Tuesday, March 15, 2011

7.3 Actual MOSFET Characteristics

  • SR model of MOSFET is inadequate when VDS >= VGS - VT 
  • MOSFET characteristics match the SR model for a fixed value of VGS, VGS >= VT and VDS is small (VDS < VGS - VT) :
















  • IDS begin to saturate when VDS approaches the value of VGS - VT


















  • Saturation region of MOSFET operation

































  • SR and SCS (switch current source) model:




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