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Member of: Equations

We should all know these equations by heart, but somtimes we forget:

n-Channel

  • Cut-off (pinch off) : i_d = 0
  • Ohmic: i_d = \frac{W}L \frac{K_p}2 (1 + \lambda v_{DS}) v_{DS} [ 2(v_{GS} - V_{TH}) - v_{DS} ]
  • Saturation: i_d = \frac{W}L \frac{K_p}2 (1 + \lambda v_{DS}) (v_{GS} - V_{TH})^2

p-Channel (reverse the signs, or switch the subscripts)

  • Cut-off (pinch off) : i_d = 0
  • Ohmic: i_s = \frac{W}L \frac{K_p}2 (1 + \lambda v_{SD}) v_{SD} [ 2(v_{SG} - V_{TH}) - v_{SD} ]
  • Saturation: i_s = \frac{W}L \frac{K_p}2 (1 + \lambda v_{SD}) (v_{SG} - V_{TH})^2

See also:

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Last edited by DrLock. Originally by DrLock.