8.20 Consider the cascode amplifier of Fig. 8.31 with the dc component at the input, VI = 0.7 V, VG2 = 1.0 V, VG3 = 0.8 V, VG4 = 1.1 V, and VDD = 1.8 V. If all devices are matched (i.e., if kn1 = kn2 = kp3 = kp4), and have equal |Vt| of 0.5 V, what is the overdrive voltage at which the four transistors are operating? What is the allowable voltage range at the output? 0.2 V; 0.5 V to 1.3 V