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Change in value of common mode input signal in differential pair amplifier make

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in Linear Integrated Circuits by (37.1k points)
Change in value of common mode input signal in differential pair amplifier make

(a) Change in voltage across collector

(b) Slight change in collector voltage

(c) Collector voltage decreases to zero

(d) None of the mentioned

I have been asked this question during an interview for a job.

The query is from Operational Amplifier Internal Circuit in chapter Operational Amplifier of Linear Integrated Circuits

1 Answer

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by (39.8k points)
The accurate option is (a) Change in voltage across collector

Unravel the mysteries with: In differential amplifier due to symmetry, both transistors are biased and matched. Therefore, Voltage at each collector will be same.

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