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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:9248ce0e9925b4b2a2db19b4a563a9dcd0c2615021a9c00f051f93b7c452821b"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter02:Operational Amplifiers"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex2.1:pg-72"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Example 2.1 : Closed loop and open loop gain\n",
+      "# Consider inverting configuration\n",
+      "\n",
+      "# 2.1a\n",
+      "R_1=1000.0; # (ohm)\n",
+      "R_2=100*10.0**3; # (ohm)\n",
+      "A=10**3; # (V/V)\n",
+      "print A,\"= A (V/V)\"\n",
+      "G=-R_2/R_1/(1+(1+R_2/R_1)/A);\n",
+      "print round(-G,2),\"= G\"\n",
+      "e=(-G-(R_2/R_1))/(R_2/R_1)*100;\n",
+      "print round(e,2),\"= e (%)\"\n",
+      "v_1=0.1; # (V)\n",
+      "v_1=G*v_1/A;\n",
+      "print round(v_1*1000,2),\"= v_1 (mV)\"\n",
+      "A=10**4; # (V/V)\n",
+      "print A,\"= A (V/V)\"\n",
+      "G=-R_2/R_1/(1+(1+R_2/R_1)/A);\n",
+      "print round(-G,2),\"= G\"\n",
+      "e=(-G-(R_2/R_1))/(R_2/R_1)*100;\n",
+      "print round(e,2),\"= e (%)\"\n",
+      "v_1=0.1; # (V)\n",
+      "v_1=G*v_1/A;\n",
+      "print round(v_1*1000,3),\"= v_1 (mV)\"\n",
+      "A=10**5; # (V/V)\n",
+      "print A,\"= A (V/V)\"\n",
+      "G=-R_2/R_1/(1+(1+R_2/R_1)/A);\n",
+      "print round(-G,2),\"= G\"\n",
+      "e=(-G-(R_2/R_1))/(R_2/R_1)*100;\n",
+      "print round(e,2),\"= e (%)\"\n",
+      "v_1=0.1; # (V)\n",
+      "v_1=G*v_1/A;\n",
+      "print round(v_1*1000,3),\"= v_1 (mV)\"\n",
+      "\n",
+      "# 2.1b\n",
+      "A=50000; # (V/V)\n",
+      "print A,\"= A (V/V)\"\n",
+      "G=-R_2/R_1/(1+(1+R_2/R_1)/A);\n",
+      "print round(-G,2),\"= G\"\n",
+      "print \"Thus a -50% change in the open loop gain results in only -0.1% in the closed loop gain\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "1000 = A (V/V)\n",
+        "90.83 = G\n",
+        "-9.17 = e (%)\n",
+        "-9.08 = v_1 (mV)\n",
+        "10000 = A (V/V)\n",
+        "99.0 = G\n",
+        "-1.0 = e (%)\n",
+        "-0.99 = v_1 (mV)\n",
+        "100000 = A (V/V)\n",
+        "99.9 = G\n",
+        "-0.1 = e (%)\n",
+        "-0.1 = v_1 (mV)\n",
+        "50000 = A (V/V)\n",
+        "99.8 = G\n",
+        "Thus a -50% change in the open loop gain results in only -0.1% in the closed loop gain\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex2.3:pg-88"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Example 2.3 : Design instrumentation amplifier\n",
+      "R_2=1-50000-1/1000.0+50;\n",
+      "print round(-R_2/1000.0,1),\"= R_2 (Kohm)\"\n",
+      "R_1=-2*R_2/999;\n",
+      "print round(R_1),\"= R_1 (ohm)\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "49.9 = R_2 (Kohm)\n",
+        "100.0 = R_1 (ohm)\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file