Question: Calculate the common-mode input range of the folded-cascode op amp in Fig. 6.28. Assume that all the transistors are enhancement-mode devices with |V t |=1

Calculate the common-mode input range of the folded-cascode op amp in Fig. 6.28. Assume that all the transistors are enhancement-mode devices with |V_t|=1 V, and ignore the body effect. Also assume that the biasing is arranged so that |V_ov|=0.2 V for each transistor. Finally, assume that M₁₁and M₁₂are biased at the edge of the active region.

Figure 6.28

VDp VBIAS1 M4 Mз M5 MẠA Мзл Vị M2 M1 CL VBIAS2 УBIAS? Мал M1A УBIAS3 УBIAS3 M12 M11 -Vss

VDp VBIAS1 M4 M M5 MA V M2 M1 CL VBIAS2 BIAS? M1A BIAS3 BIAS3 M12 M11 -Vss

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