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diff --git a/Electronic_Devices_and_Circuits/Chapter8_2.ipynb b/Electronic_Devices_and_Circuits/Chapter8_2.ipynb
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-{

- "metadata": {

-  "name": ""

- },

- "nbformat": 3,

- "nbformat_minor": 0,

- "worksheets": [

-  {

-   "cells": [

-    {

-     "cell_type": "heading",

-     "level": 1,

-     "metadata": {},

-     "source": [

-      "Chapter 08 : BJT specifications and performance"

-     ]

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.2, Page No 313"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "#initialisation of variables\n",

-      "P2=25.0*10**-3#when frequency increase to 20KHz\n",

-      "P1=50.0*10**-3#when signal frequency is 5KHz\n",

-      "\n",

-      "#Calculations\n",

-      "Po=10*math.log((P2/P1),10)\n",

-      "\n",

-      "#Results\n",

-      "print(\" output power change in decibels is %.2f dB \" %Po)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        " output power change in decibels is -3.01 dB \n"

-       ]

-      }

-     ],

-     "prompt_number": 1

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.3, Page No 314"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "\n",

-      "#initialisation of variables\n",

-      "v1=1# output voltage measured at 5KHz\n",

-      "v2=.707# output voltage measure at 20kHz\n",

-      "\n",

-      "#Calculations\n",

-      "Po=20*math.log((v2/v1),10)\n",

-      "\n",

-      "#Results\n",

-      "print(\" output power change is %.2f dB \" %Po)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        " output power change is -3.01 dB \n"

-       ]

-      }

-     ],

-     "prompt_number": 2

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.4 Page No 317"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "\n",

-      "#initialisation of variables\n",

-      "Ic=1.0*10**-3\n",

-      "hfe=50.0\n",

-      "hie=1.3*10**3\n",

-      "fT=250.0*10**6\n",

-      "Cbc=5.0*10**-12\n",

-      "Rc=8.2*10**3\n",

-      "Rl=100.0*10**3\n",

-      "\n",

-      "#Calculations\n",

-      "Ie=Ic\n",

-      "Av=(hfe*((Rc*Rl)/(Rc+Rl)))/hie\n",

-      "Cbe=(6.1*Ie)/fT\n",

-      "Cin=(Cbe+(1+Av)*Cbc)*10**9\n",

-      "\n",

-      "#Results\n",

-      "print(\" input capacitance when the circuit operated as CE is %.2fnF \"%Cin)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        " input capacitance when the circuit operated as CE is 1.49nF \n"

-       ]

-      }

-     ],

-     "prompt_number": 3

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.5, Page No 319"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "#initialisation of variables\n",

-      "R1=100*10**3\n",

-      "R2=47.0*10**3\n",

-      "Re=4.7*10**3\n",

-      "Cbc=5.0*10**-12\n",

-      "Cbe=24.4*10**-12\n",

-      "hfe=50\n",

-      "hie=1.3*10**3\n",

-      "hib=24.5\n",

-      "rs=hib\n",

-      "rs=600.0\n",

-      "\n",

-      "#Calculations\n",

-      "print(\" common emitter circuit\")\n",

-      "Rb=(R1*R2)/(R1+R2)\n",

-      "Zi=(Rb*hie)/(Rb+hie)\n",

-      "Cin=1.48*10**-9\n",

-      "f2=1/(2*3.14*Cin*((rs*Zi)/(rs+Zi)))\n",

-      "print(\"input-capacitance upper cutoff frequency is %dHz \" %f2)\n",

-      "print(\"common base circuit\")\n",

-      "Zi=(Re*hib)/(Re+hib)\n",

-      "Cin=(Cbe+Cbc)\n",

-      "f2=(1/(2*3.14*Cin*((rs*Zi)/(rs+Zi))))*10**-6\n",

-      "\n",

-      "#Results\n",

-      "print(\" input capacitance upper cutoff when operating as CB circuit with base bypassed to ground is %.2f MHz \" %f2)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        " common emitter circuit\n",

-        "input-capacitance upper cutoff frequency is 265447Hz \n",

-        "common base circuit\n",

-        " input capacitance upper cutoff when operating as CB circuit with base bypassed to ground is 231.25 MHz \n"

-       ]

-      }

-     ],

-     "prompt_number": 4

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.6 Page No 322"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "#initialisation of variables\n",

-      "fT=50.0*10**6\n",

-      "hfe=50.0\n",

-      "f2o=60.0*10**3\n",

-      "Rc=10.0*10**3\n",

-      "\n",

-      "#Calculations\n",

-      "fae=fT/hfe\n",

-      "C4=(1.0/(2*3.14*f2o*Rc))*10**12\n",

-      "\n",

-      "#Results\n",

-      "print(\"capacitance required for C4 to give 60kHz upper cutoff frequency is %.2f pF \" %C4)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "capacitance required for C4 to give 60kHz upper cutoff frequency is 265.39 pF \n"

-       ]

-      }

-     ],

-     "prompt_number": 5

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.8 Page No 326"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "\n",

