decoder design for CMOS sensor

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el hou

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Hi all,

when I searched for a decoder design using in CMOS sensor I found the schematic shown in the picture , and this description : "The decoder used here is a simple NAND gate followed by 3 inverters for driving the row in the array (pixels matrix)."
I don't understand why he used three inverters !! And is it similar to use one inverter ?
 

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