Consider the MOSFET amplifier of Fig P7126 This circuit is a

Consider the MOSFET amplifier of Fig. P7.126. This circuit is an example of NMOS, a technology in which circuits are made entirely from n-channel MOSFETs. Find the bias value of v_OUT if all MOSFETs have V_TR = 1 V and K = 1 mA/V^2 except for Q_3, for which k_3 = 8 mA/V^2. Find the small-signal gain v_out/v_s.

Solution

(a)Q1 is on and it act as a pass transistor nmos is weak one it cant transfer complete level to the other side so Drain potential at Q2= 15 - Vtr =14V Q2 is on and it act as a pass transistor nmos is weak one it cant transfer complete level to the other side so Drain potential at Q3= 14 - Vtr =13V Q3 is on because of Qc so Vout= 13+3=16V

(b) gain = gmRd