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+// Calculate transconductance,amplification factor
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 7-20 in page 328
+
+clear; clc; close;
+
+// Given data
+Id=2*10^-3; // Drain current in mA
+Vgs=2; // Gate-source voltage in V
+Rd=200*10^3; // Drain resistance in K-ohms
+
+// Calculation
+gm=Id/Vgs;
+mu=gm*Rd;
+printf("(a)Transconductance gm = %0.0e A/V\n",gm);
+printf("(b)Amplification factor mu = %0.0f",mu);
+
+// Result
+// (a) gm = 1 mA/V
+// (b) mu = 200
+\ No newline at end of file
diff --git a/181/CH7/EX7.20/example7_20.txt b/181/CH7/EX7.20/example7_20.txt
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+(a)Transconductance gm = 1e-003 A/V
+(b)Amplification factor mu = 200 
+\ No newline at end of file