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In general transistor mismatch refers to the measurable differences in the electrical proporties such as Ic, β, gm between two identically designed and layout devices. Analog designers think a lot about matching.
Basic operations of some circuits like ADCs directly depends on matching.
The CMRR of an op-amp limited by matching since it uses differential amlifier, and offsets greatly degrade the performance of bandgap references.
Mismatch leads to device-device threshold voltage variations.
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