ECE315_Diff1

What is the primary function of a differential amplifier?

• To convert AC signals to DC

• To filter out noise from a signal

• To amplify the difference between two input signals

• To amplify a single-ended signal

What is the effect of applying common-mode signals to an ideal differential amplifier?

• It increases the gain

• It decreases the input impedance

• It produces zero differential output

• It enhances the output

In a BJT differential pair, the linear region is determined by ......

• the supply voltage

• the tail current

• the Early voltage

• the thermal voltage

For the same power consumption, the gain of a differential amplifier is equal to ......

• half the gain of the CE amplifier

• the gain of the CE amplifier

• double the gain of the CE amplifier

What happens when you increase the common mode of the input?

• The tail current decreases

• The output common-mode voltage changes

• The differential gain increases

• The output swing decreases