Differential Amplifier

Differential Amplifier

• All operational amplifiers (op-amps) are differential amplifiers because of their input configuration. When the first voltage signal is connected to the input terminal and another voltage signal is connected onto the opposite input terminal then the resultant output voltage is proportional to the difference between the two input voltage signals of V1 and V2. The output voltage can be solved by connecting each i/p intern to 0v ground using a superposition theorem.

Differential Amplifier

By connecting each input in turn to 0v ground we can use superposition to solve for the output voltage Vout. Then the transfer function for a Differential Amplifier circuit is given as:

Differential Amplifier – Bias

Differential Amplifier – Bias

Differential Amplifier – Gain

Differential Amplifier – Gain

Differential Amplifier – Common Mode (1)

Differential Amplifier – Common Mode (1)

Differential Amplifier – Common Mode (2)

Differential Amplifier – Common Mode (2)

Differential Amplifier – Common Mode (3)

Differential Amplifier – Common Mode (3)

Differential Amplifier – Differential Mode (1)

Differential Amplifier – Differential Mode (1)

Differential Amplifier – Differential Mode (2)

Differential Amplifier – Differential Mode (2)

Why are Differential Amplifiers popular?

Why are Differential Amplifiers popular?

Why is a large CMRR useful?

Why is a large CMRR useful?

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