61.1.1. High Output Impedance

Try these first

1. 1.

   What is output impedance?

   Hint

   Think about how amplifiers interact with what they connect to.

2. 2.

   Explain briefly what a cascode amplifier does.

   Hint

   Consider the idea of stacking transistor configurations.

3. 3.

   What does a cascode amplifier primarily improve?

   • Input Capacitance
   • Output Impedance
   • Signal Fidelity

   Hint

   Focus on what physical addition alters the output characteristics.

4. 4.

   True or False: A higher input impedance can lead to better signal integrity.

   • True
   • False

   Hint

   Think about the effect of loads attached to circuits.

5. 5.

   Suppose you have a cascode amplifier configuration where the lower transistor has 10kΩ output impedance and the upper transistor introduces an additional 20kΩ. Calculate the total output impedance of the amplifier.

   Hint

   Use the parallel resistor formula to combine impedances.

6. 6.

   Design a cascode amplifier for a given application with specific input and output requirements. What measurements would you take to ensure proper functionality?

   Hint

   Consider the circuit's intended application and operating range.