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Why active load is used in amplifier to obtain large gain in intermediate stage of amplifier?

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+1 vote
in Linear Integrated Circuits by (37.1k points)
Why active load is used in amplifier to obtain large gain in intermediate stage of amplifier?

(a) To obtain a very large voltage gain

(b) To get High input resistance

(c) To reduce the noises

(d) To increase current gain

I have been asked this question in an interview for job.

My doubt stems 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 choice is (a) To obtain a very large voltage gain

Simply put: To increase gain usually large collector resistance value as gain is proportional to load resistor. However, due to limitation of maximum value load resistor, active loads are used in amplifier to obtain large gain in intermediate stages of amplifier.

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