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+// Calculate Av,Zo,Zi
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 7-28 in page 332
+
+clear; clc; close;
+
+// Given data
+Rd=15; // Drain resistance in k-ohms
+Rg=1; // Gate resistance in M-ohms
+rd=5; // Dynamic resistance in k-ohms
+gm=5; // Transconductance in m-mho
+Vdd=20; // Drain voltage in volts
+
+// Calculation
+mu=rd*gm;
+Av=(mu*Rd)/(rd+Rd);
+Zo=rd;
+Zi=Rg;
+printf("(a)Av = %0.2f\n(b)Zo = %0.0f k-ohms\n(c)Zi = %0.0f M-ohms",Av,Zo,Zi);
+
+// Result
+// (a) Av = 18.75
+// (b) Zo = 5 K-ohms
+// (c) Zi = 1 M-ohms
+\ No newline at end of file
diff --git a/181/CH7/EX7.28/example7_28.txt b/181/CH7/EX7.28/example7_28.txt
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+(a)Av = 18.75
+(b)Zo = 5 k-ohms
+(c)Zi = 1 M-ohms 
+\ No newline at end of file