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+{
+ "cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "# Chapter 11 Digital To Analog Converter(D/A Converter)"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 11.1 Pg 313"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 1,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "the full scale voltage of D/A converter VFS is = 24.00 V \n"
+ ]
+ }
+ ],
+ "source": [
+ "from __future__ import division\n",
+ "from math import sqrt, pi\n",
+ "# to determine the full scale voltage of D/A\n",
+ "Vref = 12 #\n",
+ "Rf = 10 # # K ohm\n",
+ "R = 5 # # K ohm\n",
+ "\n",
+ "# the full scale voltage of D/A converter \n",
+ "VFS = Vref*(Rf/R) #\n",
+ "print 'the full scale voltage of D/A converter VFS is = %0.2f'%VFS,' V '"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 11.2 Pg 313"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 2,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "For BI 10101010 the output of D/A converter is = 2.04 V \n",
+ "For BI 11001100 the output of D/A converter is = 2.448 V \n",
+ "For BI 11101110 the output of D/A converter is = 2.856 V \n",
+ "For BI 00010001 the output of D/A converter is = 0.204 V \n"
+ ]
+ }
+ ],
+ "source": [
+ " # determine the output voltage of D/A converter for the binary inputs a) 10101010 b) 11001100 c) 11101110 d) 00010001 \n",
+ "Del = 12*10**-3 # # mA\n",
+ "\n",
+ "# the input voltage of D/A converter \n",
+ " #Vo = Del*binary input (BI)\n",
+ "\n",
+ "# For BI 10101010 the output\n",
+ "BI = '10101010' #\n",
+ "BI = int(BI,2)#\n",
+ "Vo = Del*BI #\n",
+ "print 'For BI 10101010 the output of D/A converter is = ',Vo,' V '\n",
+ "\n",
+ "# For BI 11001100 the output\n",
+ "BI = '11001100' #\n",
+ "BI = int(BI,2)#\n",
+ "Vo = Del*BI #\n",
+ "print 'For BI 11001100 the output of D/A converter is = ',Vo,' V '\n",
+ "\n",
+ "# For BI 11101110 the output\n",
+ "BI = '11101110' #\n",
+ "BI = int(BI,2)#\n",
+ "Vo = Del*BI #\n",
+ "print 'For BI 11101110 the output of D/A converter is = ',Vo,' V '\n",
+ "\n",
+ "# For BI 00010001 the output\n",
+ "BI = '00010001' #\n",
+ "BI = int(BI,2)#\n",
+ "Vo = Del*BI #\n",
+ "print 'For BI 00010001 the output of D/A converter is = ',Vo,' V '"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 11.3 Pg 314"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 3,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "the resolution of 4-bit D/A converter is = 0.80 V \n"
+ ]
+ }
+ ],
+ "source": [
+ "# determine the resolution of 4-bit D/A converter\n",
+ "VFS = 12.0 #\n",
+ "N = 4.0 #\n",
+ "\n",
+ "# the resolution of 4-bit D/A converter is defined as\n",
+ "Resolution = VFS/(2**N-1) #\n",
+ "print 'the resolution of 4-bit D/A converter is = %0.2f'%Resolution,' V '"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 11.4 314"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 4,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "the number of bit required to design a 4-bit D/A converter is = 8.97 = 9 \n"
+ ]
+ }
+ ],
+ "source": [
+ "from __future__ import division\n",
+ "from math import log10\n",
+ "# determine the number of bit required to design a 4-bit D/A converter\n",
+ "VFS = 5 #\n",
+ "Resolution = 10*10**-3 # # A\n",
+ "\n",
+ "# the resolution of 4-bit D/A converter is defined as\n",
+ "# Resolution = VFS/(2**N-1) #\n",
+ "N = (VFS/Resolution)+1 # \n",
+ "N = log10(N)/log10(2)#\n",
+ "print 'the number of bit required to design a 4-bit D/A converter is = %0.2f'%N,' = 9 '"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 11.5 Pg 315"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 5,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "for the binary input 101 analog output is = -60.00 V \n",
+ "for the binary input 111 analog output is = -84.00 V \n",
+ "for the binary input 011 analog output is = -72.00 V \n",
+ "for the binary input 001 analog output is = -48.00 V \n",
