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+{
+ "metadata": {
+  "name": "Chapter_18"
+ }, 
+ "nbformat": 2, 
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "markdown", 
+     "source": [
+      "<h1>Chapter 18: Programmable Analog Arrays<h1>"
+     ]
+    }, 
+    {
+     "cell_type": "markdown", 
+     "source": [
+      "<h3>Example 18.1, Page Number: 588<h3>"
+     ]
+    }, 
+    {
+     "cell_type": "code", 
+     "collapsed": false, 
+     "input": [
+      "", 
+      "import math", 
+      "#Variable declaration", 
+      "C=1000*10**-12;    #Switche capacitor value in farads", 
+      "R=1000;            #resistance in ohms", 
+      "", 
+      "#calculation", 
+      "T=R*C;    #Time period", 
+      "f=1/T;    #Frequency at which switch should operate", 
+      "f=math.ceil(f)", 
+      "#Result", 
+      "print('Frequency at which each switch should operate(in hertz) is \\n %d' %f)", 
+      "print('Duty cycle should be 50%')"
+     ], 
+     "language": "python", 
+     "outputs": [
+      {
+       "output_type": "stream", 
+       "stream": "stdout", 
+       "text": [
+        "Frequency at which each switch should operate(in hertz) is ", 
+        " 1000000", 
+        "Duty cycle should be 50%"
+       ]
+      }
+     ], 
+     "prompt_number": 1
+    }
+   ]
+  }
+ ]
+}
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