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diff --git a/Microelectronic_Circuits_by_A.S._Sedra_and_K.C._Smith/Chapter12.ipynb b/Microelectronic_Circuits_by_A.S._Sedra_and_K.C._Smith/Chapter12.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:0d870b040ee224c1f9fb208e7b24af7cd3362e9d307710cf1a001e89fa523e12"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter12:Filters and Tuned Amplifiers"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex12.4:pg-1143"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Example 12.4 To design tuned amplifier\n",
+      "\n",
+      "cfg=-10; # Center frequency gain (V/V)\n",
+      "g_m=0.005; # (A/V)\n",
+      "r_o=10000; # (ohm)\n",
+      "f_o=1*10**6; # (Hz)\n",
+      "B=2*math.pi*10**4; # Bandwidth\n",
+      "R=-cfg/g_m;\n",
+      "R_L=R*r_o/(r_o-R);\n",
+      "print R_L/1000,\"= R_L (kohm)\"\n",
+      "C=1/(R*B)\n",
+      "print round(C*1e12),\"= C (picoF)\"\n",
+      "w_o=2*math.pi*f_o;\n",
+      "L=1/(w_o**2*C);\n",
+      "print round(L*1e6,2),\"= L (microH)\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "2.5 = R_L (kohm)\n",
+        "7958.0 = C (picoF)\n",
+        "3.18 = L (microH)\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file