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How can we reduce the number of MOSFET’s in the following circuit?

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How can we reduce the number of MOSFET’s in the following circuit?

(a) Scale the aspect ratio

(b) Increase the transconductance

(c) Increase the Power supply

(d) Not possible

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Enquiry is from MOSFET Amplifier with CG Configuration topic in section FET Amplifiers of Analog Circuits

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Right option is (a) Scale the aspect ratio

The explanation is: increasing the transconductance or power supply is possible but we need to increase our power budget for both situations which is not possible. However, we can increase the aspect ratio of one MOSFET. This is because the total current entering into R1 is a sum of the currents originating from the drain of each MOSFET and they are equal to each other. Hence, scaling the aspect ratio is a plausible situation.

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