In-phase noise suppression circuit capable of simultaneously transmitting N-1 sets of signals while suppressing the in-phase noise generated in transmission process

An in-phase noise suppression circuit includes a signal transmission part and a grounding part. The signal transmission part includes N (N ≥ 3) signal transmission circuits. Each of the signal transmission circuits has an input end and an output end, and is used to output a level signal inputted by each of the input ends to the corresponding output end. The grounding part includes a grounding circuit electrically coupled to the signal transmission part. When being transmitted in the N signal transmission circuits, the level signals inputted by the input ends will generate N-1 signal modes and an in-phase noise, and the signal transmission part and the grounding circuit collectively constitute a noise suppression circuit to suppress the in-phase noise generated in the N signal transmission circuits.