5. For the circuit shown in Fig. 5, the input current is IREF that goes into N1. Applying the devices dimensions N1=(W/L), N2=2(W/L), N3=4(W/L), N4=8(W/L), N5=16(W/L), P1=(W/L), P2=2(W/L), where W and L are channel width and length, respectively. What are the currents for N3 and N5, respectively? (10%)