Exp.4_RC_Coupled_BJT_Amplifier

Methodology:
1. Built the RC coupled BJT Amplifier circuit using resistances ,bypass capacitors,BJT,and voltage sources.
2. Input signal V1 is given to the circuit through a AC signal generator.
3. We then measure the peak to peak magnitude of the input.
4. Connect the voltage probes to the output side and observe the amplified output.
5. Measure the peak to peak magnitude of output voltage Vo.
6. Increase the frequency in steps and observe the magnitude of output voltage.
7. Note the output voltage and gain.
8. Analyze AC sweep analysis.

Observations:

Without feedback (Vin_p-p = 100 mV)

Frequency
Vout_p-p
Gain (Vout_p-p/ Vin_p-p)
Voltage gain in dB
20* log(Av)

1kHz
9.0981
90.981
39.17901

10kHz
10.3294
103.294
40.2815

100kHz
10.1329
101.229
40.1061

1MHz
7.399
73.99
37.38346

10MHz
12.0979
120.979
41.6542

100MHz
3.24567
32.4567
30.22609

Conclusion: In this experiment, when we increase input frequency output voltage increases and voltage gain in dB also increase and after some frequency it decreases. We can see that in graph (for AC sweep) output voltage is increase exponentially and after some frequency it decreases it also provides extra gain to the output voltage.