1. The problem statement, all variables and given/known data VOUT, they mean DC 2. Relevant equations See picture, r0 is neglected also lambda (channel modulation) 3. The attempt at a solution I calculate I DS with the formule given: 0.400*(0.5)²=0.1 mA IOUT = 5/25000 = 0.2 mA So the current source has got to be 0.1 + 0.2 = 0.3mA. Thats the DC current it has to be delivered right? I also had to calculate the AC gain: gm = K (VGS - VT) = 0.4mA/V vin = vgs vout / vgs = -gm * vgs * RD = -10 This correct?