What is Threshold voltage?
The threshold voltage, Vt of a cell depends on the channel doping of a MOS transistor. As doping in the channel increases the gate threshold voltage increases because the gate voltage needs to deplete more majority carriers before a minority carrier channel can form.
LVT → Low Vt cells
SVT → Standard Vt or Nominal/Regular Vt cells
HVT → High Vt cells
Some facts about Vt:
Channel doping increasing order
Cell delay reduces in this order
Cell leakage increases in this order
It allows you to use LVT and SLVT in timing-critical paths for high speed, and HVT for normal operation.
What is the difference between high VT and low VT cells?
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