{
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter03 : Op-amp with negative feedback"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 3.1 : page 97"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# given data\n",
"R1=1.5 #in kohm\n",
"RF=15 #in kohm\n",
"A=2*10**5 #unitless\n",
"Ri=1 #in Mohm\n",
"Ro=75 #in ohm\n",
"fo=5 #in Hz\n",
"AF=1+RF/R1 #unitless\n",
"B=1/AF #unitless\n",
"RiF=(1+A*B)*Ri*10**6 #in ohm\n",
"RoF=Ro/(1+A*B) #in ohm\n",
"fF=fo*(1+A*B) #in ohm\n",
"print \"Close loop voltage gain AF = %0.2f \" %AF\n",
"print \"Value of RiF = %0.2e ohm\"%RiF\n",
"print \"Value of RoF = %0.2e ohm\"%RoF\n",
"print \"Value of fF = %0.f kHz\"%(fF/1000)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Close loop voltage gain AF = 11.00 \n",
"Value of RiF = 1.82e+10 ohm\n",
"Value of RoF = 4.12e-03 ohm\n",
"Value of fF = 91 kHz\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 3.2 : page 98"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"# given data\n",
"AF=100 #unitless\n",
"A=2*10**5 #unitless\n",
"Ri=1 #in Mohm\n",
"Ro=75 #in ohm\n",
"#let R1 =1 ohm\n",
"R1=1 #in ohm\n",
"#formula : AF=1+RF/R1\n",
"RF=(AF-1)*R1 #in kohm\n",
"B=1/AF #unitless\n",
"RiF=(1+A*B)*Ri*10**6 #in ohm\n",
"RoF=Ro/(1+A*B) #in ohm\n",
"print \"Value of RF = %0.2f kohm\"%RF\n",
"print \"Value of RiF = %0.2e ohm\"%RiF\n",
"print \"Value of RoF = %0.2e ohm\"%RoF"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Value of RiF = 99.00 kohm\n",
"Value of RiF = 2.00e+09 ohm\n",
"Value of RoF = 3.75e-02 ohm\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 3.3 : page 99"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# given data\n",
"AF=1 #unitless\n",
"B=1 #unitless\n",
"A=2*10**5 #unitless\n",
"fo=5 #in Hz\n",
"Ri=1 #in Mohm\n",
"Ro=75 #in ohm\n",
"#let 1+AB=A as A>>>1\n",
"RiF=A*Ri*10**6 #in ohm\n",
"RoF=Ro/A #in ohm\n",
"fF=fo*A #in ohm\n",
"print \"Value of RiF = %0.2e ohm\"%RiF\n",
"print \"Value of RoF = %0.2e ohm\"%RoF\n",
"print \"Value of fF = %0.2f MHz\"%(fF/10**6)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Value of RiF = 2.00e+11 ohm\n",
"Value of RoF = 3.75e-04 ohm\n",
"Value of fF = 1.00 MHz\n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 3.4 : page 103"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" # given data\n",
"R1=50 #in Kohm\n",
"AF=-6 #unitless\n",
"# here AF=-RF/R1\n",
"RF=-AF*R1 #in kohm\n",
"print \"Value of RF = %0.f kohm\" %RF"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Value of RF = 300 kohm\n"
]
}
],
"prompt_number": 13
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 3.5 : page 104"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"# given data\n",
"A=2*10**5 #unitless\n",
"Ri=1 #in Mohm\n",
"Ro=75 #in ohm\n",
"fo=5 #in Hz\n",
"R1=50 #in kohm\n",
"RF=300 #in kohm\n",
"K=RF/(R1+RF) #unitless\n",
"B=R1/(R1+RF) #unitless\n",
"AF=-(A*K/(1+A*B)) #unitless\n",
"RiF=R1 #in kohm ideal\n",
"RoF=Ro/(1+A*B) #in ohm\n",
"fF=-(A*K*fo/AF) #in Hz\n",
"print \"Close loop voltage gain AF = %0.2f\"%AF\n",
"print \"Value of RiF = %0.2f kohm\"%RiF\n",
"print \"Value of RoF = %0.2e ohm\"%RoF\n",
"print \"Value of fF = %0.f kHz\"%(fF/1000)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Close loop voltage gain AF = -6.00\n",
"Value of RiF = 50.00 kohm\n",
"Value of RoF = 2.62e-03 ohm\n",
"Value of fF = 143 kHz\n"
]
}
],
"prompt_number": 18
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 3.6 : page 107"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# given data\n",
"# let R1=R2=R3=R=10kohm\n",
"R=10 #in kohm\n",
"R1=R #in kohm\n",
"R2=R #in kohm\n",
"R3=R #in kohm\n",
"RF=3*R #in Kohm\n",
"print \"Value of RF = %0.0f kohm\"%RF"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Value of RF = 30 kohm\n"
]
}
],
"prompt_number": 19
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 3.7 : page 108"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" # given data\n",
"RF=1 #in Mohm\n",
"AV=-30 #unitless\n",
"#AV=-RF/R1=Vo/V1\n",
"R1=-RF*10**6/AV #in ohm\n",
"#for an inverting amplifier RiF=R1\n",
"RiF=R1 #in ohm\n",
"print \"Value of R1 = %0.2f kohm\"%(R1/1000)\n",
"print \"Value of RiF = %0.2f kohm\"%(RiF/1000)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Value of R1 = 33.33 kohm\n",
"Value of RiF = 33.33 kohm\n"
]
}
],
"prompt_number": 20
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 3.8 : page 108"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" # given data\n",
"AV=-8 #unitless\n",
"Vin=-1 #in Volts\n",
"Imax=15 #in uA\n",
"Vo=AV*Vin #in Volts\n",
"#Formula : Vo=Imax*R2min\n",
"R2min=Vo/(Imax*10**-6) #in kohm\n",
"R1min=-Vin/(Imax*10**-6) #in kohm\n",
"print \"Required value of R2 = %0.2f kohm\"%(R2min/1000)\n",
"print \"Required value of R1 = %0.2f kohm\"%(R1min/1000)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Required value of R2 = 533.33 kohm\n",
"Required value of R1 = 66.67 kohm\n"
]
}
],
"prompt_number": 21
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 3.9 : page 110"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" # given data\n",
"Vo=1.5 #in Volts\n",
"Vin=10 #in mVolts\n",
"RiF=500 #in kohm\n",
"R1=500 #in kohm\n",
"AF=Vo/(Vin*10**-3) #unitless\n",
"RF=AF*R1 #in Kohm\n",
"print \"The value of RF = %0.2f Mohm\"%(RF/1000)\n",
"#AF=-R2/R1*(1+R3/R2+R3/R4)\n",
"#Microphone resistance is Rm=1.2 Kohm\n",
"R1eff=100 #in Kohm\n",
"Rm=1.2 #in Kohm\n",
"R1=R1eff-Rm\n",
"R3=5*R1 \n",
"R2=R3 #in Kohm\n",
"R4=R3/28 #in Kohm\n",
"print \"Value of R1 = %0.2f kohm\" %R1\n",
"print \"Value of R2 = %0.2f kohm\" %R2\n",
"print \"Value of R3 = %0.2f kohm\" %R3\n",
"print \"Value of R4 = %0.2f kohm\" %R4"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The value of RF = 75.00 Mohm\n",
"Value of R1 = 98.80 kohm\n",
"Value of R2 = 494.00 kohm\n",
"Value of R3 = 494.00 kohm\n",
"Value of R4 = 17.64 kohm\n"
]
}
],
"prompt_number": 22
}
],
"metadata": {}
}
]
}