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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Textbook Question
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Chapter 5, Problem D5.31P

(a) The bias voltage in the circuit in Figure P5.3 1 is changed to V C C = 9 V . The transistor current gain is β = 80 . Design the circuit such that I C Q =0 .25mA and V C E Q = 4.5 V . (b) If the transistor is replaced by a new one with β = 120 , find the new values of I C Q and V C E Q . (c) Sketch the load line and Q−point for both parts (a) and (b).

Chapter 5, Problem D5.31P, (a) The bias voltage in the circuit in Figure P5.3 1 is changed to VCC=9V . The transistor current
Figure P5.31

(a)

Expert Solution
Check Mark
To determine

The design parameters of the circuit.

Answer to Problem D5.31P

The required values are

  IBQ=3.125μA

  RC=18kΩ

  RB=2.656MΩ

  IEQ=0.2531mA

Explanation of Solution

Given:

The bias voltage is VCC=9V .

The transistor current gain is β=80

  ICQ=0.25mA and VCEQ=4.5V

  Microelectronics: Circuit Analysis and Design, Chapter 5, Problem D5.31P , additional homework tip  1

Calculation:

Considering the BJT (Bipolar Junction Transistor) as single node, then by Kirchhoff’s current law the emitter current is:

  IE=IB+IC(1)

We know that in common emitter mode, the current gain is related as

  ICQ=βIBQ(2)IBQ=ICQβIBQ=0.25×10380IBQ=3.125μA

Applying Kirchhoff’s voltage law to the input circuit

  IBQRBVBE(on)+VCC=0(3)RB=VCCVBE(on)IBQRB=90.73.125×106RB=8.33.125×106RB=2.656MΩ(4)

From equation (1), quiescent values as

  IEQ=IBQ+ICQIEQ=(3.125×103+0.25)×103IEQ=0.2531mA

Applying Kirchhoff’s voltage law at the output for the given circuit as

  ICQRCVCEQ(on)+VCC=0(5)RC=VCCVCEQICQRC=94.50.25×103RC=4.50.25×103RC=18kΩ(6)

Conclusion:

Therefore, the required values are

  IBQ=3.125μA

  RC=18kΩ

  RB=2.656MΩ

  IEQ=0.2531mA

(b)

Expert Solution
Check Mark
To determine

To find: the new values of ICQ and VCEQ .

Answer to Problem D5.31P

The required values are

  VCEQ=2.25V

  ICQ=0.375mA

Explanation of Solution

Given:

  β=120

Calculation:

From equation (4) and (6),

  RB=2.656MΩ , RC=18MΩ and β=120

From equation (3),

  IBQRBVBE(on)+VCC=0IBQ=VCCVBE(on)RBIBQ=90.72.656×106IBQ=8.32.656×106IBQ=3.125μA

From equation (2),

  ICQ=βIBQICQ=(120)(3.125×106)ICQ=0.375mA

From equation (5),

  VCEQ=VCCICQRCVCEQ=9(0.375×103)(18×103)VCEQ=96.75VCEQ=2.25V

Conclusion:

Therefore, the required values are

  VCEQ=2.25V

  ICQ=0.375mA

(c)

Expert Solution
Check Mark
To determine

To sketch: the load the line and Q -point for both parts (a) and (b).

Answer to Problem D5.31P

When β=80

  Microelectronics: Circuit Analysis and Design, Chapter 5, Problem D5.31P , additional homework tip  2

When β=120

  Microelectronics: Circuit Analysis and Design, Chapter 5, Problem D5.31P , additional homework tip  3

Explanation of Solution

Given:

The bias voltage is VCC=9V .

The transistor current gain is β=80

  ICQ=0.25mA and VCEQ=4.5V

  Microelectronics: Circuit Analysis and Design, Chapter 5, Problem D5.31P , additional homework tip  4

Calculation:

When β=80

Thus, the load line equation is

From equation (5) can be written as

  ICRCVCE+VCC=0VCE=VCCICRCVCE=918×103lC

Now, put IC=0A in above equation then

  VCE=918×103(0)VCE=9V

Now, put VCE=0V in above equation then

  0=918×103lC18×103lC=9lC=0.5mA

Thus, the co-ordinates of Q -points are

  VCEQ=4.5V and ICQ=0.25mA

Thus, the load line and Q -Point are plotted as

  Microelectronics: Circuit Analysis and Design, Chapter 5, Problem D5.31P , additional homework tip  5

When β=120

Thus, the load line equation is

From equation (5) can be written as

  ICRCVCE+VCC=0VCE=VCCICRCVCE=918×103lC

Now, put IC=0A in above equation then

  VCE=918×103(0)VCE=9V

Now, put VCE=0V in above equation then

  0=918×103lC18×103lC=9lC=0.5mA

Thus, the co-ordinate of Q -points are

  VCEQ=2.25V and ICQ=0.375mA

Thus, the load and Q -Point are plotted as

  Microelectronics: Circuit Analysis and Design, Chapter 5, Problem D5.31P , additional homework tip  6

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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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