||R3))
 

PLS I want to know the detail inner circuit design of SAR control logic or SAR function using Dfilp-flop


Can you help me?
 
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It seems not possible without using switch or without any voltage varying circuit as an input to ADC...:|

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monthin said:
PLS I want to know the detail inner circuit design of SAR control logic or SAR function using Dfilp-flop


Can you help me?
Click to expand...

You can find basic understanding of SAR working on following link:
http://www.maximintegrated.com/en/app-notes/index.mvp/id/1080

For more details of SAR usage using DFlipFlop in the following link.
http://www.ijreat.org/Papers%202014/Issue7/IJREATV2I1026.pdf

Detailed and patient study would be required for understanding of SAR..:thumbsup:
 

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