Objective:
- To design and simulate the multi-stage BJT transistor amplifier circuit to meet multi
specifications. - To obtain the frequency response of a BJT amplifier.
Specification:
a) Mid-band voltage gain = 40-50.
b) Input resistance > 2.5 kΩ
c) Output resistance < 50 Ω
d) Single power supply of 10 V.
Design:
Use PN2222A transistor and assume β = 180. You may assume your circuit is to be driven from the function generator, which has a source impedance of 50 Ω. Make sure that the Q point is bias-stable and is set at the middle of the load-line in order to avoid signal distortion.
Simulation:
Simulate your circuit using MultiSim. If the simulated circuit does not meet the specifications, modify your design accordingly.
a) Run DC simulation first and report the Q point.
b) Run AC analysis on your circuit in order to obtain the mid-band gain and the frequency response.
c) Draw the magnitude Bode plot of the voltage gain. Show the mid-band gain.
d) Find the corner frequencies and bandwidth of the amplifier. (Please use a cursor in the bode plot)
e) Measure the input impedance of your circuit.
f) Measure the output impedance of your circuit.
g) When input is a 10kHz sinusoidal wave with 1mV amplitude, please plot the output signal with the input signal (Transient simulation). When you increase the amplitude of input voltage, please observe how the output voltage changes. When does the output waveform start to be distorted?
Report:
Your report should include introduction, theory, design, simulation, result, discussion and conclusion.