Microelectronics: Circuit Analysis and Design
Microelectronics: Circuit Analysis and Design
4th Edition
ISBN: 9780073380643
Author: Donald A. Neamen
Publisher: McGraw-Hill Companies, The
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Chapter 5, Problem 5.82P

Consider the circuit shown in Figure P5.82. The current gain for the npn transistor is β n = 120 and for the pnp transistor is β p = 80 . Determine I B 1 , I C 1 , I B 2 , I C 2 , V C E 1 , and V E C 2 .

Chapter 5, Problem 5.82P, Consider the circuit shown in Figure P5.82. The current gain for the npn transistor is n=120 and for
Figure P5.82

Expert Solution & Answer
Check Mark
To determine

The values of IB1,IC1,IB2,VCE1andVEC2 for the gain in current for the given transistor.

Answer to Problem 5.82P

  IB1=8.56μAIC1=1.0272mAIB2=0.134mAVCE1=5.142VVEC2=5.77V

Explanation of Solution

Given:

  βn=120 for the transistor npn.

  βp=80 for the transistor pnp

The circuit is given as:

  Microelectronics: Circuit Analysis and Design, Chapter 5, Problem 5.82P , additional homework tip  1

Resistance RTH for given fig.,

  RTH=R1R2=R1R2R1+R2

Substituting the value,

  R1=80×103andR2=40×103 according to fig.

  RTH=80× 103×40× 10380× 103+40× 103=3200× 103120=26.66kΩ

Now calculating the voltage VTH.

  VTH=(R2R1+R2)

Substituting the known values.

  VTH=( 40× 10 3 80× 10 3 +40× 10 3 )×9=3V

Now the equivalent circuit is drawn as:

  Microelectronics: Circuit Analysis and Design, Chapter 5, Problem 5.82P , additional homework tip  2

For given figure applying Kirchoff’s voltage law for base emitter loop of the circuit for transistor Q1 .

  VTH+IB1RTH+VBE( on)+IE1RE1=0VTH+IB1RTH+VBE( on)+(1+βn)IB1RE1=0IB1=V THV BE( on )R TH+( 1+ β n )R E1

Substituting all values:

  IB1=30.726.66× 103+( 1+120)×2× 103=2.3268.66×103=8.56μA

Now calculating the collector current IC1 .

  IC1=βnIB1

Putting the values:

  IC1=βnIB1IC1=120×8.56×106=1.0272mA

Now calculating the value of emitter current IE1 .

  IE1=(1+βn)IB1

Again substituting all values:

  IE1=(1+120)×8.56×106=81×0.134×103=1.036mA

According to Kirchoff’s law of current at the collector node of transistor Q1 in respective figure.

  IR1+IB2=IC19V C1R C1+IB2=IC1.............(1)

Now applying the Kirchoff’s voltage law in emitter- base loop for transistor Q2 .

  V+=IE2(100)+VEB(on)+VC1V+=(1+βp)IB2(100)+VEB(on)+VC1IB2=V+V EB( on)V C1( 1+ β p )×100........(2)

Substituting the value of IB2 in equation (1)

  9VC1RC1+V+VEB(on)VC1(1+βp)×100=IC1

Now putting all values:

  9V C12× 103+90.7V C1( 1+80)×100=1.0272×1039V C12+8.3V C18.1=1.0272VC1(12+1 8.1)=92+8.38.11.0272VC1=7.214V

According to equation (2)

  IB2=V+VEB(on)VC1(1+βp)×100

Putting all values:

  IB2=90.77.214( 1+80)×100=0.134mA

Now calculating IC2

  IC2=βpIB2

Substituting all values:

  IC2=80×0.134×103=10.73mA

Now calculating IE2 .

  IE2=(1+βp)IB2

Putting all values:

  IE2=(1+80)×0.134×103=81×0.134×103=10.86mA

Calculating VE1 now,

  VE1=IE1RE1

Putting all known values:

  VE1=1.036×103×2×103=2.072V

Now calculating VCE1 .

  VCE1=VC1VE1

Putting the values:

  VCE1=7.2142.072=5.142V

Now calculating VEC2 .

