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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter No.2 : Operational Amplifier Fundamentals"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 2.1, Page No. 59"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Input bias and input offset current\n",
"\n",
"import math\n",
"#Variable declaration\n",
"Ib1 = 18*10**-6 # base current of transistor 1\n",
"Ib2 = 22*10**-6 # base current of transistor 2\n",
"\n",
"#Calculations\n",
"#(i)\n",
"Ib = (Ib1+Ib2)/2\n",
"#(ii)\n",
"Iios = abs(Ib1-Ib2)\n",
"\n",
"#Result\n",
"print(\"(i) Input bias current = %d micro-A\\n(ii) Input offset current = %.0f micro-A\"%(Ib*10**6,Iios*10**6))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(i) Input bias current = 20 micro-A\n",
"(ii) Input offset current = 4 micro-A\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 2.2, Page No. 65"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Maximum frequency of operation\n",
"\n",
"import math\n",
"#Variable declaration\n",
"Vin = 3.0 # input voltage\n",
"sr = 0.5*10**6 # slew rate in V/Sec\n",
"\n",
"#Calculations\n",
"Vm = Vin/2\n",
"fm = sr/(2*math.pi*Vm)\n",
"fm = fm /1000 \n",
"\n",
"#Result\n",
"print(\"Maximum frequency of operation is %.3f kHz\"%(math.floor(fm*1000)/1000))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Maximum frequency of operation is 53.051 kHz\n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 2.3, Page No. 65"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Slew rate \n",
"\n",
"import math\n",
"#Variable declaration\n",
"Icq = 15*10**-6 # Maximum op-amp current \n",
"C = 35*10**-12 # equivalent capacitance\n",
"V = 12.0 # input voltage \n",
"\n",
"#Calculations\n",
"S = Icq/C\n",
"S = S/10**6\n",
"\n",
"#Result\n",
"print(\"Slew rate = %.4f V/micro-sec\"%(math.floor(S*10**4)/10**4))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Slew rate = 0.4285 V/micro-sec\n"
]
}
],
"prompt_number": 15
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 2.4, Page No. 66"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Slew rate and maximum possible frequency of input\n",
"\n",
"import math\n",
"# Variable declaration\n",
"Icq = 10*10**-6 # maximum op-amp current\n",
"C = 33*10**-12 # equivalent capacitance\n",
"V = 12 # peak value of input voltage\n",
"\n",
"\n",
"#Calculations\n",
"S = Icq/C\n",
"fm = S/(2*math.pi*V)\n",
"\n",
"#Result\n",
"print(\"Slew rate = %.3f V/micro-sec\\nfm = %.3f kHz\"%(S/10**6,fm/1000))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Slew rate = 0.303 V/micro-sec\n",
"fm = 4.019 kHz\n"
]
}
],
"prompt_number": 20
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 2.5, Page No. 66"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Common mode rejection ratio(refere to fig 2.24)\n",
"\n",
"import math\n",
"#Variable declaration\n",
"R1 = 1000.0 # resistance 1\n",
"R2_1_E = 90000.0 # resistance R2(1-E)\n",
"R2 = 100000.0 # resistance R2\n",
"\n",
"#Calculations\n",
"Aid = R2/R1\n",
"E = 1-(R2_1_E/R2)\n",
"Acm = R2*E/(R1+R2)\n",
"CMRR = Aid/Acm\n",
"CMRR = 20*math.log10(CMRR)\n",
"\n",
"#Result\n",
"print(\"CMRR = %d dB\"%CMRR)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"CMRR = 60 dB\n"
]
}
],
"prompt_number": 2
}
],
"metadata": {}
}
]
}
|
