68.1.10. Input Resistance and Output Resistance Calculation

Try these first

1. 1.

   What is the definition of input resistance?

   Hint

   Think about what the components connected to the input do.

2. 2.

   What is an active load?

   Hint

   Recall why we use active loads in amplifiers.

3. 3.

   What is the main purpose of using an active load in amplifiers?

   • To decrease voltage gain
   • To enhance voltage gain
   • To reduce input resistance

   Hint

   Consider the benefit of using transistors in place of resistors.

4. 4.

   True or False: Input resistance is impacted by the bias resistors used in a circuit.

   • True
   • False

   Hint

   Think about the interactions of different components.

5. 5.

   Design a BJT amplifier with specific values for input and output resistance. Describe the process and calculations involved.

   Hint

   Make sure to consider the characteristic β values in your design.

6. 6.

   Given a table of different loads on a transistor circuit, find the optimal load that balances input and output resistances while maximizing gain.

   Hint

   Look closely at how each load affects both gain and stability.