Among its principal purposes, the next ExoMars mission aims to the study of the martian climate and planetary boundary layer. The mission lander hosts the sensor MicroMED aimed to monitor the dust embedded into the atmosphere. This work presents the study of the MicroMED noise characteristics and the techniques adopted to filter the resulting false positive detections. In particular, it shows a simple algorithm able to optimize the instrument performances, when both an AC and DC signal interferences are involved.