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resolution of 12bit SAR ADC

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patato

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I am currently working on a low speed SAR ADC(around 10KHz sample rate)
is it possible to get a 12bit resolution with 6bit(from resistors) + 6bit (from capacitors)?

i know it's possible to get 10bit from poly resistors, but not so sure about capacitors.
 

capacitor is better
 

Be carefull...

6 bit MSB should have 12 bit accuracy not 6 bits. Neither resistor (~8 bits) nor capacitor (~ 10 bits) will give you 12 bit accuracy if you do not employ circuit techniques (like calibration, trimming ).
 

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