+ "for the binary input 100 analog output is = -12.00 V\n"
+ ]
+ }
+ ],
+ "source": [
+ "# determine the analog output voltage\n",
+ "Vref = 12 # \n",
+ "BI = 101 # BI = 111 # BI = 011 # BI = 001 # BI = 100 #\n",
+ "Rf = 40*10**3 #\n",
+ "R = 0.25*Rf #\n",
+ "\n",
+ "# The output voltage of given binary weighted resistor D/A converter is defined as\n",
+ "\n",
+ "# Vo = -(Rf*Vref/R)*(2**0*b0+2**-1*b1+2**-2*b2) #\n",
+ "\n",
+ "# Vo = -(Rf*Vref/R)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "\n",
+ "# for the given value Rf,R and Vref the output voltage\n",
+ "\n",
+ "# Vo = -48*(b0+2**-1*b1+2**-2*b2) #\n",
+ "\n",
+ "# for the binary input 101 analog output is\n",
+ "b2 = 1 #\n",
+ "b1 = 0 #\n",
+ "b0 = 1 #\n",
+ "Vo = -48*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 101 analog output is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "\n",
+ "# for the binary input 111 analog output is\n",
+ "b2 = 1 #\n",
+ "b1 = 1 #\n",
+ "b0 = 1 #\n",
+ "Vo = -48*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 111 analog output is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "\n",
+ "# for the binary input 011 analog output is\n",
+ "b2 = 0 #\n",
+ "b1 = 1 #\n",
+ "b0 = 1 #\n",
+ "Vo = -48*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 011 analog output is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "\n",
+ "# for the binary input 001 analog output is\n",
+ "b2 = 0 #\n",
+ "b1 = 0 #\n",
+ "b0 = 1 #\n",
+ "Vo = -48*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 001 analog output is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "\n",
+ "# for the binary input 100 analog output is\n",
+ "b2 = 1 #\n",
+ "b1 = 0 #\n",
+ "b0 = 0 #\n",
+ "Vo = -48*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 100 analog output is = %0.2f'%Vo,' V'"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 11.6 Pg 316"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 6,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "for the binary input 1001 analog output is = -67.50 V \n",
+ "the feedback current If is = 2.70 mA \n",
+ "for the binary input 1101 analog output is = -82.50 V \n",
+ "the feedback current If is = 3.30 mA \n",
+ "for the binary input 1010 analog output is = -37.50 V \n",
+ "the feedback current If is = 1.50 mA \n",
+ "for the binary input 0011 analog output is = -90.00 V \n",
+ "the feedback current If is = 3.60 mA \n"
+ ]
+ }
+ ],
+ "source": [
+ "# determine the analog output voltage and feed back current If\n",
+ "Vref = 12 # \n",
+ "BI = 1001 # BI = 1101 # BI = 1010 # BI = 0011 #\n",
+ "Rf = 25 # # K ohm\n",
+ "R = 0.25*Rf #\n",
+ "\n",
+ "# The output voltage of given binary weighted resistor D/A converter is defined as\n",
+ "\n",
+ "# Vo = -(Rf*Vref/R)*(2**0*b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "\n",
+ "# Vo = -(Rf*Vref/R)*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "\n",
+ "# for the given value Rf,R and Vref the output voltage\n",
+ "\n",
+ "# Vo = -60*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "\n",
+ "# for the binary input 1001 analog output is\n",
+ "b3 = 1 #\n",
+ "b2 = 0 #\n",
+ "b1 = 0 #\n",
+ "b0 = 1 #\n",
+ "Vo = -60*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "print 'for the binary input 1001 analog output is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "# the feedback current If is given by\n",
+ "If = -(Vo/Rf) #\n",
+ "print 'the feedback current If is = %0.2f'%If,' mA '\n",
+ "\n",
+ "\n",
+ "# for the binary input 1101 analog output is\n",
+ "b3 = 1 #\n",
+ "b2 = 1 #\n",
+ "b1 = 0 #\n",
+ "b0 = 1 #\n",
+ "Vo = -60*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "print 'for the binary input 1101 analog output is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "# the feedback current If is given by\n",
+ "If = -(Vo/Rf) #\n",
+ "print 'the feedback current If is = %0.2f'%If,' mA '\n",
+ "\n",
+ "\n",
