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What is the purpose of differential amplifier stage in internal circuit of Op-amp?

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in Linear Integrated Circuits by (37.1k points)
What is the purpose of differential amplifier stage in internal circuit of Op-amp?

(a) Low gain to differential mode signal

(b) Cancel difference mode signal

(c) Low gain to common mode signal

(d) Cancel common mode signal

The question was posed to me in unit test.

The doubt is from Operational Amplifier Internal Circuit in division Operational Amplifier of Linear Integrated Circuits

1 Answer

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by (39.8k points)
The accurate option is (d) Cancel common mode signal

Grasp the essence with: Any undesired noise, common to both of the input terminal is suppressed by differential amplifier.

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