For the feedback circuit in Fig. 12.46, C₁= C₂= 4 pF. The op amp is the folded-cascode amplifier in Fig. 12.40 with low-frequency gain a_dm0 = 1280 and g_m1= 30 mA/V. What value of C_Lwill give ω_Ï„= 1.0 Grad/s for the unity-gain frequency of the differential-mode return ratio?

Fig. 12.46:

Fig. 12.40:

BiasE BiasE 2 C2 CL Vo1 01 V,1 CMC V od 92 o VBB 2 V sd 1 V02 C1 C1 V32 42 C2 $2 BiasE BiasE VpD M12 M11 BiasB M2A M1A BiasC Vo1 Vo2 V1 M1 M2 M4A BiasD BiasA M4 CMC M5 M6