LSI design flow and EDA

In analog layout, which technique splits paired transistors and places them so their centroids coincide?

  1. ACommon-centroid layout
  2. BStandard-cell placement
  3. CClock tree synthesis
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Answer: A. Common-centroid layout

For transistor groups where matched characteristics are important, such as differential pairs and current mirrors, the transistors are split and placed alternately so their centroids coincide, cancelling the effect of gradients in film thickness and doping across the wafer. This is called common-centroid layout.

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