MOSFET Explained

Linear Region: (triangle sign) (VDS&lt;Vg), Vg = VGS -Vth ID = 2K*(VGS – Vth) VDS – VDS^2] Saturation Region (VDS &gt;Vg) (Rectangle sign): ID = K*(VGS – Vth)^2 *(lambda *VDS+1) K= transconductance (constant) Kp= transconductance parameter (MCox) constant . for N cnannel MOSFET Kp = Kn and for P channel MOSFET Kp = Kp. Note: Kn~ =3*Kp * Small MOSFET: 20 to 200 Micro A/V^2 *Power MOSFET: 1 to 10 A/V^2 K = (Kp/2).W/L gm (forward transconductance) measured by Siamon (S) =A/V gm = 2K*Vg Lamda: length modulation factor. lamda = o means flat(no change in ID in saturation region). Lamda (.01 to .1) = LD in Saturation. check ID -VDS curve. Note: 1. if MOSFET has no bar or triangle its OFF 2. Lamda can be assumed 0 3. Small MOSFET (&lt;2AMP) Width / Length ≈ 100 4. Medium (2 to 5 Amp) W/L = 500 5. Large (20 to 50 A) W/L = 100,000 6. Very large (&gt; 100 A) W/L = 500,000 7. m is milli, n is nano, u is micro <br>

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