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interdigitation matching for current mirror devices and common centroid for differential pair devices:
Interdigitation Matching:
Purpose: Interdigitation is employed primarily to mitigate gradient errors in device matching.
Explanation:
In interdigitation, adjacent devices are interleaved, alternating their positions. For instance, if we have two transistors (A and B), the arrangement could be “A|B B|A.”
This pattern reduces the impact of first-order gradient errors. These errors occur due to variations across longer lengths on the chip.
Interdigitation focuses mainly on X variations (i.e., variations along one axis).
Application:
Current mirrors are often matched using interdigitation because they require minimal matching of gate-source voltage (V<sub>GS</sub>).
Common Centroid Matching:
Purpose: Common centroid matching aims to minimize systematic errors in device matching.
Explanation:
In common centroid, devices are balanced so that their centroids (centers of mass) coincide. This eliminates first-order gradient errors.
Common centroid considers both X and Y variations (variations along both axes).
Application:
Differential pairs (used in amplifiers, ADCs, etc.) are matched using common centroid. Achieving precise matching is crucial for their performance.
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