+ "# for the binary input 1010 analog output is\n",
+ "b3 = 1 #\n",
+ "b2 = 0 #\n",
+ "b1 = 1 #\n",
+ "b0 = 0 #\n",
+ "Vo = -60*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "print 'for the binary input 1010 analog output is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "# the feedback current If is given by\n",
+ "If = -(Vo/Rf) #\n",
+ "print 'the feedback current If is = %0.2f'%If,' mA '\n",
+ "\n",
+ "\n",
+ "# for the binary input 0011 analog output is\n",
+ "b3 = 0 #\n",
+ "b2 = 0 #\n",
+ "b1 = 1 #\n",
+ "b0 = 1 #\n",
+ "Vo = -60*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "print 'for the binary input 0011 analog output is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "# the feedback current If is given by\n",
+ "If = -(Vo/Rf) #\n",
+ "print 'the feedback current If is = %0.2f'%If,' mA '"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 11.7 Pg 319"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 7,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "for the binary input 001 analog output is = 1.60 mA \n",
+ "An analog output voltage Vo is = -40.00 V \n",
+ "for the binary input 010 analog output is = 0.80 mA\n",
+ "An analog output voltage Vo is = -20.00 V \n",
+ "for the binary input 110 analog output is = 1.20 mA \n",
+ "An analog output voltage Vo is = -30.00 V \n"
+ ]
+ }
+ ],
+ "source": [
+ "# determine the feed back current If and analog output voltage\n",
+ "Vref = 8 # # V\n",
+ "BI = 001 #\n",
+ "BI = 010 #\n",
+ "BI = 110 #\n",
+ "Rf = 25*10**3 # # Hz\n",
+ "R = 0.2*Rf #\n",
+ "\n",
+ "# The output current of given binary weighted resistor D/A converter is defined as\n",
+ "\n",
+ "# If = -(Vref/R)*(2**0*b0+2**-1*b1+2**-2*b2) #\n",
+ "\n",
+ "# If = -(Vref/R)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "\n",
+ "# for the given value Rf,R and Vref the output current\n",
+ "\n",
+ "# If = -(1.6*10**-3)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "\n",
+ "# for the binary input 001 the feedback current If is given by\n",
+ "b2 = 0 #\n",
+ "b1 = 0 #\n",
+ "b0 = 1 #\n",
+ "If = (1.6*10**-3)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 001 analog output is = %0.2f'%(If*1000),' mA '\n",
+ "\n",
+ "# An analog output voltage Vo is\n",
+ "Vo = -If*Rf #\n",
+ "print 'An analog output voltage Vo is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "\n",
+ "# for the binary input 010 the feedback current If is given by\n",
+ "b2 = 0 #\n",
+ "b1 = 1 #\n",
+ "b0 = 0 #\n",
+ "If = (1.6*10**-3)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 010 analog output is = %0.2f'%(If*1000),' mA'\n",
+ "\n",
+ "# the An analog output voltage Vo is\n",
+ "Vo = -If*Rf #\n",
+ "print 'An analog output voltage Vo is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "\n",
+ "# for the binary input 110 the feedback current If is given by\n",
+ "b2 = 1 #\n",
+ "b1 = 1 #\n",
+ "b0 = 0 #\n",
+ "If = (1.6*10**-3)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 110 analog output is = %0.2f'%(If*1000),' mA '\n",
+ "\n",
+ "# the An analog output voltage Vo is\n",
+ "Vo = -If*Rf #\n",
+ "print 'An analog output voltage Vo is = %0.2f'%Vo,' V '"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 11.8 Pg 320"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 8,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "for the binary input 101 analog output is = 0.625 mA \n",
+ "An analog output voltage Vo is = -15.625 V \n",
+ "for the binary input 011 analog output is = 0.75 mA\n",
+ "An analog output voltage Vo is = -18.750 V \n",
+ "for the binary input 100 analog output is = 0.125 mA \n",
+ "An analog output voltage Vo is = -3.12 V \n",
+ "for the binary input 001 analog output is = 0.5 mA \n",
+ "An analog output voltage Vo is = -12.50 V \n"
+ ]
+ }
+ ],
+ "source": [
+ "from __future__ import division\n",
+ "# determine the feed back current If and analog output voltage\n",
+ "Vref = 5 # \n",
+ "BI = 101 # BI = 011 # BI = 100 # BI = 001 #\n",
