博文速递：Types of Standard Cell Libraries

作者：Feroz Ahmed Choudhary

Types of Standard Cell Libraries

Standard Cell Library Types

·According to the Density

·According to the Threshold Voltage (VTH)

Classification according to the Density

·Ultra High Density (UHD) - 7 Track or 8 Track

·High Density (HD) - 9 Track

·High Performance (HP) - 12 Track

Classification according to the Threshold Voltage (VTH)

·Low VT (LVT) - Fast because of low Gate Delay, but high leakage

·Standard VT (SVT) or Regular VT (RVT)

·High VT (HVT) - Low leakage, but slow because of high Gate Delay

·Metal 2 pitch is used to calculate the Number of Tracks in different Density Libraries

·Sub-threshold Leakage varies exponentially with VTH compared to the weaker dependency of Delay over VTH

·HVT Cells are used in Non-critical paths to reduce Leakage Power while SVT Cells are used in Critical paths to met Timing

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