{
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"name": ""
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"CHAPTER 20 LINEAR OP-AMP CIRCUITS"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20-1, Page 741"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"Rf=100.0 #feedback path resistance Rf (KOhm)\n",
"R1=100.0 #inverting input resistance R1(KOhm)\n",
"R2=1.0 #inverting input & drain resistance R2(KOhm)\n",
"\n",
"Av1=(Rf/(R1**-1+R2**-1)**-1)+1 #maximum voltage gain\n",
"Av2=(Rf/R1)+1 #minimum voltage gain\n",
"\n",
"print 'maximum voltage gain = ',Av1\n",
"print 'minimum voltage gain = ',Av2"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"maximum voltage gain = 102.0\n",
"minimum voltage gain = 2.0\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20-2, Page 747"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"R1=1.2 #inverting input resistance R1(KOhm)\n",
"R2=91.0 #feedback resistance R2(KOhm)\n",
"\n",
"Av1=-R2/R1 #maximum voltage gain\n",
"Av2=0 #minimum voltage gain\n",
"\n",
"print 'maximum voltage gain = ',round(Av1,2)\n",
"print 'minimum voltage gain = ',Av2"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"maximum voltage gain = -75.83\n",
"minimum voltage gain = 0\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20-3, Page 747"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"R=1.5 #inverting input resistance R1(KOhm)\n",
"nR=7.5 #feedback resistance(KOhm)\n",
"\n",
"n=nR/R #max. limit of voltage gain \n",
"rf=nR/(n-1) #fixed resistor (KOhm)\n",
"\n",
"print 'maximum positive voltage gain = ',n\n",
"print 'other fixed resistor = ',rf,'KOhm'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"maximum positive voltage gain = 5.0\n",
"other fixed resistor = 1.875 KOhm\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20-4, Page 757"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"R1=1.0 #inverting input resistance R1(KOhm)\n",
"R2=100.0 #feedback resistance R2(KOhm)\n",
"R=10.0 #resistor of opamp in seconnd stage(KOhm)\n",
"Vin=10*10**-3 #input voltage(V)\n",
"Vin_CM=10 #common mode input voltage(V)\n",
"T=0.0001 #tolerance of resistor \n",
"\n",
"Av=(R2/R1)+1 #preamp voltage gain\n",
"Av_CM=2*T #common mode voltage gain of 2nd stage\n",
"Vout=-Av*Vin #output siganl voltage(V)\n",
"Vout_CM=Av_CM*Vin_CM #output siganl voltage for common mode signal(V)\n",
"\n",
"print 'output siganl voltage for common mode signal Vout(CM) = ',Vout_CM,'V'\n",
"print 'output siganl voltage Vout = ',Vout,'V'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"output siganl voltage for common mode signal Vout(CM) = 0.002 V\n",
"output siganl voltage Vout = -1.01 V\n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20-5, Page 759"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"Rf=6.0 #feedback path resistance Rf (KOhm)\n",
"R1=1.0 #inverting input resistance R1(KOhm)\n",
"R2=2.0 #inverting input resistance R2(KOhm)\n",
"R3=3.0 #non-inverting input resistance R3(KOhm)\n",
"R4=4.0 #non-inverting input resistance R4(KOhm)\n",
"R5=5.0 #non-inverting input resistance R5(KOhm)\n",
"\n",
"Av1=(-Rf/R1) #voltage gain1\n",
"Av2=(-Rf/R2) #voltage gain2\n",
"Av3=(1+(Rf/((R1**-1+R2**-1)**-1)))*(((R4**-1+R5**-1)**-1)/(R3+((R4**-1+R5**-1)**-1))) #voltage gain3\n",
"Av4=(1+(Rf/((R1**-1+R2**-1)**-1)))*(((R3**-1+R5**-1)**-1)/(R4+((R3**-1+R5**-1)**-1))) #voltage gain4\n",
"\n",
"print 'Voltage gain channel-1 Av1 = ',Av1\n",
"print 'Voltage gain channel-2 Av2 = ',Av2\n",
"print 'Voltage gain channel-3 Av3 = ',round(Av3,2)\n",
"print 'Voltage gain channel-4 Av4 = ',round(Av4,2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Voltage gain channel-1 Av1 = -6.0\n",
"Voltage gain channel-2 Av2 = -3.0\n",