+ "Rf = 25*10**3 # \n",
+ "R = 0.2*Rf #\n",
+ "\n",
+ "# The output current of given R-2R ladder D/A converter is defined as\n",
+ "\n",
+ "# If = -(Vref/2*R)*(2**0*b0+2**-1*b1+2**-2*b2) #\n",
+ "\n",
+ "# If = -(Vref/2*R)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "\n",
+ "# for the given value Rf,R and Vref the output current\n",
+ "\n",
+ "# If = (0.5*10**-3)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "\n",
+ "# for the binary input 101 the feedback current If is given by\n",
+ "b2 = 1 #\n",
+ "b1 = 0 #\n",
+ "b0 = 1 #\n",
+ "If = (0.5*10**-3)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 101 analog output is = %0.3f'%(If*1e3),' mA '\n",
+ "\n",
+ "# An analog output voltage Vo is\n",
+ "Vo = -If*Rf #\n",
+ "print 'An analog output voltage Vo is = %0.3f'%Vo,' V '\n",
+ "\n",
+ "\n",
+ "# for the binary input 011 the feedback current If is given by\n",
+ "b2 = 0 #\n",
+ "b1 = 1 #\n",
+ "b0 = 1 #\n",
+ "If = (0.5*10**-3)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 011 analog output is = %0.2f'%(If*1e3),' mA'\n",
+ "\n",
+ "# the An analog output voltage Vo is\n",
+ "Vo = -If*Rf #\n",
+ "print 'An analog output voltage Vo is = %0.3f'%Vo,' V '\n",
+ "\n",
+ "\n",
+ "# for the binary input 100 the feedback current If is given by\n",
+ "b2 = 1 #\n",
+ "b1 = 0 #\n",
+ "b0 = 0 #\n",
+ "If = (0.5*10**-3)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 100 analog output is = %0.3f'%(If*1e3),'mA '\n",
+ "\n",
+ "# the An analog output voltage Vo is\n",
+ "Vo = -If*Rf #\n",
+ "print 'An analog output voltage Vo is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "# for the binary input 001 the feedback current If is given by\n",
+ "b2 = 0 #\n",
+ "b1 = 0 #\n",
+ "b0 = 1 #\n",
+ "If = (0.5*10**-3)*(b0+2**-1*b1+2**-2*b2) #\n",
+ "print 'for the binary input 001 analog output is = %0.1f'%(If*1e3),' mA '\n",
+ "\n",
+ "# the An analog output voltage Vo is\n",
+ "Vo = -If*Rf #\n",
+ "print 'An analog output voltage Vo is = %0.2f'%Vo,' V '"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 11.9 Pg 322"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 9,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "for the binary input 1001 analog output is = -14.0625 V \n",
+ "the feedback current If is = 0.28 mA \n",
+ "for the binary input 1100 analog output is = -4.6875 V \n",
+ "the feedback current If is = 0.09 mA \n",
+ "for the binary input 1010 analog output is = -7.8125 V \n",
+ "the feedback current If is = 0.16 mA \n",
+ "for the binary input 0011 analog output is = -18.75 V \n",
+ "the feedback current If is = 0.375 mA \n"
+ ]
+ }
+ ],
+ "source": [
+ " # determine the analog output voltage and feed back current If\n",
+ "Vref = 10 # \n",
+ "BI = 1001 # BI = 1100 # BI = 1010 # BI = 0011 #\n",
+ "Rf = 50 # # K ohm\n",
+ "R = 0.4*Rf #\n",
+ "\n",
+ "# The output voltage of given R-2R ladder D/A converter is defined as\n",
+ "\n",
+ "# Vo = -(Rf*Vref/2R)*(2**0*b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "\n",
+ "# Vo = -(Rf*Vref/2R)*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "\n",
+ "# for the given value Rf,R and Vref the output voltage\n",
+ "\n",
+ "# Vo = -12.5*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "\n",
+ "# for the binary input 1001 analog output is\n",
+ "b3 = 1 #\n",
+ "b2 = 0 #\n",
+ "b1 = 0 #\n",
+ "b0 = 1 #\n",
+ "Vo = -12.5*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "print 'for the binary input 1001 analog output is = %0.4f'%Vo,' V '\n",
+ "\n",
+ "# the feedback current If is given by\n",
+ "If = -(Vo/Rf) #\n",
+ "print 'the feedback current If is = %0.2f'%If,' mA '\n",
+ "\n",
+ "\n",
+ "# for the binary input 1100 analog output is\n",
+ "b3 = 1 #\n",
+ "b2 = 1 #\n",
+ "b1 = 0 #\n",
+ "b0 = 0 #\n",
+ "Vo = -12.5*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "print 'for the binary input 1100 analog output is = %0.4f'%Vo,' V '\n",
