Determine the Number of Transistors Needed to Build CMOS circuit

cmosmultiplexertransistors

I would like to determine the number of transistors that will be used in the CMOS circuit below. Is there a specific formula for it?

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Best Answer

The above problem can be solved by using TG We have 3 inputs now for sake of less number of MOS to be used lets get \$x_1 x_2 x_3\$ in true logic as well as inverted logic

So MOS needed for 3 inverters is \$ 3 \times 2 = 6\$

now all we need are 3 TG to be implemented NOTE: since we already have inverted logic form of \$x_1 x_2 x_3\$ we don't need inverters again Thus to implement 3 TG we need \$ 3 \times 2 = 6\$ MOS

Thus total \$ 6 +\ 6=12 \$ MOS needed

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