Repeat 12.1 for the two-stage op amp in Fig. 12.23. Assume that switched-capacitor CMFB is used, which does not limit the output swing. Use the data in Problem 12.1.

Data from Prob. 12.1:

What are the swing limits for each output of the differential amplifier in Fig. 12.2? Use |V_ov| = 0.2 V for all transistors and V_tn = ˆ’V_tp = 0.6 V. Assume V_DD = V_SS = 2.5 V, V_ic = 0 and γ = 0. Also, assume that the common-mode feedback circuit does not limit the output swing. What value of V_OC gives the largest symmetric differential output swing? What is the peak value of V_od in this case?

Fig. 12.23:

Transcribed Image Text:

VDD Vвt Vв1 M7 Veme HCM5 M10 -o Vo1 Vo2 M2 Vло M1 Va- V вe м M6 M4 M9 -Vss