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+// Example 6.8 : Analysis of CMOS CS amplifier

+k_n=200*10^-6; // (A/V^2)

+W=4*10^-6; // (m)

+L=0.4*10^-6; // (m)

+I_REF=100*10^-6; // (A)

+V_An=20; // (A)

+I_D1=0.1*10^-3; // (A)

+V_Ap=10; // (V)

+V_DD=3; // (V)

+I_D2=0.1*10^-3; // (A)

+V_tp=0.6; // (V)

+V_tn=0.6; // (V)

+g_m1=sqrt(2*k_n*(W/L)*I_REF);

+disp(g_m1,"g_m1 (A/V)")

+r_o1=V_An/I_D1;

+disp(r_o1,"r_o1 (ohm)")

+r_o2=V_Ap/I_D2;

+disp(r_o2,"r_o2 (ohm)")

+A_v=-g_m1*r_o1*r_o2/(r_o1+r_o2);

+disp(A_v,"A_v (v/V)")

+I_D=100*10^-6; // (A)

+k_n=65*10^-6; // (A/V^2)

+V_OV3=0.53; // (V)

+V_SG=V_tp+V_OV3;

+disp(V_SG,"V_SG (V)")

+V_OA=V_DD-V_OV3;

+disp(V_OA,"V_OA (V)")

+V_IB=0.93; // (V)

+V_IA=0.88; // (V)

+disp(V_IA,V_IB,"Coordinates of the extremities of the amplifier V_IB and V_IA")

+deltavI=V_IB-V_IA; // width of amplifier region

+V_OB=0.33; // (V)

+deltavO=V_OB-V_OA; // corresponding output range (V)

+deltavObydeltavI=-deltavO/deltavI; // Large signal voltage gain (V/V)

+disp(deltavObydeltavI,"Large signal voltage gain (V/V)")
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