[24 minutes] 9.1 [30 points] +1.75 V o VDD = +2.5 V iii. gm for each transistor. iv. To and Ag for each transistor assuming |V|= 5V. v. The de voltage at the drains of Q1 and Q2. (b) Find the input common-mode range. [6 points] (c) With VG1 = vid/2 and G2 =-vid/2, where [10 points] Vid <<2 Vov, give the differential half-circuit and use it to determine the differential gain vod/Vid +1.5 Vo 10- es 9.2 -02 +0.75 Vo- Q4 23 VIGI+ Q2 1=50 μAVcs 112 G VDD (W/L) (2W/L) (W/L) (W/L) Qs 26 210 21 [24 minutes] [15 points] Figure 9.1.1 -Vss=-2.5 V For the differential cascode amplifier in Fig. 9.1.1, all the transistors have the same threshold volt- age IV = 0.5V and are operating at the same overdrive voltage. For the purpose of calculat- ing de quantities, neglect the Early effect. The current source / requires a minimum de voltage Vcs = 0.25 V for its proper operation. [14 points] (a) With VGI G2 =0V, find: i. The bias current in each of the eight transistors. ii. Vovl for each of the eight transistors. Figure 9.2.1 Q9 -VSS The differential amplifier in Fig. 9.2.1 utilizes current-source loads and is biased with a modified Wilson current mirror. All transistors are operated at the same overdrive voltage Vovl=0.2 V and have equal Early voltage, |V|=4V. (a) Find the differential gain. [5 points] (b) Find the CMRR (in dB) assuming that the [7 points] 9-1 Sedra | Examination Questions for Microelectronic Circuits, Eighth Edition Oxford University Press 2020

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