1. You are working at a fabless company, and need to find a foundry to make 3,000 chips. This is a small production run. You talk to two potential vendors. Vendor A says that they are using a slightly older, more mature, technology on 200 mm diameter wafers, with a defect density of only 0.2 cm? You estimate you will need 1 cm' of area to make a single die using their process. The photomask cost (one-time cost) is $50,000. The cost per wafer is $3,000. Vendor B is using a newer process (1 generation newer) with 300 mm diameter wafers. The feature size for Vendor B is 0.7x the feature size for Vendor A, so each die takes up V the area. However, their defect density is 0.4 cm (2x higher), the wafer cost is $6,000 (2x higher), and the photomask cost is higher ($200,000). A) Fill in the following table. Vendor A Vendor B Photomask cost Wafer diameter Wafer cost Defect density Chip Area #chips / wafer Yield #good chips / wafer # wafers required (round up) Total run cost (wafers + photomask) Cost per chip (Total run cost/3,000 chips) B) Which vendor would you choose for the initial run? 9.7 Problems 1. You are working at a fabless company, and need to find a foundry to make 10,000 chips. You talk to two potential vendors. Company A says that they are using a slightly older, more mature, technology on 200 mm diameter wafers, with a defect density of only 0.2 cm2. You estimate you will need 0.5 cm of area to make a single chip using their process. The initial photomask cost (one-time cost) is $100,000. The cost per wafer is $2,000. Company B is using a newer process (2 generations newer) with 300 mm diameter wafers. However, their defect rate is 10x higher than for company #2, the wafer cost is 3x higher, and the initial mask cost is 3x higher. A) Fill in the following table. Company A Company B Photomask cost Wafer diameter Wafer cost Defect density Chip Area #chips / wafer Yield # good chips / wafer # wafers required Total cost (wafer + photomask) Cost per chip B) Which vendor would you choose for the initial run