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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 21: Bipolar Transistors"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 21.1, Page 445"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Output Current, I = 2.04 mA\n",
+      "Output Voltage, V = 4.5 V\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "#Initialization\n",
+    "vcc=10                     #voltage\n",
+    "vbe=0.7                     #voltage, base-to-emitter junction\n",
+    "rb=910*10**3                #resistance in ohm\n",
+    "hfe=200\n",
+    "rc=2.7*10**3                 #resistance in ohm\n",
+    "\n",
+    "#Calculation\n",
+    "ib=(vcc-vbe)/rb               #base current in ampere\n",
+    "ic=hfe*ib                     #collector in current in ampere\n",
+    "vo=vcc-(ic*rc)                #output voltage\n",
+    "\n",
+    "#Result\n",
+    "print'Output Current, I = %.2f mA'%(ic*10**3)\n",
+    "print'Output Voltage, V = %.1f V'%vo"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 21.2, Page 445"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 25,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Quiescent Output Voltage, V = 5.6 V\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "#Initialization\n",
+    "vcc=10                     #voltage\n",
+    "r2=10*10**3                #resistance in ohm\n",
+    "r1=27*10**3                  #resistance in ohm\n",
+    "vbe=0.7                     #voltage, base-to-emitter junction\n",
+    "re=10**3                #resistance in ohm\n",
+    "rc=2.2*10**3                 #resistance in ohm\n",
+    "\n",
+    "#Calculation\n",
+    "vb=vcc*(r2*(r1+r2)**-1)                     # base voltage\n",
+    "ve=vb-vbe                           #emitter voltage\n",
+    "ie=ve/re                          #emitter current\n",
+    "ic=ie                           #collector current\n",
+    "vo=vcc-(ic*rc)                  #output voltage\n",
+    "\n",
+    "#Result\n",
+    "print'Quiescent Output Voltage, V = %.1f V'%vo\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 21.3, Page 448"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 16,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Voltage Gain = -2.2 mA\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "#Initialization\n",
+    "re=10**3                #resistance in ohm\n",
+    "rc=2.2*10**3                 #resistance in ohm\n",
+    "\n",
+    "#Calculation\n",
+    "gain=-rc/re                #voltage gain\n",
+    "\n",
+    "#Result\n",
+    "print'Voltage Gain = %.1f mA'%gain\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 21.4, Page 451"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 20,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Voltage Gain = 64 Hz\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "#Initialization\n",
+    "r1=15*10**3                #resistance in ohm\n",
+    "r2=47*10**3                 #resistance in ohm\n",
+    "C=220*10**-9                #capacitance in farad\n",
+    "\n",
+    "#Calculation\n",
+    "ri=(r1*r2)/(r1+r2)           #resistance in paraller\n",
+    "fco=1/(2*math.pi*C*ri)        #frequency in Hz\n",
+    "\n",
+    "\n",
+    "#Result\n",
+    "print'Voltage Gain = %d Hz'%round(fco)\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 21.5, Page 453"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 26,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Quiescent Output Voltage, V = 2.0 V\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "#Initialization\n",
+    "vcc=10                     #voltage\n",
+    "r2=10*10**3                #resistance in ohm\n",
+    "r1=27*10**3                  #resistance in ohm\n",
+    "vbe=0.7                     #voltage, base-to-emitter junction\n",
+    "re=10**3                #resistance in ohm\n",
+    "rc=2.2*10**3                 #resistance in ohm\n",
+    "\n",
+    "#Calculation\n",
+    "vb=vcc*(r2*(r1+r2)**-1)                     # base voltage\n",
+    "ve=vb-vbe                           #emitter voltage\n",
+    "\n",
+    "\n",
+    "#Result\n",
+    "print'Quiescent Output Voltage, V = %.1f V'%ve\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  }
+ ],
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+  "anaconda-cloud": {},
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+   "language": "python",
+   "name": "Python [Root]"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
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+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
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+}