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What accuracy of capacitor match can I get if I use .25 or .35 process?

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carlyou

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what accuracy of capacitor match can I get if I use .25 or .35 process? Thanks very much.
 

Re: capacitor match

it varies from absolute matching or relative matching
 

capacitor match

can you tell me the different ratios respectively?
 

capacitor match

absolute matching:
ideal cap Ci
the fact: Cf

|Cf-Ci|
--------
Ci

relative matching :
C1 and C2

Δ C1
----------
C1
-----------------
Δ C2
----------
C2

Normaly,absolute matching is about 10% to 30%,
where relative matching below 1%
 

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