-      "#initialisation of variables\n",

-      "ton=100.0*10**-9\n",

-      "Rs=600.0\n",

-      "Rb=4.7*10**3\n",

-      "\n",

-      "#Calculations\n",

-      "C1=(ton/Rs)*10**12\n",

-      "print(\" suitable speed up capacitor is %dpF \" %C1)\n",

-      "C1=160*10**-12#standard value\n",

-      "PWmin=(5*Rs*C1)\n",

-      "SWmin=5*Rb*C1\n",

-      "fmax=1/(PWmin+SWmin)\n",

-      "\n",

-      "#Results\n",

-      "print(\"maximum signal frequency is %.2f Hz \" %(fmax/1000))"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        " suitable speed up capacitor is 166pF \n",

-        "maximum signal frequency is 235.85 Hz \n"

-       ]

-      }

-     ],

-     "prompt_number": 6

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.9, Page No 330"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "#initialisation of variables\n",

-      "R1=30.0*10**3\n",

-      "R2=30.0*10**3\n",

-      "rs=30.0*10**3\n",

-      "f2=40.0*10**3\n",

-      "f1=100.0\n",

-      "k=1.37*10**-23\n",

-      "R=10.0*10**3\n",

-      "Av=600.0\n",

-      "Ri=3.0*10**3\n",

-      "\n",

-      "#Calculations\n",

-      "Rb=(R1*R2)/(R1+R2)\n",

-      "Rg=(rs*Rb)/(rs+Rb)\n",

-      "T=(273+25)\n",

-      "B=f2-f1\n",

-      "en=math.sqrt(4*k*T*B*R)\n",

-      "eni=en*((Ri/(Ri+Rg)))\n",

-      "eno=(Av*eni)*10**6\n",

-      "\n",

-      "#Results\n",

-      "print(\"noise output voltage is %.2f uV \" %eno)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "noise output voltage is 353.44 uV \n"

-       ]

-      }

-     ],

-     "prompt_number": 7

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.10 Page No 331"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math \n",

-      "\n",

-      "#initialisation of variables\n",

-      "Ic=30.0*10**-6\n",

-      "Vce=5.0\n",

-      "eno=354.0*10**-6\n",

-      "NF=10.0\n",

-      "F=2.51#F=antilog(NF/10)\n",

-      "\n",

-      "#Calculations\n",

-      "Vn=((math.sqrt(F))*eno)*10**6\n",

-      "\n",

-      "#Results\n",

-      "print(\"total noise output volateg for amplifier is %.2f uV \" %Vn)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "total noise output volateg for amplifier is 560.84 uV \n"

-       ]

-      }

-     ],

-     "prompt_number": 8

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.11 Page No 333"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "#initialisation of variables\n",

-      "Pd25=625.0*10**-3\n",

-      "D=5.0*10**-3\n",

-      "Vce=10.0\n",

-      "T2=55.0\n",

-      "\n",

-      "#Calculations\n",

-      "Pdt2=Pd25-D*(T2-25)\n",

-      "Pd=Pdt2\n",

-      "Ic=Pd/Vce\n",

-      "\n",

-      "#Results\n",

-      "print(\" maximum Ic level is %.2fA \" %(Ic*1000))\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        " maximum Ic level is 47.50A \n"

-       ]

-      }

-     ],

-     "prompt_number": 9

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.13 Page No 335"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "\n",

-      "#initialisation of variables\n",

-      "Pd=80.0\n",

-      "Vce=60.0\n",

-      "\n",

-      "#Calculations\n",

-      "Ic=Pd/Vce\n",

-      "print(\"point 1 Vce=60 and Ic= %.2f A\" %Ic)\n",

-      "Vce=40.0\n",

-      "Ic=Pd/Vce\n",

-      "print(\"point 2 Vce=40 and  Ic= %.2f A\" %Ic)\n",

-      "Vce=20.0\n",

-      "Ic=Pd/Vce\n",

-      "print(\" point 3 Vce=20 and  Ic= %.2f A\" %Ic)\n",

-      "Vce=10.0\n",

-      "Ic=Pd/Vce\n",

-      "\n",

-      "#Results\n",

-      "print(\" point 4 Vce=10 and  Ic= %.2f A\" %Ic)\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "point 1 Vce=60 and Ic= 1.33 A\n",

-        "point 2 Vce=40 and  Ic= 2.00 A\n",

-        " point 3 Vce=20 and  Ic= 4.00 A\n",

-        " point 4 Vce=10 and  Ic= 8.00 A\n"

-       ]

-      }

-     ],

-     "prompt_number": 10

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 8.14, Page No 339"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "\n",

-      "#initialisation of variables\n",

-      "Vce=20.0\n",

-      "Ic=1.0\n",

-      "T2=90.0\n",

-      "T1=25.0\n",

-      "\n",

-      "#Calculations\n",

-      "Q=Vce*Ic\n",

-      "Qcs=.4\n",

-      "Qjc=1#from table\n",

-      "Qsa=((T2-T1)/Q)-(Qjc+Qcs)\n",

-      "\n",

-      "#Results\n",

-      "print(\"Qsa= %.2f \" %Qsa)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "Qsa= 1.85 \n"

-       ]

-      }

-     ],

-     "prompt_number": 11

-    }

-   ],

-   "metadata": {}

-  }

- ]

-}
\ No newline at end of file