GaAs multichip module for a parallel processing system

Takeshi Miyagi, Kenji Itoh, Susuma Kimijima, Toshio Sudo

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


A high-speed data transfer network for a parallel processing system has been developed on the basis of multichip packaging technology. The high-speed data transfer network connecting multiple processor units (PUs) has been achieved in a module using 8 bit-slice GaAs bus logic (BL) LSIs operating at 100 MHz. The GaAs multichip module consists of 12 GaAs BL LSIs in a 3 × 4 matrix. Each GaAs chip is sealed in a chip carrier with bumps. The chip carrier is flip-chip bonded to the copper/polyimide thin-film multilayer substrate. The characteristic impedance of the signal lines on the module is controlled to 75 Ω to be compatible with the GaAs original interface level. The thin-film termination resistors are made of Ni/Cr in the substrate to prevent reflections. A total power dissipation of 90 W of the module was efficiently radiated by a newly developed heat-pipe cooling module at 2-m/s air flow velocity with low acoustical noise. The total thermal resistance from the chip to the ambient medium was approximately 3°C/W. A 3-Gb/s data transfer rate (32 b × 100 MHz) can be realized by four stacked modules of 48 GaAs BLs.

Original languageEnglish
Pages (from-to)580-585
Number of pages6
JournalProceedings - Electronic Components and Technology Conference
Publication statusPublished - 1990
Externally publishedYes
Event1990 Proceedings of the 40th Electronic Components and Technology Conference - Las Vegas, NV, USA
Duration: 1990 May 201990 May 23

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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