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Normally biased bjt circuit comprising of a bjt

Assignment Help Other Engineering
Reference no: EM131075275

OBJECTIVES

  1. To analyze a normally biased BJT circuit comprising of a BJT and resistors and measure the circuit voltages between emitter, common, base, and collector.

  2. To theoretically calculate and verify the circuit using Ohm's law or Kirchhoff's law, which were learned in previous classes.

  3. Determine the voltage drop across the collector load resistance and measure the current passing through emitter and collector resistors.

  1. Determine if the collector-based junction is forward or reversed biased.

    II.      PARTS / Equipment List:

    Equipment:

IBM PC or compatible                             

DMM (digital multimeter)

         Variable dc power supply

Parts:    

Qty.

Component

Tolerance Band

Wattage Rating, W

  
 

1

2N3904 Transistor

 

 

 

6

10 K ?  Resistor

gold

¼

 

1

Proto Board

 

 

 

 

Hookup wires of different colors

 

 

 

6- 10 k? resistor

1 - 2N3904 Transistor                                          

Wire and wire stripper                             

Software:

MultiSim 11

PROCEDURE

  1. Theoretical analysis of the Circuit

    1. Given the circuit in Figure 1, calculate the total resistance between the base and VCC in kΩ and the total collector resistance (combination of R3 and R4) in kΩ.  Enter the values obtained in Table 1 on the worksheet.

    2. Given Figure 1, calculate the circuit voltages cited below and enter the values in Table 2 on the worksheet.

Voltages

VCC

Emitter to common

Base to common

Collector to common

Base to emitter

Collector to emitter

    1. If resistor R2 is removed from the base circuit, calculate the circuit resistances and voltages cited below and enter the values in Tables 3 and 4 respectively on the worksheet.

Resistances (KΩ)

Base and +VCC

Total Collector Resistance

Voltages (V)

VCC

Emitter to common

Base to common

Collector to common

Base to emitter

Collector to emitter
  1.  

    1. Put resistor R2 back in the circuit and remove R4 from the collector circuit. Calculate the circuit resistances and circuit voltages cited in part A.3 above and enter the calculated values in Tables 5 and 6 respectively on the worksheet.

  1. Multisim Simulation and Circuit Calculations

  1. Launch the Multisim Simulator and build the circuit schematic shown in Fig. 1.Note that you will need a Digital Multimeter to measure the output voltages.

  2. Set the dc source voltage to 9V. Consider the negative side of the source as common, and measure the circuit voltages cited below. Enter measured values in Table 7 on the worksheet.

Measured Voltages

VCC

Emitter to common

Base to common

Collector to common

Base to emitter

Collector to emitter

  1. Answer the following questions on the worksheet:

  1. How much current is passing through the emitter resistor in mA?

  2. What is the voltage drop across the collector load resistance (VRC) in V?

  3. What, approximately, is the collector current in mA?

  1. Remove resistor R2 from the base circuit and measure the circuit voltages cited in part B.2 above. Enter measured values in Table 8 on the worksheet.

  1. Answer the following questions on the worksheet:

  1. What is the total resistance between the base and +Vcc?

  2. How much current is passing through the emitter resistor in mA?

  3. What is the voltage drop across the collector load resistance (VRC) in V?

  4. What, approximately, is the collector current in mA?

  1. Replace resistor R2 as shown in Figure 1 and remove resistor R4 from the collector circuit. Measure the circuit voltages cited in part B.2 above and enter the values in Table 9 on the worksheet.

  1. Answer the following questions on the worksheet:  

  1. What is the total resistance between the base and +Vcc?

  2. How is passing through the emitter resistor in mA?

  3. What is the voltage drop across the collector load resistance (VRC) in V?

  4. What is the collector current in mA? Approximate.

  1. Construction of the BJT Biasing Circuit on a proto board and Measurement of Circuit Characteristics

  1. Construct the circuit in Fig 1. Take a picture of your circuit and place it on the worksheet.

  2. Set the DMM to measure the output voltages at different points in the circuit.

  3. Set the dc source voltage to 9V. Consider the negative side of the source as common, and measure the circuit voltages cited in part B.2. Enter measured values in Table 10.

  1. Answer the following questions on the worksheet:

  1. Is the base positive or negative with respect to the emitter?

  2. Is the base-to-emitter voltage close to 0.7 V?

  3. Is the collector-to-emitter voltage less than Vcc?

  4. Is the collector-to-emitter voltage greater than 0.3 V?

  5. How much current must be passing through the emitter resistor in mA?

  6. What is the voltage drop across the collector load resistance (VRC) in V?

  7. What is the collector current in mA? Approximate.

  8. Is the collector more positive or negative than the base?

  9. Is the collector-base junction forward or reverse biased?

  10. Is the transistor operating in cutoff, linear or saturation region?

  1. Remove resistor R2 from the base circuit and measure the circuit voltages cited in part B.2 above. Enter measured values in Table 11 on the worksheet.

  1. Answer the following questions on the worksheet:

  1. What is the total resistance between the base and +Vcc?

  2. Is the base-to-emitter voltage close to 0.7 V?

  3. Is the collector-to-emitter voltage less than Vcc?

  4. Is the collector-to-emitter voltage greater than 0.3 V?

  5. How much current must be passing through the emitter resistor in mA?

  6. What is the voltage drop across the collector load resistance (VRC) in V?

  7. What is the collector current in mA? Approximate.

  8. By removing R2 and therefore changing the value of the base-to-VCC resistance. Has it changed the collector-to-emitter voltage? How?

  9. By removing R2 and therefore changing the value of the base-to-VCC resistance. Has it changed the collector current? How?

  10. By removing R2 and therefore changing the value of the base-to-VCC resistance. Has it changed the base-to-emitter voltage? By how much?

  11. By removing R2 and therefore changing the value of the base-to-VCC resistance. Has it changed the emitter current? How?

  12. Is the transistor operating in cutoff, linear, or saturation region?

  1. Replace resistor R2 as shown in Figure 1 and remove resistor R4 from the collector circuit. Measure the circuit voltages cited in part B.2 above. Enter measured values in Table 12 on the worksheet.

  2. Answer the following questions on the worksheet:

  1. What is the total resistance between the base and +Vcc?

  2. Is the base-to-emitter voltage close to 0.7 V?

  3. Is the collector-to-emitter voltage less than Vcc?

  4. Is the collector-to-emitter voltage greater than 0.3 V?

  5. How much current must be passing through the emitter resistor in mA?

  6. What is the voltage drop across the collector load resistance (VRC) in V?

  7. What is the collector current in mA? Approximately.

  8. By removing R4 and therefore changing the value of the base-to-VCC resistance. Has it changed the collector-to-emitter voltage? How?

  9. By removing R4 and therefore changing the value of the base-to-VCC resistance. Has it changed the collector current? How?

  10. By removing R4 and therefore changing the value of the base-to-VCC resistance. Has it changed the base-to-emitter voltage? By how much?

  11. By removing R4 and therefore changing the value of the base-to-VCC resistance. Has it changed the emitter current? How?

  12. Is the transistor operating in cutoff, linear, or saturation region?

     

IV.    SUMMARY

Please provide the answer to the following questions on the worksheet:

a)   Did your theoretical calculations closely match the results obtained from the Multisim simulation? (Yes/ No)  

      Comments:

b)   Did your theoretical calculations closely match the results obtained from the Proto Board circuit? (Yes/ No)

      Comments:

c)   Did your results obtained from the Multisim simulation closely match the results obtained from the Proto Board circuit? (Yes/ No)

    Comments:

Reference no: EM131075275

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