Hi Ting, That's no need to add an amplifier, figure 8 is an example of the AC coupling. The AC coupling will center the input around VCLP, this is important in sample and hold mode. For CCD type the AC is needed just for the common mode voltage. If needed in sample hold mode of operation and internal source follower can be added. You can find a detailed description in data sheet 7.3 section Regards, Costin
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