a channel module comprising a plurality of sampling channels, wherein each of the plurality of sampling channels is configured to receive an analog signal;

a timing-control module configured to provide a plurality of candidate sequences for a same sampling channel among the plurality of sampling channels, wherein the plurality of candidate sequences comprise a first sequence and a second sequence, and the timing-control module sets a first sampling time corresponding to the first sequence and sets a second sampling time corresponding to the second sequence; and

a conversion module electrically coupled to the timing-control module and the channel module, wherein the conversion module is configured to convert the analog signal from the same sampling channel into a digital signal in response to an order and sampling times that are defined by the plurality of candidate sequences.