Question: Consider the CMFB network in Fig. 9.51. The amplifier sensing Vout,CM is to be implemented as a different pair with active current mirror load.

Consider the CMFB network in Fig. 9.51. The amplifier sensing Vout,CM is 

Consider the CMFB network in Fig. 9.51. The amplifier sensing Vout,CM is to be implemented as a different pair with active current mirror load. (a) Should the input pair of the amplifier use PMOS devices or NMOS devices? (b) Calculate the loop gain for the CMFB network. Figure 9.51 Sensing and controlling output CM level. VDD R1 R2 Voutto o Vout2 M M2 Vout,CM Vin Is V. VREF M3 M4

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