+ "\n",
+ "# the feedback current If is given by\n",
+ "If = -(Vo/Rf) #\n",
+ "print 'the feedback current If is = %0.2f'%If,' mA '\n",
+ "\n",
+ "\n",
+ "# for the binary input 1010 analog output is\n",
+ "b3 = 1 #\n",
+ "b2 = 0 #\n",
+ "b1 = 1 #\n",
+ "b0 = 0 #\n",
+ "Vo = -12.5*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "print 'for the binary input 1010 analog output is = %0.4f'%Vo,' V '\n",
+ "\n",
+ "# the feedback current If is given by\n",
+ "If = -(Vo/Rf) #\n",
+ "print 'the feedback current If is = %0.2f'%If,' mA '\n",
+ "\n",
+ "\n",
+ "# for the binary input 0011 analog output is\n",
+ "b3 = 0 #\n",
+ "b2 = 0 #\n",
+ "b1 = 1 #\n",
+ "b0 = 1 #\n",
+ "Vo = -12.5*(b0+2**-1*b1+2**-2*b2+2**-3*b3) #\n",
+ "print 'for the binary input 0011 analog output is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "# the feedback current If is given by\n",
+ "If = -(Vo/Rf) #\n",
+ "print 'the feedback current If is = %0.3f'%If,' mA '"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 11.10 Pg 324"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 10,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "for the binary input 1000 output voltage is = 18.75 V \n",
+ "the feedback current If is = -0.469 mA \n"
+ ]
+ }
+ ],
+ "source": [
+ " # determine the analog output voltage and feed back current If\n",
+ "Vref = 15 # \n",
+ "BI = 1000 #\n",
+ "Rf = 40 # # K ohm\n",
+ "R = 0.4*Rf #\n",
+ "\n",
+ "# by using voltage divider rule Vin can be calculated as\n",
+ "Vin = -(Vref*2*R)/(2*R+2*R) #\n",
+ " \n",
+ "# The output voltage of given R-2R ladder D/A converter is defined as\n",
+ "\n",
+ "# Vo = -(Rf*Vin/R)\n",
+ "\n",
+ "Vo = (Vref*Rf)/(2*R)\n",
+ "print 'for the binary input 1000 output voltage is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "# the feedback current If is given by\n",
+ "If = -(Vo/Rf) #\n",
+ "print 'the feedback current If is = %0.3f'%If,' mA '"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 11.11 Pg 326"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 11,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "For the BI 10101111 output analog voltage is = 6.86 V \n",
+ "For the BI 11100010 output analog voltage is = 8.8627 V \n",
+ "For the BI 00101001 output analog voltage is = 1.6078 V \n",
+ "For the BI 01000110 output analog voltage is = 2.745 V \n"
+ ]
+ }
+ ],
+ "source": [
+ "from __future__ import division\n",
+ "# to find the resolution and analog output voltage of 8-bit D/A converter\n",
+ "VFS = 10 #\n",
+ "N = 8 #\n",
+ "BI = 10101111 #\n",
+ "BI = 11100011 # \n",
+ "BI = 00101001 #\n",
+ "BI = 01000110\n",
+ "\n",
+ "# the resolution of 8-bit D/A converter is defined as\n",
+ "Resolution = VFS/(2**N-1) #\n",
+ "\n",
+ "# An analog output voltage of D/A converter is given by\n",
+ "# Vo = Resolution*(2**-0*b0+2**-1*b1+....+2**-N*bn-1)\n",
+ "# Vo = Resolution*(2**-0*b0+2**-1*b1+2**-2*b2+2**-3*b3+2**-4*b4+2**-5*b5+2**-6*b6+2**-7*b7)#\n",
+ "\n",
+ "# For the BI 10101111 output analog voltage is\n",
+ "BI = '10101111'#\n",
+ "BI = int(BI,2)#\n",
+ "Vo = Resolution*BI #\n",
+ "print 'For the BI 10101111 output analog voltage is = %0.2f'%Vo,' V '\n",
+ "\n",
+ "# For the BI 11100010 output analog voltage is\n",
+ "BI = '11100010'#\n",
+ "BI = int(BI,2)#\n",
+ "Vo = Resolution*BI #\n",
+ "print 'For the BI 11100010 output analog voltage is = %0.4f'%Vo,' V '\n",
+ "\n",
+ "# For the BI 00101001 output analog voltage is\n",
+ "BI = '00101001'#\n",
+ "BI = int(BI,2)#\n",
+ "Vo = Resolution*BI #\n",
+ "print 'For the BI 00101001 output analog voltage is = %0.4f'%Vo,' V '\n",
+ "\n",
+ "# For the BI 01000110 output analog voltage is\n",
+ "BI = '01000110'#\n",
+ "BI = int(BI,2)#\n",
+ "Vo = Resolution*BI #\n",
+ "print 'For the BI 01000110 output analog voltage is = %0.3f'%Vo,' V '"
+ ]
+ }
+ ],
+ "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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