According to Kirchoff’s Law:

  VEC2=V+IC2RC2IE2RE2

Again substituting all values:

  VEC2=9(10.73× 10 3)(200)(10.86× 10 3)(100)=5.77V

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Chapter 5 Solutions

Microelectronics: Circuit Analysis and Design

Ch. 5 - (a) Verify the results of Example 5.3 with a...Ch. 5 - Consider the pnp circuit in Figure 5.22(a). Assume...Ch. 5 - In the following exercise problems, assume...Ch. 5 - In the following exercise problems, assume...Ch. 5 - The circuit elements in Figure 5.27(a) are changed...Ch. 5 - Using a PSpice simulation, plot the voltage...Ch. 5 - The parameters of the circuit shown in Figure...Ch. 5 - Design the commonbase circuit shown in Figure 5.33...Ch. 5 - The bias voltages in the circuit shown in Figure...Ch. 5 - The bias voltages in the circuit shown in Figure...Ch. 5 - The circuit elements in Figure 5.36(a) are V+=5V ,...Ch. 5 - For the transistor shown in the circuit of Figure...Ch. 5 - For the circuit shown in Figure 5.41, determine...Ch. 5 - Assume =120 for the transistor in Figure 5.42....Ch. 5 - For the transistor in Figure 5.43, assume =90 ....Ch. 5 - (a) Redesign the LED circuit in Figure 5.45(a)...Ch. 5 - The transistor parameters in the circuit in Figure...Ch. 5 - Redesign the inverter amplifier circuit shown in...Ch. 5 - For the circuit shown in Figure 5.44, assume...Ch. 5 - Consider the circuit shown in Figure 5.51(b)....Ch. 5 - [Note: In the following exercises, assume the BE...Ch. 5 - [Note: In the following exercises, assume the B—E...Ch. 5 - Consider the circuit in Figure 5.54(a), let...Ch. 5 - Prob. 5.16EPCh. 5 - The parameters of the circuit shown in Figure...Ch. 5 - Consider the circuit in Figure 5.54(a). The...Ch. 5 - Consider the circuit shown in Figure 5.58. The...Ch. 5 - In the circuit shown in Figure 5.60, the...Ch. 5 - The parameters of the circuit shown in Figure...Ch. 5 - For Figure 5.59, the circuit parameters are...Ch. 5 - In the circuit shown in Figure 5.61, determine new...Ch. 5 - For the circuit shown in Figure 5.63, the circuit...Ch. 5 - (a) Verily the cascode circuit design in Example...Ch. 5 - Prob. 1RQCh. 5 - Prob. 2RQCh. 5 - Prob. 3RQCh. 5 - Define commonbase current gain and commonemitter...Ch. 5 - Discuss the difference between the ac and dc...Ch. 5 - State the relationships between collector,...Ch. 5 - Define Early voltage and collector output...Ch. 5 - Describe a simple commonemitter circuit with an...Ch. 5 - Prob. 9RQCh. 5 - Prob. 10RQCh. 5 - Prob. 11RQCh. 5 - Describe a bipolar transistor NOR logic circuit.Ch. 5 - Describe how a transistor can be used to amplify a...Ch. 5 - Discuss the advantages of using resistor voltage...Ch. 5 - Prob. 15RQCh. 5 - Prob. 16RQCh. 5 - (a) In a bipolar transistor biased in the...Ch. 5 - (a) A bipolar transistor is biased in the...Ch. 5 - (a) The range of ( for a particular type of...Ch. 5 - (a) A bipolar transistor is biased in the...Ch. 5 - Prob. 5.5PCh. 5 - An npn transistor with =80 is connected in a...Ch. 5 - Prob. 5.7PCh. 5 - A pnp transistor with =60 is connected in a...Ch. 5 - (a) The pnp transistor shown in Figure P5.8 has a...Ch. 5 - An npn transistor has a reverse-saturation current...Ch. 5 - Two pnp transistors, fabricated with the same...Ch. 5 - The collector currents in two transistors, A and...Ch. 5 - Prob. 5.13PCh. 5 - Prob. 5.14PCh. 5 - In a particular circuit application, the minimum...Ch. 5 - A particular transistor circuit design requires a...Ch. 5 - For all the transistors in Figure P5.17, =75 . The...Ch. 5 - The emitter resistor values in the circuits show...Ch. 5 - Consider the two circuits in Figure P5.19. The...Ch. 5 - The current gain for each transistor in the...Ch. 5 - Consider the circuits in Figure P5.21. For each...Ch. 5 - (a) The circuit and transistor parameters for the...Ch. 5 - In the circuits shown in Figure