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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:268207babca50d59c46d454ea7ce41b37f6eaad8a022bc43c98526f17a497ebd"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "chapter 4 Amplitude Modulator and Demodulator circuits"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.1 Page no 129"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#given\n",
+      "\n",
+      "Vcc =48\n",
+      "I = 3.5\n",
+      "efficiency =70                           #percent\n",
+      "modulation = 67                          #percent\n",
+      "m = modulation/100.0\n",
+      "#calculation\n",
+      "\n",
+      "Pi = Vcc*I\n",
+      "Pc=Pi\n",
+      "Pm = Pi/2.0\n",
+      "Pout = (efficiency*Pi)/100.0\n",
+      "Ps = Pc*((m**2)/4.0)\n",
+      "maximum_swing = 2*Vcc \n",
+      "#Result\n",
+      "\n",
+      "print \"(a) RF input power to the output stage is \",Pi,\"W\"\n",
+      "print \"(b) AF power required for 100 percent modulation is \",Pm,\"W\"\n",
+      "print \"(c) Carrier output power is \",Pout,\"W\"\n",
+      "print \"(d) Power in one sideband for 67 percent modulation is \",round(Ps,2),\"W\"\n",
+      "print \"(e) maximum and minimum dc supply voltage swing with 100 percent modulation is \",maximum_swing,\"V\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "(a) RF input power to the output stage is  168.0 W\n",
+        "(b) AF power required for 100 percent modulation is  84.0 W\n",
+        "(c) Carrier output power is  117.6 W\n",
+        "(d) Power in one sideband for 67 percent modulation is  18.85 W\n",
+        "(e) maximum and minimum dc supply voltage swing with 100 percent modulation is  96 V\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.2 Page no 145"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#given\n",
+      "\n",
+      "fc =4.2*10**6\n",
+      "f1 = 300\n",
+      "f2 = 3400\n",
+      "#calculation\n",
+      "#upper sideband\n",
+      "\n",
+      "x0=fc+f1\n",
+      "y0=fc+f2\n",
+      "#lower sideband\n",
+      "\n",
+      "x1=fc-f1\n",
+      "y1=fc-f2\n",
+      "frequency=(x1+y1)/2.0\n",
+      "#Result \n",
+      "\n",
+      "print \"(a) Upper sideband ranges from \",x0,\"to\",y0\n",
+      "print \"    lower sideband ranges from \",x1,\"to\",y1\n",
+      "print \"(b) approximate center frequency of a bandpass filter is \",frequency,\"Hz\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "(a) Upper sideband ranges from  4200300.0 to 4203400.0\n",
+        "    lower sideband ranges from  4199700.0 to 4196600.0\n",
+        "(b) approximate center frequency of a bandpass filter is  4198150.0 Hz\n"
+       ]
+      }
+     ],
+     "prompt_number": 29
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file