(Solved): 9.14. The cascode current source shown in Fig. \( 9.48 \) must be designed for a bias current of \( ...

9.14. The cascode current source shown in Fig. \( 9.48 \) must be designed for a bias current of \( 0.5 \mathrm{~mA} \). Assume \( \mu_{n} C_{o x}=100 \mu \mathrm{A} / \mathrm{V}^{2} \) and \( V_{T H}=0.4 \mathrm{~V} \). (a) Neglecting channel-length modulation, compute the required value of \( V_{b 2} \). What is the minimum tolerable value of \( V_{b 1} \) if \( M_{2} \) must remain in saturation? (b) Assuming \( \lambda=0.1 \mathrm{~V}^{-1} \), calculate the output impedance of the circuit. Figure \( 9.48 \)