ECET220 Laboratory 2 Analysis of BJT Amplifier Classes of Operation using Simula
ID: 1810209 • Letter: E
Question
ECET220 Laboratory 2
Analysis of BJT Amplifier Classes of Operation using
Simulation and Actual Construction
1. To analyze a BJT Amplifier Classes Amplifier comprising of two capacitors (C) and resistors (R) and measure voltage drops and currents at different locations.
2. To theoretically calculate and verify the circuit using Ohms law and Kirchhoffs law, which were learned in previous courses.
3. Determine the voltages (VE, VC, VB) with respect to the circuit common. Measure and verify the same using the simulation.
4. Determine if the output voltage is in-phase or out-of-phase with its input waveform.
II. PARTS / Equipment List:
Equipment:
Function Generator
DMM (digital multimeter)
Variable dc power supply
Oscilloscope
Parts:
Qty.
Component
Tolerance Band
Wattage Rating, W
1
2N3904 Transistor
1
470 ? Resistor
gold
1
2 K ? Resistor
gold
1
10 K ? Resistor
gold
1
47 K ? Resistor
gold
1
1.0 uF Capacitor
1
10 uF Capacitor
1
Proto Board
3
BNC to split ends cable
Hookup wires of different colors
Software:
MultiSim 11
A. Theoretical analysis of the Circuit
1. Given the circuit in Figure 1, calculate the dc voltages with respect to circuit common, and collector current, as cited in the table below. Enter the calculated values in Table 1 on the worksheet.
Figure 1
Calculate Voltages Below
Voltages (V)
Voltage from emitter to common (VE)
Voltage from collector to common (VC)
Voltage from base to common (VB)
Calculate: Voltage drop between collector and emitter (VCE)
Calculate: Voltage drop between base and emitter (VBE)
Voltage across the collector resistor (R2)
Calculate Current Below
Current (mA)
Collector current
Table 1
B. Multisim Simulation and Circuit Calculations
1. Connect the circuit as shown in Figure 1. Set the dc source for a VCC of +9V. Connect Vin to the function generator and make sure that it is in the sine-wave mode set for 0-V output.
2. Measure the dc voltages with respect to circuit common, and collector current, as cited in Table 1 above and enter the measured values in Table 2 on the worksheet.
3. Set the function generator that is connected to Vin to the sine-wave mode and set the input signal to 1 kHz at 0.5 V peak-to-peak. If the output signal (Vout) is clipped, reduce the input signal level until the clipping action is no longer observed.
4. Connect Vin to one channel of the Oscilloscope and Vout to the second channel of the oscilloscope.
5. Capture the input and output waveforms using print screen and place them on the worksheet. Also, answer the following questions on the worksheet:
a. What is the peak to peak voltage of Vin from the Oscilloscope waveform?
b. What is the peak to peak voltage of Vout from the Oscilloscope waveform?
c. Are the Vin and Vout waveforms in phase or out of phase?
d. Calculate the voltage gain (AV) of this circuit.
6. Slowly decrease the voltage level of the signal to one-half the amount used in step 3.
7. Capture the input and output waveforms using print screen and place them on the worksheet. Also, answer the following questions on the worksheet:
a. What is the peak to peak voltage of Vin from the Oscilloscope waveform?
b. What is the peak to peak voltage of Vout from the Oscilloscope waveform?
C. Construction of the BJT Amplifier Circuit on a proto board and Measurement of Circuit Characteristics
1. Construct the circuit in Figure 1. Take a picture of your circuit and place it on the worksheet.
2. Set the dc source for a VCC of +9V. Connect the signal source Vin to a function generator with sine-wave mode selected. For now, make sure the output voltage is set for zero.
3. Measure the dc voltages with respect to circuit common and collector current as cited in Table 1 above, and enter the measured values in Table 3 on the worksheet.
4. Connect Vin to one channel of the Oscilloscope and Vout to the second channel of the oscilloscope. Adjust the signal source at Vin to be a signal of 1 kHz at 0.5 VPP. Capture the input and output waveforms using print screen and place them in the worksheet. Also, answer the following questions on the worksheet:
a. What is the peak to peak voltage of Vin from the Oscilloscope waveform?
b. What is the peak to peak voltage of Vout from the Oscilloscope waveform?
c. Are the Vin and Vout waveforms in phase or out of phase?
d. Calculate the voltage gain (AV) of this circuit?
5. Slowly decrease the voltage level of the signal to one-half the amount used in step 3.
6. Capture the input and output waveforms using print screen and place them on the worksheet. Also, answer the following questions on the worksheet:
a. What is the peak to peak voltage of Vin from the Oscilloscope waveform?
b. What is the peak to peak voltage of Vout from the Oscilloscope waveform?
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:
Qty.
Component
Tolerance Band
Wattage Rating, W
1
2N3904 Transistor
1
470 ? Resistor
gold
1
2 K ? Resistor
gold
1
10 K ? Resistor
gold
1
47 K ? Resistor
gold
1
1.0 uF Capacitor
1
10 uF Capacitor
1
Proto Board
3
BNC to split ends cable
Hookup wires of different colors
Explanation / Answer
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