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Detection of separation point on the surface of delta wing is of great interest for the unmanned aerial vehicles' design and application. To obtain such information, a mixed-signal system has to be implemented. In this paper, the digital blocks of the mixed-signal system were designed. Two types of comb filter, which is an important part of digital blocks, were compared in area and power. The non-recursive comb filter was adopted. A more reasonable and efficient verification of the whole mixed-signal system was obtained by using ADMS.