43.5.1. Connections and Attenuation in Common Source Stage

Try these first

1. 1.

   What is the effect of cascading two amplifiers?

   Hint

   Think about how the output of the first affects the input of the second.

2. 2.

   Define a buffer in electronics.

   Hint

   What role do buffers play between amp stages?

3. 3.

   What does cascading two amplifiers typically expect to achieve?

   • Increased bandwidth
   • Higher gain
   • Lower bandwidth

   Hint

   Think about why we connect amplifiers together.

4. 4.

   True or False: The upper cutoff frequency can increase when amplifiers are cascaded.

   • True
   • False

   Hint

   Recall the conditions affecting bandwidth.

5. 5.

   Calculate the total gain from cascading two amplifiers with gains of 15 and 10, if the loading effect drops the effective gain by half.

   Hint

   Consider how the loading effect changes your expectations about gains.

6. 6.

   Given a CS amplifier with a cutoff frequency of 2 kHz and a CE amplifier with 1.5 kHz, determine the overall upper cutoff frequency after cascading.

   Hint

   Think about which stage limits the upper frequency response.