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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 4: Comparators and Controls"
]
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 4.1 Page No 88"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"Vsat = 14.0 #Saturation Voltage\n",
"R1 = 1000.0 \n",
"R2 = 100.0 #Load resistances\n",
"\n",
"#Calculation\n",
"Vut = (R2/(R1*R2))*Vsat\n",
"\n",
"#Result\n",
"print\" Value of Upper Threshold Voltage = \",Vut*1000,\"mV\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Value of Upper Threshold Voltage = 14.0 mV\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 4.2 Page No 88"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"Vsat = -13.0 #Saturation Voltage\n",
"R1 = 1000.0\n",
"R2 = 100.0 #Load resistances\n",
"\n",
"#Calculation\n",
"Vlt = (R2/(R1*R2))*Vsat\n",
"\n",
"#Result\n",
"print\" Value of Lower Threshold Voltage = \",Vlt*1000,\"mV\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Value of Lower Threshold Voltage = -13.0 mV\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 4.4 Page No 94"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"Vut = 12.0\n",
"Vlt = 8.0 #Upper and Lower Threshold Voltages \n",
"Vsatp = 15.0\n",
"Vsatm = -15.0 # Saturation Voltages\n",
"R = 10*10**3 #Choosing R\n",
"\n",
"#Calculation\n",
"Vh = Vut - Vlt # Hysteresis Voltage \n",
"Vctr = (Vut + Vlt)/2.0 #Center Voltage\n",
"n = (Vsatp - Vsatm)/Vh # Resistor Factor\n",
"Vref = Vctr / (1 + (1/n)) #Reference Voltage\n",
"Resistance = n * R\n",
"\n",
"#Result\n",
"print\" Center Voltage = \", Vctr ,\"V\"\n",
"print\" Resistor Factor = \" , n \n",
"print\" Reference Voltage = \", round(Vref,2)\n",
"print\" Feedback resistor is \", Resistance"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Center Voltage = 10.0 V\n",
" Resistor Factor = 7.5\n",
" Reference Voltage = 8.82\n",
" Feedback resistor is 75000.0\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 4.5 Page No 95"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"Vsatp = 15.0\n",
"Vsatm = -15.0 # Saturation Voltages\n",
"Vh = 4.0 #Hysteresis Voltage\n",
"Vctr = 10.0 #Center voltage\n",
"\n",
"#Calculation\n",
"n = ((Vsatp - Vsatm)/Vh)-1 \n",
"R = 10*10**3 #Input Resistance\n",
"Vref = ((n + 1)*(Vctr))/n # Reference Voltage\n",
"Resistance = n * R # Feedback Resistance\n",
"\n",
"#Result\n",
"print\" Resistance Factor = \", n\n",
"print\" Reference Voltage = \", round(Vref,2),\"V\"\n",
"print\" Feedback Resistance = \", Resistance/1000,\"kohm\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Resistance Factor = 6.5\n",
" Reference Voltage = 11.54 V\n",
" Feedback Resistance = 65.0 kohm\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 4.6 Page No 98"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"Vut = 13.5\n",
"Vlt = 10.5 #Upper and Lower Threshold Voltages\n",
"Vref = -15 # Reference Voltage\n",
"Vsatp = 13.0\n",
"Vsatm = -13.0 #Saturation Voltages \n",
"R = 10*10**3 # Input Resistance\n",
"\n",
"#Calculation\n",
"Vctr = (Vut + Vlt)/2.0\n",
"Vh = Vut - Vlt \n",
"m = -(Vref / Vctr)\n",
"Resistance = m * R \n",
"n = (Vsatp-Vsatm)/Vh \n",
"Resistance1 = n * R \n",
"\n",
"#Result\n",
"print\" Hysteresis Voltage = \", Vh \n",
"print\" Center Voltage = \", Vctr \n",
"print\" Resistor mR = \", Resistance/1000,\"kohm\"\n",
"print\" Resistor nR = \", round(Resistance1/1000,2),\"kohm\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Hysteresis Voltage = 3.0\n",
" Center Voltage = 12.0\n",
" Resistor mR = 12.5 kohm\n",
" Resistor nR = 86.67 kohm\n"
]
}
],
"prompt_number": 6
}
],
"metadata": {}
}
]
}
|
