62.2.5. Small Signal Equivalent Circuit Analysis

Try these first

1. 1.

   Define the term 'cascode amplifier'.

   Hint

   Think about the arrangement of transistors!

2. 2.

   What is the main advantage of using a common gate stage?

   Hint

   Consider what happens to current in this configuration.

3. 3.

   What is the main purpose of a cascode amplifier?

   • To increase voltage gain
   • To reduce noise
   • To lower output impedance

   Hint

   Think about why we cascade these specific configurations.

4. 4.

   True or False: The common gate stage of a cascode amplifier amplifies the input voltage.

   • True
   • False

   Hint

   Think about what happens to the current in this stage.

5. 5.

   Design a cascode amplifier circuit with specified values for transconductance and output load. Explain how to maintain the design within desired parameters.

   Hint

   Focus on hybrid circuits with both MOSFETs in saturation.

6. 6.

   Analyze how you would modify a cascode amplifier for improved high-frequency performance in a communication circuit.

   Hint

   Think about the interactions between impedance and signal frequency.