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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 8 - FET Amplifier"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## PageNumber 399 example 1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "voltage gain   =   -12.00\n",
+      "voltage gain   =   -11.99\n"
+     ]
+    }
+   ],
+   "source": [
+    "from math import sqrt\n",
+    "freque=5*10**3##hertz\n",
+    "#(1)\n",
+    "g=2*10**-3##ampere per volt\n",
+    "rd=10*10**3##ohm\n",
+    "r1=30*10**3##ohm\n",
+    "r12=r1*r1/(r1+r1)\n",
+    "volgai=-(g*r12*rd)/(r12+rd)\n",
+    "print \"voltage gain   =   %0.2f\"%((volgai))\n",
+    "#correction : r12 should be taken as 15*10**3ohm in book\n",
+    "#(2) capacitance included\n",
+    "c=0.025*10**-6##farad\n",
+    "frequ1=1/((2*3.14*(((rd*r1)/(rd+r1))+r1))*c)\n",
+    "volgai=(volgai/(sqrt((1+(frequ1/freque)**2))))\n",
+    "\n",
+    "print \"voltage gain   =   %0.2f\"%((volgai))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## PageNumber 400 example 2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "voltage gain   -18.00\n"
+     ]
+    }
+   ],
+   "source": [
+    "rd=80*10**3##ohm\n",
+    "r1=8*10**3##ohm\n",
+    "rd12=5*10**3##ohm\n",
+    "rd1=rd*r1/(rd+r1)\n",
+    "u=30\n",
+    "volgai=-(u*rd1)/(rd1+rd12)\n",
+    "\n",
+    "print \"voltage gain   %0.2f\"%((volgai))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## PageNumber 401 example 3"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "voltage gain   =   -1.18\n"
+     ]
+    }
+   ],
+   "source": [
+    "r1=60*10**3##ohm\n",
+    "volgai=-17.7\n",
+    "rg=80*10**3##ohm\n",
+    "volgai=((volgai*rg)/(1-volgai))/((rg/(1-volgai))+r1)\n",
+    "print \"voltage gain   =   %0.2f\"%((volgai))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## PageNumber 405 example 6"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "r1   =   500.00 ohm\n",
+      "effective input resistance   =   1.25 r3ohm\n",
+      "r2   =   1500.00 ohm\n",
+      "voltage gain   =   0.98 av`\n"
+     ]
+    }
+   ],
+   "source": [
+    "vds=14##volt\n",
+    "idq=3*10**-3##ampere\n",
+    "vdd=20##volt\n",
+    "g=2*10**-2\n",
+    "rd=50*10**3##ohm\n",
+    "vgs=-1.5##volt\n",
+    "w=(vdd-vds)/idq\n",
+    "r1=-vgs/idq\n",
+    "r2=w-r1\n",
+    "inpres=1/(1-(0.8*((r1)/(r1+r2))))\n",
+    "volgai=(r1+r2)/(r1+r2+(1/(g)))\n",
+    "print \"r1   =   %0.2f\"%((r1)),\"ohm\"\n",
+    "print \"effective input resistance   =   %0.2f\"%((inpres)),\"r3ohm\"\n",
+    "print \"r2   =   %0.2f\"%((r2)),\"ohm\"\n",
+    "\n",
+    "\n",
+    "print \"voltage gain   =   %0.2f\"%((volgai)),\"av`\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## PageNumber 405 example 7"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "output voltage   =   -186.17 volt\n"
+     ]
+    }
+   ],
+   "source": [
+    "rg=40*10**3##ohm\n",
+    "voltag=(1-6*50)*3.3*10**3/(5.3*10**3)\n",
+    "\n",
+    "print \"output voltage   =   %0.2f\"%((voltag)),\"volt\"#\n",
+    "#correction required in the book"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## PageNumber 406 example 9"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "voltage gain   =   -25.00\n",
+      "frequency   =   1.59e+07 hertz\n",
+      "output capacitance   =   2.00e-12 farad\n",
+      "req   =   5000.00 ohm\n"
+     ]
+    }
+   ],
+   "source": [
+    "u=50\n",
+    "rd=10*10**3##ohm\n",
+    "cgs=5*10**-12##farad\n",
+    "cgd=2*10**-12##farad\n",
+    "cds=2*10**-12##farad\n",
+    "freque=3##decibel\n",
+    "g=u/rd\n",
+    "volgai=-u*rd/(rd+rd)\n",
+    "req=rd*rd/(rd+rd)\n",
+    "frequ1=1/(2*3.14*cgd*req)\n",
+    "print \"voltage gain   =   %0.2f\"%((volgai))\n",
+    "#correction required in book\n",
+    "print \"frequency   =   %0.2e\"%((frequ1)),\"hertz\"\n",
+    "capac1=cgd*(1+g)\n",
+    "print \"output capacitance   =   %0.2e\"%((capac1)),\"farad\"\n",
+    "print \"req   =   %0.2f\"%((req)),\"ohm\"\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
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+}