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  {

   "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": {}

  }

 ]

}