公开(公告)号：US20240235900A1

公开(公告)日：2024-07-11

申请号：US18561655

申请日：2022-02-02

Applicant: Hitachi Astemo, Ltd.

Inventor： Yusuke WACHI ,  Takayasu NORIMATSU

IPC: H04L25/02 ,  H04B3/14

CPC classification number: H04L25/0272 ,  H04B3/146

Abstract: Provided is a technique of power superposition differential data transmission with low radiation noise at low cost and capable of operating at a radio frequency. A differential transmission board superimposes DC power on a differential data signal from a transmission/reception IC and then transmits the signal to a cable, and includes: a first differential transmission line including two wiring patterns; a second differential transmission line including two wiring patterns; two DC transmission lines that transmit the DC power; two capacitor elements that cut off the DC power and pass only the differential data signal; and two inductor elements that cut off a radio-frequency component that is the differential data signal and pass only a DC component, in which the first differential transmission line and the second differential transmission line are connected in series, in which the two capacitor elements are connected in series to the second differential transmission line, in which the second differential transmission line and the DC transmission line are connected via the two inductor elements, and in which a characteristic impedance in a differential mode of the first differential transmission line and a characteristic impedance in the differential mode of the second differential transmission line are substantially equivalent, and a characteristic impedance in an in-phase mode of the second differential transmission line is higher than a characteristic impedance in the in-phase mode of the first differential transmission line.