70.3.4. Small Signal Equivalent Circuit

Try these first

1. 1.

   Define a single-ended amplifier in your own words.

   Hint

   Consider how it processes signals.

2. 2.

   What is a differential amplifier used for?

   Hint

   Think about situations where two signals are involved.

3. 3.

   What is the primary function of a differential amplifier?

   • To amplify single signals
   • To amplify the difference between two signals
   • To convert AC to DC

   Hint

   Think about what makes it 'differential.'

4. 4.

   True or False: Single-ended amplifiers process signals as the difference between two inputs.

   • True
   • False

   Hint

   Recall the definition of single-ended.

5. 5.

   Design a simple differential amplifier circuit using op-amps and analyze its gain.

   Hint

   Remember the formula for differential gain using resistor values.

6. 6.

   Explain how common-mode rejection ratio (CMRR) is critical in practical applications of differential amplifiers.

   Hint

   Consider why rejecting noise improves performance.