{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 14 Special Function ICs"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.1 Pg 415"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"the output voltage of the adjustable voltage regulator is = 22.25 V \n"
]
}
],
"source": [
"from __future__ import division\n",
"\n",
"# to determine the regulated voltage \n",
"R1 = 250 # #ohm \n",
"R2 = 2500 # # ohm \n",
"Vref = 2 # #V #reference voltage\n",
"Iadj = 100*10**-6# # A # adjacent current\n",
"\n",
"#the output voltage of the adjustable voltage regulator is defined by\n",
"Vo = (Vref*((R2/R1)+1)+(Iadj*R2)) #\n",
"print 'the output voltage of the adjustable voltage regulator is = %0.2f'%Vo,' V '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.2 Pg 416"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"the total power dissipation of the IC is = 25.00 mA \n"
]
}
],
"source": [
"# to determine the current drawn from the dual power supply \n",
"V = 10 # # V\n",
"P = 500 # # mW\n",
"\n",
"# we assume that each power supply provides half power supply to IC\n",
"P1 = (P/2)#\n",
"\n",
"# the total power dissipation of the IC\n",
"# P1 = V*I #\n",
"I = P1/V #\n",
"print 'the total power dissipation of the IC is = %0.2f'%I,' mA '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.3 Pg 416"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"the output voltage of the adjustable voltage regulator is = 7.50 V \n"
]
}
],
"source": [
"# to determine the output voltage \n",
"R1 = 100*10**3 # #ohm \n",
"R2 = 500*10**3 # # ohm \n",
"Vref = 1.25 # #V #reference voltage\n",
"\n",
"#the output voltage of the adjustable voltage regulator is defined by\n",
"Vo = Vref*(R1+R2)/R1#\n",
"print 'the output voltage of the adjustable voltage regulator is = %0.2f'%Vo,' V '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.4 Pg 417"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The output voltage of switching regulator circuit is = 3.50 V \n"
]
}
],
"source": [
"# determine the output voltage of the switching regulator circuit\n",
"d = 0.7 # # duty cycle\n",
"Vin = 5 # # V # input voltage\n",
"\n",
"# The output voltage of switching regulator circuit is given by\n",
"Vo = d*Vin #\n",
"print 'The output voltage of switching regulator circuit is = %0.2f'%Vo,' V '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.5 Pg 417"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The output voltage of switching regulator circuit is = 0.96 \n"
]
}
],
"source": [
"# determine the duty cycle of the switching regulator circuit\n",
"Vo = 4.8 # # V # output voltage\n",
"Vin = 5 # # V # input voltage\n",
"\n",
"# The output voltage of switching regulator circuit is given by\n",
"# Vo = d*Vin #\n",
"\n",
"# Duty cycle is given as\n",
"d =Vo/Vin #\n",
"print 'The output voltage of switching regulator circuit is = %0.2f'%d,' '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.6 Pg 418"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The output voltage of switching regulator circuit is = 0.50 \n"
]
}
],
"source": [
"# determine the duty cycle of the switching regulator circuit\n",
"T =120 # #msec # total pulse time\n",
"# T = ton + toff #\n",
"ton = T/2 #\n",
"\n",
"# The duty cycle of switching regulator circuit is given by\n",
"d = ton/T#\n",
"print 'The output voltage of switching regulator circuit is = %0.2f'%d,' '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.7 Pg 418"
