Experiment: Low Frequency Response of CE Amp

1.

Using techniques for Lab 2, design a CE amp circuit with midband gain of 15. Bias the circuit so that the swing is approximately maximum. For coupling capacitors use $C_1=C_2=0.1\mu F$Do NOT use an emitter bypass capacitor. (If you used typical values for R₁, R₂, R_C and R_E, then you should reach the midband region at approximately $\omega \approx 10KHz$.)

2.

Measure the gain of the circuit at midband and determine if your design agree with experiment.

3.

Use the SCTCA to approximate the frequency response of the circuit.

4.

Measure the gain as a function of frequency and determine the error of the SCTCA. Start at 10Hz and increase your frequency to 100kHz, making about two measurements per decade.

5.

Sketch a Bode plot of the theoretical and experimental responses of the circuits.

6.

Add a $0.1\mu m$ bypass emitter capacitor in parallel with the emitter resistor. Use the SCTCA to approximate the frequency response of the circuit. Measure the gain as a function of frequency and compare to your calculations. Start at 10Hz and increase your frequency to 100kHz, making about two measurements per decade.

7.

Sketch a Bode plot of the theoretical and experimental responses of the circuits.