forkschgrad said:can it be used as a protection elements?
tfwee said:Filler cells are used to fill any spaces between regular library cells to avoid planarity problems. They are need when the density of the required metal or layer has not meet the foundry or fab requirement. Thus, you need to add it whether it is low or high frequency.
Yes, you are right. There are special cells (tie-high and tie-low) that provide constant values for the regular cells. The reason is ESD.
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