Capacitor matching and routing in SAR ADC

[sanjaytamne]

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]

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]

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.