5. (15%) Fig. 5 shows that the common-source stage provides a voltage gain of 10 with a bias current of \( 0.5\mathrm{mA} \). Assume \( \lambda{1} = \lambda{2} = 0.1\mathrm{V}^{-1} \), \( V{\mathrm{in}} = |V{\mathrm{ip}}| = 0.4\mathrm{V} \), and \( \mu{\mathrm{e}}C{ox,n} = 2\mu{\mathrm{p}}C{ox,p} = 200\mu \mathrm{A} / \mathrm{V}^2 \) (a) Compute the required value of \( (W / L)1 \). (b) If \( (W / L)2 = 10 \), calculate required dc bias of \( V_{b} \).