What is a Differential Amplifier (DA)?

What is a Differential Amplifier (DA)?

Answers

- Since differential amplifier (DA) is key to the operation of OP-Amp, we shall discuss this circuit in detail.
- In these conventional amplifiers, the signal (generally single input) is applied at the input terminals and amplified output is obtained at the output terminals. However, we can design an amplifier circuit that accepts two input signals and amplifies the difference between these two signals. Such an amplifier is called a differential amplifier (DA).
- The name is appropriate because the amplifier is amplifying the difference between the two input signals.
- Fig. 7.2 shows the block diagram of an ordinary amplifier. The input voltage v is amplified to Av where A is the voltage gain of the amplifier. Therefore, the output voltage is v₀ = Av.

- Fig. 7.3 shows the block diagram of a differential amplifier. There are two input voltages v₁ and v₂. The output voltage is v₀ = A(v₁ – v₂) where A is the voltage gain of the amplifier.

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Wilfykil answered the question on August 15, 2019 at 13:17

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