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@@ -1,103 +0,0 @@
-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:e62a104ff81010a41974070c37970149915a1689606735dc017583e29241aaa5"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Chapter19-PN-Junction Diode"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Ex1-pg571"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "import math\n",
-      "##Example 19.1\n",
-      "##calculation of potential barrier\n",
-      "\n",
-      "##given values\n",
-      "e=1.6*10**-19.;\n",
-      "n=4.4*10**28.;##no of atoms per m**3\n",
-      "kT=.026*e;##temp eqvlnt at room temp\n",
-      "ni=2.4*10**19.;##no of intrinsic carriers per m**3\n",
-      "NA=n/10**6.;##no of acceptors\n",
-      "ND=n/10**6.;##no of donors\n",
-      "\n",
-      "##calculation\n",
-      "V=(kT/e)*math.log(NA*ND/ni**2);\n",
-      "print'%s %.2f %s'%('potential barrier in volts is',V,'');\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "potential barrier in volts is 0.39 \n"
-       ]
-      }
-     ],
-     "prompt_number": 1
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Ex2-pg578"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "import math\n",
-      "##Example 19.2\n",
-      "##calculation of current\n",
-      "\n",
-      "##given values\n",
-      "e=1.6*10**-19.;\n",
-      "kT=.026*e;##temp eqvlnt at room temp\n",
-      "Io=2*10**-7;##current flowing at room temp in A\n",
-      "V=.1;##forward bias voltage in volts\n",
-      "\n",
-      "##calculation\n",
-      "I=Io*(math.e**(e*V/kT)-1);##in Ampere\n",
-      "print'%s %.2f %s'%('current flowing when forward bias applied(in microampere)is',I*10**6,'');\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "current flowing when forward bias applied(in microampere)is 9.16 \n"
-       ]
-      }
-     ],
-     "prompt_number": 2
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file