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The output voltage of switching regulator circuit is = 0.67 \n"
]
}
],
"source": [
"# determine the duty cycle of the switching regulator circuit\n",
"ton = 12 # #msec # on time of pulse\n",
"# ton = 2*toff # given\n",
"# T = ton + toff #\n",
"toff = ton/2 #\n",
"T = ton+toff # # total time\n",
"\n",
"# The duty cycle of switching regulator circuit is given by\n",
"d = ton/T#\n",
"print 'The output voltage of switching regulator circuit is = %0.2f'%d,' '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.8 Pg 419"
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The emitter bias voltage is = 3.80 V \n",
"The output voltage of the IC LM380 is = 7.90 V \n"
]
}
],
"source": [
" # determine the output voltage of the audio power amplifier IC LM380\n",
"Vcc = 12 # # V\n",
"Ic3 = 12*10**-6 # # A # collector current of the transistor Q3\n",
"Ic4 = 12*10**-6 # # A # collector current of the transistor Q4\n",
"R11 = 25*10**3 # # ohm\n",
"R12 = 25*10**3 # # ohm\n",
"\n",
"# the collector current of Q3 is defined as\n",
" # Ic3 = (Vcc-3*Veb)/(R11+R12)#\n",
"Veb = (Vcc-(R11+R12)*Ic3)/3 #\n",
"print 'The emitter bias voltage is = %0.2f'%Veb,' V '\n",
"\n",
"# the output voltage of the IC LM380\n",
"Vo = (1/2)*Vcc+(1/2)*Veb#\n",
"print 'The output voltage of the IC LM380 is = %0.2f'%Vo,' V '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.9 Pg 420"
]
},
{
"cell_type": "code",
"execution_count": 10,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The emitter bias voltage is = 3.33 V \n",
"The output voltage of the IC LM380 is = 6.67 V \n"
]
}
],
"source": [
"# determine the output voltage of the audio power amplifier IC LM380\n",
"Vcc = 10 # # V\n",
"Ic3 = 0.01*10**-6 # # A # collector current of the transistor Q3\n",
"Ic4 = 0.01*10**-6 # # A # collector current of the transistor Q4\n",
"R11 = 25*10**3 # # ohm\n",
"R12 = 25*10**3 # # ohm\n",
"\n",
"# the collector current of Q3 is defined as\n",
" # Ic3 = (Vcc-3*Veb)/(R11+R12)#\n",
"Veb = (Vcc-(R11+R12)*Ic3)/3 #\n",
"print 'The emitter bias voltage is = %0.2f'%Veb,' V '\n",
"\n",
"# the output voltage of the IC LM380\n",
"Vo = (1/2)*Vcc+(1/2)*Veb#\n",
"print 'The output voltage of the IC LM380 is = %0.2f'%Vo,' V '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.10 Pg 421"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The emitter resistor of Q3 is = 52.00 ohm ( at temperature 25 degree celsius) \n",
"The trans conductance of transistor is = 38.5 mA/V \n",
"The base emitter resistor rbe is = 1.30 K ohm \n",
"The emitter capacitor Ce = 7.65 pF \n",
"The value of resistance RL is = 264.55 ohm \n",
"The pole frequency fa is = 601.91 M Hz \n",
"The pole frequency fb is = 1073.74 M Hz \n",
"The pole frequency fc is = 3060.67 M Hz \n",
"Hence fa is a dominant pole frequency \n"
]
}
],
"source": [
"from numpy import inf\n",
"from math import sqrt, pi\n",
"# Design a video amplifier of IC 1550 circuit\n",
"Vcc = 12 # # V\n",
"Av = -10 #\n",
"Vagc = 0 # # at bandwidth of 20 MHz\n",
"hfe = 50 # # forward emitter parameter\n",
"rbb = 25 # # ohm # base resistor\n",
"Cs = 1*10**-12 # # F # source capacitor\n",
"Cl = 1*10**-12 # # F # load capacitor\n",
"Ie1 = 1*10**-3 # # A # emitter current of Q1\n",
"f = 1000*10**6 # # Hz\n",
"fT = 800*10**6 # # Hz\n",
"Vt = 52*10**-3 #\n",
"Vt1 = 0.026 #\n",
"\n",
"# When Vagc =0 the transistor Q2 is cut-off and the collector current of transistor Q2 flow through the transistor Q3\n",
