1. Connect the circuit shown in Fig.3 and measure the DC voltages VB, VE, and Vc. Try to measure the DC current gain of the BC107 transistor hfe using a multi-meter. Tabulate your results as illustrated in Table-1. Tablc-1: Measured Quautities fur the DC Bias Circuit Parameter B VB VE Vc IcQ VCEQ VBEQ re Value Vcc +12V Rc R1 2.7K 10K BC107 Vc VE REI (Ve R2 3.3K 1202 RE2 1K Figure 3: The DC Bias Circuit of the Amplifier

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periment 12
Amplifier Frequency Response
= min( f, fu2)
(11)
The frequency at which the amplifier's gain drops to 1 (or 0 dB) is called the unity-gain
frequency and is denoted by fr. The significance of fr is that it always equals the product of
the mid-band gain times the bandwidth of the amplifier.
f, = ABW
(12)
2. Procedure .
1. Connect the circuit shown in Fig.3 and measure the DC voltages VB, VE, and Vc. Try
to measure the DC current gain of the BC107 transistor hFe using a multi-meter.
Tabulate your results as illustrated in Table-1.
Tablc-1: Measured Quautities fur the DC Bias Circuit
Parameter | B
VB
VE
Vc
IcQ
VCEQ | VBEQ re
Value
Vc
+12V
R1
Rc
10K
2.7K
BC107
R2
REI
Vc
(Ve
3.3K
1202
VE
RE2
1K
Figure 3: The DC Bias Circuit of the Amplifier
** 2. Connect the amplifier circuit shown in Fig.4. Apply a sinusoidal source signal with peak-
to-peak amplitude of 0.2V and vary the frequency from 50 Hz to 10 MHz in several steps.
Display both the input (source) and output (load) signals on the oscilloscope. Try to
measure the amplitude of the output signal, and the amplifier gain as unit-less value, and in
dB as well. Tabulate your results as illustrated in Table-2.
Transcribed Image Text:periment 12 Amplifier Frequency Response = min( f, fu2) (11) The frequency at which the amplifier's gain drops to 1 (or 0 dB) is called the unity-gain frequency and is denoted by fr. The significance of fr is that it always equals the product of the mid-band gain times the bandwidth of the amplifier. f, = ABW (12) 2. Procedure . 1. Connect the circuit shown in Fig.3 and measure the DC voltages VB, VE, and Vc. Try to measure the DC current gain of the BC107 transistor hFe using a multi-meter. Tabulate your results as illustrated in Table-1. Tablc-1: Measured Quautities fur the DC Bias Circuit Parameter | B VB VE Vc IcQ VCEQ | VBEQ re Value Vc +12V R1 Rc 10K 2.7K BC107 R2 REI Vc (Ve 3.3K 1202 VE RE2 1K Figure 3: The DC Bias Circuit of the Amplifier ** 2. Connect the amplifier circuit shown in Fig.4. Apply a sinusoidal source signal with peak- to-peak amplitude of 0.2V and vary the frequency from 50 Hz to 10 MHz in several steps. Display both the input (source) and output (load) signals on the oscilloscope. Try to measure the amplitude of the output signal, and the amplifier gain as unit-less value, and in dB as well. Tabulate your results as illustrated in Table-2.
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