Sughrue, Mion, Zinn, Macpeak and Seas
Semiconductor integrated circuit device having ground connections arranged to eliminate mutual interference between island-disposed electronic circuits
 A semiconductor integrated circuit contains a plurality of electronic circuit portions formed thereon, each of which includes an earth wiring. Mutual interference between the circuit portions is reduced by connecting the earth wirings to a common earth electrode, and connecting only a part of the earth wirings to an earth point of the semiconductor substrate. 
Mitsubishi Denki Kabushiki Kaisha
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Hajime Hiromitsu
Takano Yamashita