Common_Centroid - Basic Differential Pair Layout D1 G1 D2...

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Basic Differential Pair Layout active poly G1 Q 1 30/1 Q 2 30/1 D2 D1 S G1 G2 G2 D1 D2 S S Good matching in the absence of cross-chip gradients; both drain currents flow in same direction. Alternative Differential Pair Layout active poly G1 Q 1 30/1 Q 2 30/1 D2 D1 S G2 D1 D2 S G1 G2 More compact, but worse matching than previous case; drain currents flow in opposite directions.
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Common Centroid Layout active poly G1 Q 1 15/1 M = 2 Q 2 15/1 M = 2 D2 D1 S G2 G1 D1 S G2 D2 S G2 D2 S G1 D1 S Q 1 and Q 2 have a °common centroid±, which makes them immune from cross-chip gradients. Best matching performance possible. Alternative Common-Centroid Layout active poly G1 Q 1 15/1 M = 2 Q 2 15/1 M = 2 D2 D1 S G2 D1 S D2 D2 S D1 G1 G2 G1 G2 Immune from cross-chip gradients like previous case, but area is saved by sharing sources.
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Differential Pair with Very Wide Transistors active poly G1 Q 1 30/1 Q 2 30/1 D2 D1 S G2 D1 D2 S G1 G2 Very wide transistors can lead to awkward layout and significant series gate resistance.
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