Abstract: A self-adapting Dither structure is proposed to solve the problem of the input signals' overflow when Dither is used in the pipelined ADC. It utilizes PN as wideband and large amplitude Dither and synchronizes analog signals without changing their dynamic range. It is proved that such a structure can reduce DNL errors and improve ADC's performance. The output codeword distribution is compared before and after Dither is added in experimental findings. The distinctive impacts on ADC's performance are reported as well when different amplitude Dithers are applied.