Question

What are the advantages of Differential amplifiers?

Answer 1

Hint: Differential amplifiers offer lots of advantages for manipulating differential signals. It provides immunity to external noise and a 6-dB increase in dynamic range, which is a clear advantage for low-voltage systems and also reduces secondary harmonics. It is one way of implementing differential signaling and it has been a common design approach for audio, data transmission, and telephone systems.

Complete step by step answer:
Differential amplifiers are used by professional audio engineers who use the term “balanced” to refer to differential signal transmission. The driver has balanced outputs, and the line has balanced characteristics. Then the receiver has balanced inputs. Differential signaling is also becoming popular in high-speed data acquisition. The differential amplifier is necessary to properly drive inputs.
Advantage of differential amplifier:
Differential amplifiers provide increase noise immunity:
When using differential amplifiers, it responds to the only difference signal between input terminals and also ignores all common-mode signals such as noise pick–up and the ground voltage.

In the given figure, the signal travels, noise invariably couples into the wiring. In a differential system, keeping the transport wires as close as possible to one another makes the noise coupled into the conductors appear as a common-mode voltage, because differential amplifiers reject common-mode voltage, the system is more immune to the external noise. Due to the change in phase between the differential outputs, the dynamic range is two more than a single-ended output with the same voltage swing. An integrated fully differential amplifier is similar in architecture to a standard voltage-feedback op-amp. Both types of amplifiers have differential inputs.
Drift immunity:
One major problem that arises in amplifiers is a change in voltage levels or value by the effect of temperature. The changes occur slowly and are known as drift. Differential amplifiers exhibit the ability to eliminate the problem of drift.

Note: A differential amplifier helps to increase CMRR and it helps to avoid unwanted signals that couple input to get propagated.
The external inference can be reduced with the help of a differential amplifier.
The nature of the differential amplifier is linear.
It is used to increase the rejection mode to reduce unwanted signals.