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{
"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
}
|
