EET120 Experiment 7: The Common-Collector Amplifier

EET120

Semiconductor Devices

Experiment 7: The Common-Collector Amplifier

Objectives:

After completing this experiment, you should be able to,

1. Calculate and measure the DC & AC parameters of the Common-Collector (CC) amplifier.

2. Observe the effect of the by-pass capacitor on amplifier voltage gain.

Components needed:

1. Resistors: (1) 33 k?, 10k?, 100 ?, (2) 1k?

2. Capacitors: 1 µF, 10 µF

3. Transistor: (1) PNP – 2N3906

4. Multisim

Procedure:

1. Build the following circuit in multisim.

VCC 12V

2N3906

kΩ

100Ω

kΩ

Figure 1: DC Equivalent circuit of CC amplifier

2. Calculate the DC parameters listed in Table 2 for the circuit shown in Figure 1.

DC Parameters	Calculated Value	Measured value
VB	2.79V	3.12V
VE	3.49V	3.88V
IE	8.51mA	8.12mA
VC	851mV	807mV
VCE	-2.64V	-3.076V

Table 2: Calculated and measured DC parameters

3. Measure and record the values in Table 2 using the DMM.

4. Modify the circuit as shown in Figure 2.

2N3906

VCC

Pin 49

kΩ

100Ω

µF

0.5

Vppk

kHz

µF

RL1

kΩ

Figure 2: The Common – Collector Amplifier

Input voltage VIN	Output voltage VOUT	Voltage gain AV
500mVPP	494mV	0.988
1VPP	970mV	0.97
2VPP	1.934V	0.967
3VPP	2.9V	0.97

Table 3: Calculated and measured AC parameters

10. Set the AC Source voltage to 500mVPP, 1 kHz sinewave.

11. Connect the first channel of the Oscilloscope across the AC source.

12. Connect the second channel of the Oscilloscope across the 1 k? load resistor.

13. You should be able to observe the signals as shown in Figure 3. Note: your scope screen may look different.

Figure 3: Input and Output signals of the CE Amplifier

14. By observing the input and output signals of the amplifier, the phase difference between them is approximately _____0____ degrees.

15. Record the output voltage Table 3.

16. Calculate the voltage gain (Av) using the measured input and output voltages using the formula below. Record the result in Table 3 under Voltage gain Av.

Voltage gain

17. Repeat step 15 and 16 by changing the input voltage as shown in Table 3 and record the results.

18. Summarize your observations on voltage gain below.

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EET120 Experiment 7: The Common-Collector Amplifier

Table 2: Calculated and measured DC parameters

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