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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:35cefa1a4ef186a1d32cec5eab7cbcc5a59aadb0b75b7fb4053796fe08e1ae51"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter -6 Digitally Controlled Frequency Synthesizers"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.1 - Page 180"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from numpy import pi\n",
+      "import math\n",
+      "from fractions import Fraction \n",
+      "# Given data\n",
+      "R1= 15*10**3 # in \u03a9\n",
+      "C1= 0.01*10**-6 # in F\n",
+      "C2= 10*10**-6 # in F\n",
+      "R2= 3.6*10**3 # in \u03a9\n",
+      "Vpos= 12 # in V\n",
+      "Vneg= -12 # in V\n",
+      "f_out= 1.2/(4*R1*C1) # free running frequency in Hz\n",
+      "f_out= f_out*10**-3 # in kHz\n",
+      "print \"The free running frequency = %0.f kHz\" %f_out \n",
+      "f_L= 8*f_out/(Vpos-(Vneg)) #Lock-range in kHz\n",
+      "print \"Lock-range of the circuit = \u00b1 \", Fraction(f_L).limit_denominator(100), \"kHz\" \n",
+      "f_L= f_L*10**3 # in Hz\n",
+      "f_C= math.sqrt(f_L/(2*pi*R2*C2)) # Hz\n",
+      "print \"Capture-range of the circuit = \u00b1 %0.2f Hz\" %f_C"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The free running frequency = 2 kHz\n",
+        "Lock-range of the circuit = \u00b1  2/3 kHz\n",
+        "Capture-range of the circuit = \u00b1 54.29 Hz\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.2 - Page 185"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Given data\n",
+      "f_out_max= 200 # in kHz\n",
+      "f_lowest= 1 # in Hz\n",
+      "# Frequency of reference oscillator,\n",
+      "f_ref_os= 2.2*f_out_max # in kHz\n",
+      "print \"The frequency of reference oscillator = %0.f kHz\" %f_ref_os\n",
+      "# Formula used : f_lowest= f_ref_os/2**n\n",
+      "n= round(math.log(f_ref_os*10**3/f_lowest, 10)/math.log(2,10))\n",
+      "print a\n",
+      "print \"The number of bits required = %0.f\" %n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The frequency of reference oscillator = 440 kHz\n",
+        "19.0\n",
+        "The number of bits required = 19\n"
+       ]
+      }
+     ],
+     "prompt_number": 26
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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