Preliminary Questions

1.

The following questions refer to Fig. 4.2. Take $R_1=90K,~R_2=10K,~R_C=7K,~R_E=700,~R_L=\infty$ and V_CC=15V.

• Find the voltage gain at midband frequencies.
• Use the brute force approach to find the low-band gain versus frequency.
• Use the SCTCA to approximate the low-band gain versus frequency with a single pole.
• Sketch your results on a Bode plot.

2.

The following questions refer to the circuit in Fig.4.9.

• Calculate the small signal voltage gain at midband frequencies.
• Use the Miller approximation to calculate the dominant high-frequency pole of the circuit.
• Sketch the gain from midband to high frequencies on a Bode plot.

3.

The following questions refer to the circuit in Fig.4.15. For this question only, assume that $C_\pi = C_\mu = 1.0 pf$ (picofarads).

• Use the SCTCA and the OCTCA to obtain the low and high frequency single pole approximations for the frequency response of this circuit.
• Sketch the gain of this circuit versus frequency from 1Hz to 100MHz on a Bode plot.