Design a common emitter amplifier as shown in Figure A2 with a split emitter resistor to control the gain. The specifications of the amplifier are listed below, and the 10 base currents method can be used for the design:
A2
Fixed parameters:
- VCC = 7.2V
- VE = VCC/3
- VBE = 0.7V
- Beta = 160
- RL = 75kOhms
Specification:
- Design for Max Symmetrical Swing
- IC = 0.7mA
- AV = 30dB
Sketch the DC voltages and superimpose the AC voltages on the same sketch to highlight your understanding of the design.
Determine the value of RE and RC.
Determine the values of RU and RL for the design.
Determine the bias components RET and REZ for the design.
Determine the input impedance of the transistor amplifier using the small signal equivalent model for the circuit above.
Sketch the small signal model.
Calculate the value of the input impedance.
Evaluate the influence of the coupling capacitor and the equivalent input impedance if they serve as a filter.
Figure A2: Common Emitter Amplifier Design