"# i.e Ic1=Ie1=Ie3\n",
"Ie3 = 1*10**-3 # # A # emitter current of Q3\n",
"Ic1 = 1*10**-3 # # A # collector current of the transistor Q1\n",
"\n",
"# it indicates that the emitter current of Q2 is zero Ie2 = 0 then the emitter resistor of Q2 is infinite\n",
"\n",
"re2 = inf #\n",
"\n",
"# emitter resistor of Q3 \n",
"re3 = (Vt/Ie1)#\n",
"print 'The emitter resistor of Q3 is = %0.2f'%re3,' ohm ( at temperature 25 degree celsius) '\n",
"\n",
"# the trans conductance of transistor is\n",
"gm = (Ie1/Vt1)#\n",
"print 'The trans conductance of transistor is = %0.1f'%(gm*1000),' mA/V ' # Round Off Error\n",
"\n",
"# the base emitter resistor rbe\n",
"rbe = (hfe/gm)#\n",
"print 'The base emitter resistor rbe is = %0.2f'%(rbe/1000),' K ohm ' # Round Off Error\n",
"\n",
"# the emitter capacitor Ce \n",
"\n",
"Ce = (gm/(2*pi*fT))#\n",
"print 'The emitter capacitor Ce = %0.2f'%(Ce*1e12),' pF ' # Round Off Error\n",
"\n",
"# the voltage gain of video amplifier is\n",
"# Av = (Vo/Vin) #\n",
"# Av = -((alpha3*gm)/(rbb*re3)*((1/rbb)+(1/rbe)+sCe)*((1/re2)+(1/re3)+sC3)*((1/Rl)+(s(Cs+Cl)))) \n",
" # At Avgc = 0 i.e s=0 in the above Av equation\n",
"alpha3 = 1 #\n",
"s = 0 #\n",
"# Rl = -((alpha3*gm)/(rbb*re3)*(((1/rbb)+(1/rbe))*((1/re2)+(1/re3))*(Av)))# \n",
"\n",
"# After solving above equation for Rl We get Rl Equation as\n",
"Rl = 10/(37.8*10**-3)#\n",
"print 'The value of resistance RL is = %0.2f'%Rl,' ohm '\n",
"\n",
"# there are three poles present in the transfer function of video amplifier each pole generate one 3-db frequency \n",
"Rl = 675 #\n",
"# fa = 1/(2*pi*Rl*(Cs+Cl))#\n",
"# after putting value of Rl ,Cs and Cl we get\n",
"fa = 1/(2*3.14*264.55*1*10**-12)#\n",
"print 'The pole frequency fa is = %0.2f'%(fa*10**-3/1000),' M Hz '# Round Off Error\n",
"\n",
"\n",
"#fb = 1/(2*pi*Ce*((rbb*rbe)/(rbb+rbe)))#\n",
"# after putting value of Ce rbb and rbe we get\n",
"fb = 1/(2*pi*6.05*10**-12*24.5)#\n",
"print 'The pole frequency fb is = %0.2f'%(fb*10**-3/1000),' M Hz '\n",
"\n",
"fc = 1/(2*pi*Cs*re3)#\n",
"print 'The pole frequency fc is = %0.2f'%(fc*10**-3/1000),' M Hz '\n",
"\n",
"print 'Hence fa is a dominant pole frequency '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.11 Pg 423"
]
},
{
"cell_type": "code",
"execution_count": 13,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The emitter resistor of Q3 is = 52.00 ohm \n",
"The trans conductance of transistor is = 38.5 mA/V \n",
"The base emitter resistor rbe is = 1.3 kohm \n",
"The emitter capacitor is = 6.12 pF \n",
"The value of resistance RL is = 5.00 ohm \n",
"The pole frequency fa is = 600.58 MHz \n",
"The pole frequency fb is = 1060.00 MHz \n",
"The pole frequency fc is = 3060.67 MHz \n",
"Hence fa is a dominant pole frequency \n"
]
}
],
"source": [
"# Design a video amplifier of IC 1550 circuit\n",
"Vcc = 12 # # V\n",
"Av = -10 #\n",
"Vagc = 0 # # at bandwidth of 20 MHz\n",
"hfe = 50 # # forward emitter parameter\n",
"rbb = 25 # # ohm # base resistor\n",
"Cs = 1*10**-12 # # F # source capacitor\n",
"Cl = 1*10**-12 # # F # load capacitor\n",
"Ie1 = 1*10**-3 # # A # emitter current of Q1\n",
"f = 1000*10**6 # # Hz\n",
"Vt = 52*10**-3 #\n",
"Vt1 = 0.026 #\n",
"\n",
"# When Vagc =0 the transistor Q2 is cut-off and the collector current of transistor Q2 flow through the transistor Q3\n",
"# i.e Ic1=Ie1=Ie3\n",
"Ie3 = 1*10**-3 # # A # emitter current of Q3\n",
