37.1.6. Frequency Response of the Amplifier

Try these first

1. 1.

   What is the frequency response of an amplifier?

   Hint

   Think about how changes in frequency affect output.

2. 2.

   Define a Bode plot.

   Hint

   What two aspects does it graphically represent?

3. 3.

   What is the gain of a Common Emitter amplifier represented by?

   • -g * RC
   • -g / RC
   • g * RC

   Hint

   Recall the formula relating to gain.

4. 4.

   True or False: The lower cutoff frequency is determined by the R-C network.

   • True
   • False

   Hint

   Think about the roles of capacitors in frequencies.

5. 5.

   Design a CE amplifier with a given specification of mid-band gain of 40 dB, and suitable lower and upper cutoff frequencies of 20 Hz and 20 kHz respectively.

   Hint

   Use the relationships between R and C to define cutoffs and correlate with gain.

6. 6.

   Analyze how replacing a capacitor in a CS amplifier affects the frequency response and suggest appropriate substitutions.

   Hint

   Consider how different capacitance values affect frequency characteristics.