firsttimedesigning
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sar capacitor mismatch
I have been trying find some information on what cause capacitor mismatch,
so far the only thing that I know is that there is a random edge variation. Other possible causes such as undercut, long range gradients. They all can be eliminated using common centroid geometry. What I would like to know though is that how much effect does random edge variation on the capacitor ratio? And why do people say it is easier to match two big capacitors rather than two small capacitors? Is it because the random edge variation depends on the size of the capacitor. The random edge variation probably differs from technology to technology. But can anyone give me a general value? like an average value or something.
I have been trying find some information on what cause capacitor mismatch,
so far the only thing that I know is that there is a random edge variation. Other possible causes such as undercut, long range gradients. They all can be eliminated using common centroid geometry. What I would like to know though is that how much effect does random edge variation on the capacitor ratio? And why do people say it is easier to match two big capacitors rather than two small capacitors? Is it because the random edge variation depends on the size of the capacitor. The random edge variation probably differs from technology to technology. But can anyone give me a general value? like an average value or something.