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+// Calculate voltage gain Av
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 7-57 in page 359
+
+clear; clc; close;
+
+// Given data
+gm=2*10^-3; // Transconductance in mA/V
+rd=10*10^3; // Dynamic resistance in K-ohms
+C=0.025*10^-6; // Capacitance in microF 
+
+// Calculation
+Rl=(30*30)/(30+30);
+Av=(-gm*rd*Rl*10^3)/(Rl+rd);
+f1=1/(2*%pi*37.5*10^3*C);
+Avl=Av/sqrt(1+(f1/(5*10^3))^2);
+printf("(a)Av = %0.0f\n(b)Avl = %0.2f",Av,Avl);
+
+// Result
+// (a) Av = -30
+// (b) Avl = -29.94
+\ No newline at end of file
diff --git a/181/CH7/EX7.57/example7_57.txt b/181/CH7/EX7.57/example7_57.txt
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+(a)Av = -30
+(b)Avl = -29.94 
+\ No newline at end of file