Abstract: An in-phase noise suppression device includes a signal transmitting unit and a grounding unit. The signal transmitting unit includes a number (N) of signal transmitting circuits, where N?3. Each of the signal transmitting circuits has an input terminal and an output terminal, receives a level signal at the input terminal thereof, and outputs the level signal at the output terminal thereof. The grounding unit includes a grounding circuit that is connected to the signal transmitting unit. The level signals respectively received by the signal transmitting circuits at the input terminals thereof, when being respectively transmitted along the signal transmitting circuits, generate at least two balanced digital signals and in-phase noise. The signal transmitting unit and the grounding circuit cooperatively constitute a noise suppression device so as to suppress the in-phase noise generated in the signal transmitting circuits.

Abstract: A common-mode noise filter is provided, and comprises a first transmission structure and a second transmission structure. At least one first transmission unit is connected between a first signal input end and a first signal output end of the first transmission structure in series. At least one second transmission unit is connected between a second signal input end and a second signal output end of the second transmission structure in series. Two first capacitors are connected between the first signal input end and the second signal input end in series, and connected at a first node together. A first common-mode noise suppression unit is connected between the first node and a reference potential, and comprises a second capacitor and a first lossy element connected to the second capacitor in series or parallel. The first common-mode noise suppression unit can absorb a common-mode noise via the first lossy element.