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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 10 - Negative Feedback Amplifiers"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## PageNumber 467 example 1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "reverse transmission   =   0.10\n",
+      "gain with feedback   =   10.00\n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "av=1000#\n",
+    "chvoga=0.001##change in voltage gain\n",
+    "beta1=1/((chvoga)/(100/av))-1#\n",
+    "beta1=beta1/av#\n",
+    "fegain=(av)/(1+(av*(beta1)))#\n",
+    "print \"reverse transmission   =   %0.2f\"%((beta1))\n",
+    "print \"gain with feedback   =   %0.2f\"%((fegain))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## PageNumber 467 example 2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "output voltage   =   2.19\n",
+      "input voltage   =   0.25 volt\n"
+     ]
+    }
+   ],
+   "source": [
+    "voltag=36##volt\n",
+    "w=0.07##harmonic distortion\n",
+    "inpvol=0.028##volt\n",
+    "beta1=0.012#\n",
+    "a=voltag/inpvol#\n",
+    "fegain=a/(1+beta1*a)##correction in book\n",
+    "volta1=fegain*inpvol#\n",
+    "print \"output voltage   =   %0.2f\"%((volta1))\n",
+    "#decrease of gain 9\n",
+    "inpvol=9*inpvol#\n",
+    "print \"input voltage   =   %0.2f\"%((inpvol)),\"volt\"#"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## PageNumber 468 example 3"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "required input   =   1.00 volt\n",
+      "harmonic distortion   =   0.10\n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "volgain=2000##voltage gain\n",
+    "outpower=20##watts\n",
+    "inpsig=10*10**-3##volts\n",
+    "fedbac=40##decibel\n",
+    "fedgai=volgain/100#\n",
+    "outvol=volgain*inpsig##output voltage\n",
+    "inpvol=outvol/fedgai##required input\n",
+    "#10 second harmonic distortion\n",
+    "distor=(10/100)#\n",
+    "print \"required input   =   %0.2f\"%((inpvol)),\"volt\"#\n",
+    "print \"harmonic distortion   =   %0.2f\"%((distor))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## PageNumber 469 example 5"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "feedback factor   =   0.019\n",
+      "over gain   =   0.005\n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "fedgai=60##decibel\n",
+    "outimp=10*10**3##ohm\n",
+    "outim1=500##ohm modified impedance\n",
+    "fedgai=1000#\n",
+    "fedbac=((outimp/outim1)-(1))/fedgai#\n",
+    "#10 change in gain\n",
+    "overga=1/((1+(fedgai*fedbac))/0.1)##over gain\n",
+    "print \"feedback factor   =   %0.3f\"%((fedbac))\n",
+    "print \"over gain   =   %0.3f\"%((overga))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## PageNumber 470 example 6"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "current gain   =   -11.60\n",
+      "voltage gain   =   -46.40\n",
+      "transconductance   =   -0.01 ampere per volt\n",
+      "transresistance   =   -46403.71 ohm\n",
+      "input resistance   =   1042.65 ohm\n",
+      "output resistance   =   3636.36 ohm\n"
+     ]
+    }
+   ],
+   "source": [
+    "colres=4*10**3##ohm\n",
+    "r=4*10**3##ohm\n",
+    "basres=20*10**3##ohm\n",
+    "r1=1*10**3##ohm\n",
+    "hie=1.1*10**3#\n",
+    "hfe=50#\n",
+    "hoe=(40*10**3)#\n",
+    "ri=basres*hie/(basres+hie)#\n",
+    "curgai=((r1/(r1+ri)))*((basres/(basres+hie)))*((-hfe*colres)/(colres+r))#\n",
+    "volgai=curgai*r/r1#\n",
+    "tranco=volgai/r#\n",
+    "tranre=r1*volgai#\n",
+    "outres=hoe*colres/(hoe+colres)#\n",
+    "print \"current gain   =   %0.2f\"%((curgai))\n",
+    "print \"voltage gain   =   %0.2f\"%((volgai))\n",
+    "print \"transconductance   =   %0.2f\"%((tranco)),\"ampere per volt\"#\n",
+    "print \"transresistance   =   %0.2f\"%((tranre)),\"ohm\"#\n",
+    "print \"input resistance   =   %0.2f\"%((ri)),\"ohm\"#\n",
+    "print \"output resistance   =   %0.2f\"%((outres)),\"ohm\"#"
+   ]
+  }
+ ],
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+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "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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