"Ic1 = 1*10**-3 # # A # collector current of the transistor Q1\n",
"\n",
"# it indicates that the emitter current of Q2 is zero Ie2 = 0 then the emitter resistor of Q2 is infinite\n",
"re2 = inf #\n",
"\n",
"# emitter resistor of Q3 \n",
"re3 = (Vt/Ie1)#\n",
"print 'The emitter resistor of Q3 is = %0.2f'%re3,' ohm '\n",
"\n",
"# the trans conductance of transistor is\n",
"gm = (Ie1/Vt1)#\n",
"print 'The trans conductance of transistor is = %0.1f'%(gm*1e3),' mA/V '\n",
"\n",
"# the base emitter resistor rbe\n",
"rbe = (hfe/gm)#\n",
"print 'The base emitter resistor rbe is = %0.1f'%(rbe/1e3),' kohm '\n",
"\n",
"# the emitter capacitor Ce \n",
"Ce = (gm/(2*pi*f))#\n",
"print 'The emitter capacitor is = %0.2f'%(Ce*1e12),' pF '\n",
"\n",
"# the voltage gain of video amplifier is\n",
"# Av = (Vo/Vin) #\n",
"# Av = -((alpha3*gm)/(rbb*re3)*((1/rbb)+(1/rbe)+sCe)*((1/re2)+(1/re3)+sC3)*((1/Rl)+(s(Cs+Cl)))) \n",
" # At Avgc = 0 i.e s=0 in the above Av equation\n",
"alpha3 = 1 #\n",
"s = 0 #\n",
"Av =-10 #\n",
"Rl = -((alpha3*gm)/((rbb*re3)*(((1/rbb)+(1/rbe))*((1/re2)+(1/re3))*(Av))))# \n",
"Rl = (1/Rl)#\n",
"print 'The value of resistance RL is = %0.2f'%Rl,' ohm '\n",
"\n",
"# there are three poles present in the transfer function of video amplifier each pole generate one 3-db frequency \n",
"Rl = 265\n",
"fa = 1/(2*pi*Rl*(Cs))/1e6#\n",
"print 'The pole frequency fa is = %0.2f'%fa,'MHz '\n",
"\n",
"\n",
"fb = 1/(2*pi*Ce*((rbb*rbe)/(rbb+rbe)))/1e6\n",
"print 'The pole frequency fb is = %0.2f'%fb,'MHz '\n",
"\n",
"fc = 1/(2*pi*Cs*re3)/1e6\n",
"print 'The pole frequency fc is = %0.2f'%fc,'MHz '\n",
"\n",
"print 'Hence fa is a dominant pole frequency '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.12 Pg 425"
]
},
{
"cell_type": "code",
"execution_count": 18,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The input current is = 0.50 mA \n",
"The output of an op-amp is = 27.50 V \n"
]
}
],
"source": [
"# Determine the output voltage of an isolation amplifier IC ISO100\n",
"Vin = 5.0 # # V\n",
"Rin = 10*10**3 # \n",
"Rf = 55*10**3 # # ohm # feedback resistance\n",
"\n",
"# the input voltage of an amplifier 1\n",
"# Vin = Rin*Iin\n",
"Iin = Vin/Rin # \n",
"print 'The input current is = %0.2f'%(Iin*1e3),'mA '\n",
"\n",
"# In isolation amplifier ISO 100 the input current Iin is equal to the output current Iout , but both are opposite in direction\n",
"# Iin = -Iout\n",
"# the output of an op-amp\n",
"# Vo = -Rf*Iout\n",
"Vo = Rf*Iin#\n",
"print 'The output of an op-amp is = %0.2f'%Vo,' V '"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 14.13 Pg 426"
]
},
{
"cell_type": "code",
"execution_count": 24,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The input current is = 12 mA \n",
"The output of an op-amp is = 204 V \n"
]
}
],
"source": [
"# Determine the output voltage of an isolation amplifier IC ISO100\n",
"Vin = 12.0 # # V\n",
"Rin = 1*10**3 # \n",
"Rf = 17*10**3 # # ohm # feedback resistance\n",
"\n",
"# the input voltage of an amplifier 1\n",
"# Vin = Rin*Iin\n",
"Iin = Vin/Rin # \n",
"print 'The input current is = %0.f'%(Iin*1e3),'mA '\n",
"\n",
"# In isolation amplifier ISO 100 the input current Iin is equal to the output current Iout , but both are opposite in direction\n",
"# Iin = -Iout\n",
"# the output of an op-amp\n",
"# Vo = -Rf*Iout\n",
"Vo = Rf*Iin#\n",
"print 'The output of an op-amp is = %0.f'%Vo,' V '"
]
}
],
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