4.19. For the device of Prob. 4.1 in weak inversion, plot (a) Ips vs. Vps, with VSB = 0, for Vps - between 0 and 0.5 V, and for VGs values

of VM - 50 mV and VM - 100 mV. Use (4.8.6) and (4.8.7); (b) log Ips vs. Vcs with Vps = 1 V, for VSB = 0 V and VSB = 0.5 V.