1 files changed, 25 insertions, 0 deletions
diff --git a/1691/CH4/EX4.20/Exmp4_20.sce b/1691/CH4/EX4.20/Exmp4_20.sce
new file mode 100755
index 000000000..c8d49b9a8
--- /dev/null
+++ b/1691/CH4/EX4.20/Exmp4_20.sce
@@ -0,0 +1,25 @@
+//Example 4.20
+clc
+disp("Assume that the output time-constant is negligible as compared to the time consedtant. When this is the case")
+disp("A_vs = V_o/V_s = -g_m*R''_L*G''_s / G''_s+g_b''e+sC")
+gs=6.66*10^-3
+format(8)
+disp(gs,"where  G''_s = 1 / (R_s||R_b)+r_bb'' =")
+gbe=1/1000
+format(6)
+disp(gbe,"g_b''e = 1 / r_b''e =")
+rl=(0.5/1.5)*10^3
+format(7)
+disp(rl,"R''_L(in ohm) = R_L || R_C =")
+disp("  sC = admittance of C")
+c=100+(3*(1+(50*333.33*10^-3)))
+format(4)
+disp(c,"where  C = C_e + C_C*(1+g_m*R''_L) =")
+disp("At 10 kHz,")
+sc=2*%pi*10*153*10^-9
+format(8)
+disp(sc,"sC = 2*pi*f*C =")
+disp("Therefore, At 10kHz signal frequency")
+avs=(-50*333.33*6.66*10^-6)/((6.66*10^-3)+(10^-3)+(9.613*10^-6))
+format(6)
+disp(avs,"A_vs = V_o / V_s =")