1 files changed, 175 insertions, 0 deletions
diff --git a/Electrical_and_Electronic_Systems_by_Neil_Storey/Chapter8.ipynb b/Electrical_and_Electronic_Systems_by_Neil_Storey/Chapter8.ipynb
new file mode 100644
index 00000000..bc1fdb59
--- /dev/null
+++ b/Electrical_and_Electronic_Systems_by_Neil_Storey/Chapter8.ipynb
@@ -0,0 +1,175 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 8: Operational Amplifier"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 8.3, Page 148"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Gain = 50\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Initialisation\n",
+    "f=20*10**3              #bandwidth frequency in KHz\n",
+    "\n",
+    "#Calculation\n",
+    "gain=(10**6)/(f)         #gain\n",
+    "\n",
+    "#Result\n",
+    "print'Gain = %d'%gain"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 8.4, Page 150"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false,
+    "scrolled": true
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Output Resistance = 7.5 mOhm\n",
+      "\n",
+      "Input Resistance = 20 GOhm\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Initialisation\n",
+    "og=2*10**5                          #Open Loop Gain\n",
+    "cg=20                              #Closed Loop Gain\n",
+    "or1=75                              #Output Resistance\n",
+    "ir1=2*10**6                          #Input Resistance\n",
+    "\n",
+    "#Calculation\n",
+    "ab=og*cg**-1                           #factor (1+AB)\n",
+    "or2=or1/ab                              #Output Resistance\n",
+    "ir2=ir1*ab                          #Input Resistance\n",
+    "\n",
+    "#Result\n",
+    "print'Output Resistance = %.1f mOhm\\n'%(or2*1000)\n",
+    "print'Input Resistance = %d GOhm'%(ir2*10**-9)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 8.5, Page 150"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Output Resistance = 7.5 mOhm\n",
+      "\n",
+      "Input Resistance = 1 KOhm\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Initialisation\n",
+    "og=2*10**5                          #Open Loop Gain\n",
+    "cg=20                               #Closed Loop Gain\n",
+    "or1=75                              #Output Resistance\n",
+    "ir1=2*10**6                         #Input Resistance\n",
+    "r1=20*10**3                         #Resistnce in Ohm\n",
+    "r2=10**3                            #Resistnce in Ohm\n",
+    "\n",
+    "#Calculation\n",
+    "ab=og*cg**-1                        #factor (1+AB)\n",
+    "or2=or1*ab**-1                          #Output Resistance\n",
+    "#the input is connected to a virtual earth point by the resistance R2, \n",
+    "#so the input resistance is equal to R 2 ,\n",
+    "ir2=r2                              #Input Resistance\n",
+    "\n",
+    "#Result\n",
+    "print'Output Resistance = %.1f mOhm\\n'%(or2*1000)\n",
+    "print'Input Resistance = %d KOhm'%(ir2*10**-3)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 8.6, Page 151"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Output Resistance = 375 uOhm\n",
+      "\n",
+      "Input Resistance = 400 GOhm\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Initialisation\n",
+    "og=2*10**5                          #Open Loop Gain\n",
+    "cg=1                              #Closed Loop Gain\n",
+    "or1=75                              #Output Resistance\n",
+    "ir1=2*10**6                          #Input Resistance\n",
+    "\n",
+    "#Calculation\n",
+    "ab=og*cg**-1                        #factor (1+AB)\n",
+    "or2=or1*ab**-1                      #Output Resistance\n",
+    "ir2=ir1*ab                          #Input Resistance\n",
+    "\n",
+    "#Result\n",
+    "print'Output Resistance = %d uOhm\\n'%(or2*10**6)       #wrong answer in the textbook\n",
+    "print'Input Resistance = %d GOhm'%(ir2*10**-9)"
+   ]
+  }
+ ],
+ "metadata": {},
+ "nbformat": 4,
+ "nbformat_minor": 0
+}