33.5.2. Small Signal Equivalent Circuit

Try these first

1. 1.

   What is the small signal model?

   Hint

   Consider how we approach amplifier analysis.

2. 2.

   Define voltage gain.

   Hint

   Think of the significance of amplification.

3. 3.

   What is the primary characteristic of a small signal model?

   • It considers only D.C. components.
   • It focuses on small variations of signals.
   • It calculates large signal models.

   Hint

   Think about the purpose of using this model in amplifiers.

4. 4.

   True or False: The input resistance is affected by the output load.

   • True
   • False

   Hint

   Consider how input resistance is primarily defined.

5. 5.

   If a common source amplifier has a transconductance of 3 mA/V and a drain resistor of 10 kΩ, find the voltage gain. Then, what implications does this gain have for small signal amplification?

   Hint

   Use the voltage gain formula and ensure your units align.

6. 6.

   Graph the frequency response for a common source amplifier with indicated cutoff frequencies. Discuss how parasitic capacitance at high frequencies modifies performance.

   Hint

   Consider the physical factors influencing electrical behavior in your graph.