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Step 1 of 2 7.009E Consider PMOS and NMOS transistors have equal 8m for the same bias condition. As the bias conditions are same, then trans-conductance for PMOS and NMOS are equal, since, drain currents are equal. Drain current for P-channel device operates in saturation mode is, Substitute for µ, in the above expression. (1) Drain current for n-channel device operates in saturation mode is, (2) Step 2 of 2 Divide equation (1) with (2) 2.5 Therefore, the ratio of the width of a PMOS transistor to an NMOS transistor is 2.5