resistor match in layout

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ebuddy

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Hi,

Two resistors in layout need to be matched. Why do we have to make sure current flows the same direction in these 2 resistors? Thanks.
 

For resistor matching,
1.Two resistors to be placed in interdigitation fashion
2.Place them in a guardring , by which they see the same environment all around
3.Place dummies at the end.
 

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