US Patent No. 11,115,020

SIGNAL TRANSMISSION CIRCUIT DEVICE, SEMICONDUCTOR DEVICE, METHOD AND APPARATUS FOR INSPECTING SEMICONDUCTOR DEVICE, SIGNAL TRANSMISSION DEVICE, AND MOTOR DRIVE APPARATUS USING SIGNAL TRANSMISSION DEVICE


Patent No. 11,115,020
Issue Date September 07, 2021
Title Signal Transmission Circuit Device, Semiconductor Device, Method And Apparatus For Inspecting Semiconductor Device, Signal Transmission Device, And Motor Drive Apparatus Using Signal Transmission Device
Inventorship Daiki Yanagishima, Kyoto (JP)
Toshiyuki Ishikawa, Kyoto (JP)
Hirotaka Takihara, Kyoto (JP)
Assignee Rohm Co., Ltd., Kyoto (JP)

Claim of US Patent No. 11,115,020


1. A signal transmission device comprising:a signal transmission chip; and
a first lead frame supporting the signal transmission chip,
wherein the signal transmission chip comprises:a first inductor spiral ring;
a second inductor spiral ring;
a first bonding pad electrically coupled between the first inductor spiral ring and the second inductor spiral ring;
a guard ring provided to roundly cover the first inductor spiral ring and the second inductor spiral ring in a plan view; and
a plurality of bonding pads provided outside of the guard ring;

wherein a direction of rotation between the first inductor spiral ring and the second inductor spiral ring are different from each other so that the first and second inductor spiral rings are disposed substantially symmetrically about the first bonding pad, and no bonding pad is provided at a first side of the signal transmission chip,
wherein the signal transmission device further comprises a semiconductor chip and a second lead frame supporting the semiconductor chip, wherein the signal transmission chip and the semiconductor chip are placed to face each other.