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Capacitor matching and routing in SAR ADC

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sanjaytamne

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I am doing the layout of SAR ADC in which I have 4p,8p,16p,32p, 64p, 128p caps which are to matched. Can any one help me how to match these caps and how to route(routing over caps is not permitted)
 

leo_o2

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capacitor matching

Use 4p for a cell.

FFF
FEFFFEF
FDEDEDF
FFECECEFF
FEFEDBABDEFEF
FFECFCEFF
FDEDEDF
FEFFFEF
FFF

Added after 1 minutes:

It seems all "blank" are screened. The matrix should be adjusted.
 

panyi

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Re: capacitor matching

Hi leo_02:

Thanks for your reply. It is also important to me.

Could you help giving particular description of the your answer? Maybe you can replace "blank" to "•" "×" or other symbols.
 

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