43.1. Analog Electronic Circuits

Try these first

1. 1.

   What does cascading mean in terms of amplifiers?

   Hint

   Think about how stages work in succession.

2. 2.

   What is a buffer used for in amplifier circuits?

   Hint

   Consider the function of a buffer in a series of amplifiers.

3. 3.

   What is the primary purpose of a buffer in amplifier circuits?

   • Increase gain
   • Reduce loading effects
   • Change frequency response

   Hint

   Think about what happens when amplifiers are directly connected.

4. 4.

   True or False: Cascading amplifiers will always increase the overall gain.

   • True
   • False

   Hint

   Consider the definition of cascading effects.

5. 5.

   You are given a CE amplifier with a gain of 18 and a bandwidth of 200 Hz. You cascade it with another CE amplifier with a gain of 10 but face a loading effect leading to a gain reduction by 0.5. What is the overall gain and how does the bandwidth change?

   Hint

   Don’t forget to apply both concepts of gain and frequency response.

6. 6.

   Design a theoretical circuit with two cascaded CS amplifiers. The first has a gain of 15, and the second has a gain of 12, considering a loading effect of 0.7. How would you calculate the effective gain, and what factors would you identify that may affect the upper cutoff frequency?

   Hint

   There's a combination of loading and capacitance you need to consider for cutoff frequency.