3.3.1. Differential Amplifier (Input Stage)

Try these first

1. 1.

   What is the primary function of a differential amplifier?

   Hint

   What do we mean by 'difference' in this context?

2. 2.

   What type of transistors are commonly used in a differential pair?

   Hint

   Think about the technology used in CMOS circuits.

3. 3.

   What is the main function of a differential amplifier?

   • To amplify the difference in two input signals
   • To only amplify positive signals
   • To make signals louder

   Hint

   Think about what differentiates it from other types of amplifiers.

4. 4.

   The tail current source in a differential amplifier...

   • True
   • False

   Hint

   Is constant current important for stability?

5. 5.

   Design a differential amplifier that can achieve a specific gain of 100. What component values would you choose?

   Hint

   What ratio do you need to achieve a gain of 100?

6. 6.

   Evaluate how reducing the tail current would affect the stability of a differential amplifier.

   Hint

   What happens to performance if you don't have enough current?