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[Author] Hiroshi TAZAWA(1hit)

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  • A 48-Lead Film Carrier for Ultra-High Speed GaAs Digital Integrated Circuits

    Chiaki TAKUBO  Hiroshi TAZAWA  Mamoru SAKAKI  Yoshiharu TSUBOI  Masao MOCHIZUKI  Hirohiko IZUMI  

     
    PAPER

      Vol:
    E75-C No:10
      Page(s):
    1172-1178

    A film carrier with 48 peripheral-contacts, which is applicable to ultra-high speed GaAs digital integrated circuits (ICs) with a more than 10 Gbps operation, has been developed. The film carrier has been realized using the following newly developed techniques; (1) wave guides with a well-controlled characteristic impedance of 50 Ω, (2) precise vias of as small as 50 µm diameter conducting both sides of grounded metal planes on a polyimide film, and (3) a feed-through structure for high speed input signals with good impedance matching. The film carrier was molded by resin after ILB (inner lead bonding) to a chip with a copper plate heat spreader. As an application, the film carrier has been applied to a 3 Gbps operational 4-bit GaAs multiplexer IC, and has been proved to have excellent high-frequency characteristics.