43.6.2. Expression for Overall Gain with Buffer

Try these first

1. 1.

   What is the purpose of buffering in amplifier circuits?

   Hint

   Think about how stages interact.

2. 2.

   What happens to gain when amplifiers are cascaded?

   Hint

   Consider the effects of resistance.

3. 3.

   What is the primary issue when cascading CE or CS amplifiers?

   • Increased gain
   • Reduced gain due to loading effects
   • Increased bandwidth

   Hint

   Consider what happens to the output when two stages are closely connected.

4. 4.

   True or False? Buffers are only required for Common Emitter amplifiers.

   • True
   • False

   Hint

   Think about the function of buffers in general.

5. 5.

   You cascade two amplifiers, one with a gain of 20 and the other with a gain of 5. However, due to loading effect, you find an attenuation factor of 0.75. Calculate the overall gain.

   Hint

   Use the overall gain formula discussed in class.

6. 6.

   Design a buffer circuit for two amplifiers, considering you need a high input resistance and low output capacitance. Describe your design.

   Hint

   Think about components that have appropriate performance characteristics.