US 12,245,384 B2
Signal transmission circuit and electronic control device
Yuki Nakamura, Tokyo (JP); Masahiro Toyama, Tokyo (JP); Isao Hoda, Tokyo (JP); Hiroki Funato, Tokyo (JP); Umberto Paoletti, Tokyo (JP); Hideyuki Sakamoto, Hitachinaka (JP); and Yutaka Uematsu, Tokyo (JP)
Assigned to HITACHI ASTEMO, LTD., Hitachinaka (JP)
Appl. No. 17/622,174
Filed by HITACHI ASTEMO, LTD., Hitachinaka (JP)
PCT Filed May 13, 2020, PCT No. PCT/JP2020/019163
§ 371(c)(1), (2) Date Dec. 22, 2021,
PCT Pub. No. WO2020/261790, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-116261 (JP), filed on Jun. 24, 2019.
Prior Publication US 2022/0354006 A1, Nov. 3, 2022
Int. Cl. H05K 1/18 (2006.01); H05K 5/00 (2006.01); H05K 9/00 (2006.01)
CPC H05K 5/0026 (2013.01) [H05K 1/181 (2013.01); H05K 9/0015 (2013.01); H05K 2201/10189 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A signal transmission circuit comprising:
a circuit board stored in a housing;
a coaxial connector which is mounted on the circuit board and includes a first signal terminal and a first ground terminal; and
an integrated circuit which is mounted on the circuit board and includes a second signal terminal and a second ground terminal, wherein the second signal terminal is different from the first signal terminal, and wherein the second signal terminal and the first signal terminal are oriented towards each other,
wherein
the first signal terminal and the second signal terminal are connected to each other by a signal wiring arranged on one of a plurality of layers of the circuit board,
the first ground terminal and the second ground terminal are connected to each other by a ground wiring arranged in a predetermined range including a portion immediately above or immediately below the signal wiring in the circuit board,
the first signal terminal and the first ground terminal protrude from one side of the coaxial connector,
the circuit board comprises a plurality of component mounting pads provided along the one side of the coaxial connector on a mounting surface of the coaxial connector,
the first signal terminal and the first ground terminal are each connected to at least one of the plurality of component mounting pads,
the plurality of component mounting pads further comprises at least a first component mounting pad associated with the first signal terminal and a second component mounting pad associated with the second signal terminal connected to each other via the signal wiring, and
at least a part of the ground wiring immediately above or immediately below the signal wiring has a high impedance structure formed to be wider than the signal wiring and narrower than total widths of the plurality of component mounting pads in a direction along the one side of the coaxial connector, wherein each of the first signal terminal and the first ground terminal are connected to at least one of the plurality of component mounting pads.