70.6. Equivalence of Signals in Amplifiers

Try these first

1. 1.

   Define a single-ended amplifier.

   Hint

   Think about how it connects to ground.

2. 2.

   What is a differential signal?

   Hint

   Consider how you would derive the output from two distinct inputs.

3. 3.

   What does a single-ended amplifier amplify?

   • The difference between two inputs
   • One input signal with respect to ground
   • Common mode signals

   Hint

   Focus on the number of inputs.

4. 4.

   True or False: A differential amplifier amplifies the average of two input signals.

   • True
   • False

   Hint

   Consider how each input interacts.

5. 5.

   Given two input voltages V1 = 4V and V2 = 1V, what is the output of a differential amplifier with a gain of 3?

   Hint

   Use the differential output formula.

6. 6.

   If a single-ended amplifier has an input of 6V and outputs 15V, what is the gain? Then compare this with a differential amplifier when V1 is 6V and V2 is 2V; what would you expect the output to be for a gain of 2?

   Hint

   Separately calculate gains and then the output based on inputs.