P5.23, the values...Ch. 5 - (a) For the circuit in Figure P5.24, determine VB...Ch. 5 - (a) The bias voltages in the circuit shown in...Ch. 5 - The transistor shown in Figure P5.26 has =120 ....Ch. 5 - The transistor in the circuit shown in Figure...Ch. 5 - In the circuit in Figure P5.27, the constant...Ch. 5 - For the circuit shown in Figure P5.29, if =200 for...Ch. 5 - The circuit shown in Figure P5.30 is to be...Ch. 5 - (a) The bias voltage in the circuit in Figure P5.3...Ch. 5 - The current gain of the transistor in the circuit...Ch. 5 - (a) The current gain of the transistor in Figure...Ch. 5 - (a) The transistor shown in Figure P5.34 has =100...Ch. 5 - Assume =120 for the transistor in the circuit...Ch. 5 - For the circuit shown in Figure P5.27, calculate...Ch. 5 - Consider the commonbase circuit shown in Figure...Ch. 5 - (a) For the transistor in Figure P5.38, =80 ....Ch. 5 - Let =25 for the transistor in the circuit shown in...Ch. 5 - (a) The circuit shown in Figure P5.40 is to be...Ch. 5 - The circuit shown in Figure P5.41 is sometimes...Ch. 5 - The transistor in Figure P5.42 has =120 . (a)...Ch. 5 - The commonemitter current gain of the transistor...Ch. 5 - For the circuit shown in Figure P5.44, plot the...Ch. 5 - The transistor in the circuit shown in Figure...Ch. 5 - Consider the circuit in Figure P5.46. For the...Ch. 5 - The current gain for the transistor in the circuit...Ch. 5 - Consider the amplifier circuit shown in Figure...Ch. 5 - For the transistor in the circuit shown in Figure...Ch. 5 - Reconsider Figure P5.49. The transistor current...Ch. 5 - The current gain of the transistor shown in the...Ch. 5 - For the circuit shown in Figure P5.52, let =125 ....Ch. 5 - Consider the circuit shown in Figure P5.53. (a)...Ch. 5 - (a) Redesign the circuit shown in Figure P5.49...Ch. 5 - Prob. 5.55PCh. 5 - Consider the circuit shown in Figure P5.56. (a)...Ch. 5 - (a) Determine the Q-point values for the circuit...Ch. 5 - (a) Determine the Q-point values for the circuit...Ch. 5 - (a) For the circuit shown in Figure P5.59, design...Ch. 5 - Design a bias-stable circuit in the form of Figure...Ch. 5 - Using the circuit in Figure P5.61, design a...Ch. 5 - For the circuit shown in Figure P5.61, the bias...Ch. 5 - (a) A bias-stable circuit with the configuration...Ch. 5 - (a) For the circuit shown in Figure P5.64, assume...Ch. 5 - The dc load line and Q-point of the circuit in...Ch. 5 - The range of ß for the transistor in the circuit...Ch. 5 - The nominal Q-point of the circuit in Figure P5.67...Ch. 5 - (a) For the circuit in Figure P5.67, the value of...Ch. 5 - For the circuit in Figure P5.69, let =100 and...Ch. 5 - Prob. 5.70PCh. 5 - Design the circuit in Figure P5.70 to be bias...Ch. 5 - Consider the circuit shown in Figure P5.72. (a)...Ch. 5 - For the circuit in Figure P5.73, let =100 . (a)...Ch. 5 - Prob. D5.74PCh. 5 - (a) Design a fourresistor bias network with the...Ch. 5 - (a) Design a four-resistor bias network with the...Ch. 5 - (a) A fourresistor bias network is to be designed...Ch. 5 - (a) Design a fourresistor bias network with the...Ch. 5 - For each transistor in the circuit in Figure...Ch. 5 - The parameters for each transistor in the circuit...Ch. 5 - The bias voltage in the circuit shown in Figure...Ch. 5 - Consider the circuit shown in Figure P5.82. The...Ch. 5 - (a) For the transistors in the circuit shown in...Ch. 5 - Using a computer simulation, plot VCE versus V1...Ch. 5 - Using a computer simulation, verify the results of...Ch. 5 - Using a computer simulation, verify the results of...Ch. 5 - Consider a commonemitter circuit with the...Ch. 5 - The emitterfollower circuit shown in Figure P5.89...Ch. 5 - The bias voltages for the circuit in Figure...Ch. 5 - The multitransistor circuit in Figure 5.61 is to...
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