75.2.1. Basic Operation

Try these first

1. 1.

   What is the role of a differential amplifier?

   Hint

   Think about the main function it serves in circuits.

2. 2.

   Define common mode gain.

   Hint

   What happens to signals that are the same at both terminals?

3. 3.

   What is the main purpose of a differential amplifier?

   • To amplify a single input signal
   • To amplify the difference between two input signals
   • To reject all signals

   Hint

   Consider what makes it different from standard amplifiers.

4. 4.

   True or False: Lower common mode gain is preferable in differential amplifiers.

   • True
   • False

   Hint

   What helps keep unwanted signals out of the output?

5. 5.

   Design a differential amplifier circuit that maintains a high differential mode gain while minimizing common mode gain.

   Hint

   Think about what components need to match to achieve the desired gains.

6. 6.

   Evaluate two different configurations of differential amplifiers, one using BJTs and the other using MOSFETs. Compare their performance based on gain characteristics and applications.

   Hint

   Consider the specific advantages each type of transistor provides.