"Voltage gain channel-3 Av3 = 4.26\n",
"Voltage gain channel-4 Av4 = 3.19\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20-6, Page 762"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"D0=1 #digital input0 (binary)\n",
"D1=0 #digital input1 (binary)\n",
"D2=0 #digital input2 (binary)\n",
"D3=1 #digital input3 (binary)\n",
"Vref=5 #reference voltage(V)\n",
"N=4 #no. of inputs\n",
"\n",
"BIN=(D0*2**0)+(D1*2**1)+(D2*2**2)+(D3*2**3) #decimal equivalent BIN\n",
"Vout=-((2*Vref*BIN)/2.0**N) #output voltage of converter(V)\n",
"\n",
"print 'decimal equivalent BIN = ',BIN\n",
"print 'output voltage of converter Vout = ',Vout,'V'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"decimal equivalent BIN = 9\n",
"output voltage of converter Vout = -5.625 V\n"
]
}
],
"prompt_number": 16
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20-7, Page 764"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"R2=51 #feedback path resistance (KOhm)\n",
"R1=1 #inverting input resistance R1(KOhm)\n",
"Bdc=125 #current gain\n",
"Zout=75 #open loop output impedance(Ohm)\n",
"AVOL=100000 #741C voltage gain\n",
"\n",
"Av=-R2/R1 #closed loop voltage gain\n",
"B=R1/(R1+R2) #feedback fraction\n",
"Zout_CL=Zout/(1+(AVOL*B)) #closed loop output impedance(Ohm)\n",
"Isc=25.0/1000 #shorted current for 741C op-amp(A)\n",
"Imax=Bdc*Isc #maximum load current(A)\n",
"\n",
"print 'closed loop output impedance Zout(CL) = ',Zout_CL,'Ohm'\n",
"print 'maximum load current Imax = ',Imax,'A'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"closed loop output impedance Zout(CL) = 75 Ohm\n",
"maximum load current Imax = 3.125 A\n"
]
}
],
"prompt_number": 23
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20-8, Page 768"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"Vin=1.0 #input voltage(V)\n",
"VCC=15 #supply voltage(V)\n",
"R=10 #inverting input resistance(KOhm)\n",
"Vin2=10.0 #larger input(V)\n",
"\n",
"iout=Vin/R #output current(mA)\n",
"RL_max=R*(VCC/Vin2-1) #Maximum load resistance(KOhm) \n",
"\n",
"print 'Output current iout = ',iout,'mA'\n",
"print 'Maximum load resistance RL(max) = ',RL_max,'KOhm'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Output current iout = 0.1 mA\n",
"Maximum load resistance RL(max) = 5.0 KOhm\n"
]
}
],
"prompt_number": 25
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20-9, Page 768"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"Vin=3.0 #input voltage(V)\n",
"VCC=15 #supply voltage(V)\n",
"R=15 #inverting input resistance(KOhm)\n",
"Vin2=12.0 #larger input(V)\n",
"\n",
"iout=-Vin/R #output current(mA)\n",
"RL_max=(R/2.0)*(VCC/Vin2-1) #Maximum load resistance(KOhm) \n",
"\n",
"print 'Output current iout = ',iout,'mA'\n",
"print 'Maximum load resistance RL(max) = ',RL_max,'KOhm'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Output current iout = -0.2 mA\n",
"Maximum load resistance RL(max) = 1.875 KOhm\n"
]
}
],
"prompt_number": 32
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20-10, Page 771"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"R2=47 #feedback path resistance (KOhm)\n",
"R1=1.0 #inverting input resistance R1(KOhm)\n",
"R3=100 #non-inverting input resistance R3(KOhm)\n",
"rds1=0.050 #ohmic resistance of JFET (KOhm)\n",
"rds2=120.0 #ohmic resistance of JFET (KOhm)\n",
"\n",
"Av1=((R2/R1)+1)*(rds1/(rds1+R3)) #minimum voltage gain\n",
"Av2=((R2/R1)+1)*(rds2/(rds2+R3)) #maximum voltage gain\n",
"\n",
"print 'Maximum voltage gain Av = ',round(Av2,2)\n",
"print 'Minimum voltage gain Av = ',round(Av1,3)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Maximum voltage gain Av = 26.18\n",
"Minimum voltage gain Av = 0.024\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}