Design007 Magazine

Design007-Sep2021

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of the product. For example, if you are doing a demo board with a new chip on it and we're only making five of them, I am going to treat it a lot differently than if I'm making 400,000 of these boards for a new product launch. ere are two different aspects of the manufacturing side you're looking at. Who else is involved with it? What are the mechanical, the electri- cal, and the physical imitations that are being put into it? ose are the big aspects that really control how you're going to flow with this. With fabrication, there's an interesting game to play: Many people send off the preliminary data to fab for an initial DFM. I don't do it very oen. e reason is because the fab shops are very low-margin businesses, and they are moving very, very quickly. When you send preliminary data to the fab shop and ask for a DFM, they're going to say, "Sure," and you get what comes out of their CAM tool and nothing more. en when they start to tool it up and the CAM engineers really look at the data and read the notes, they oen come back with, "We can't quite do this," "is doesn't quite work," or "Can you change this?" is is because, while space and trace issues are easy to find and fix, there are a lot of other issues that take a deep dive into the data to figure out. Please keep in mind, this is not all shops; there are a few out there that do it right, but not many. So, how do you shorten that cycle? You have all the DFM rules in the CAD tools so there is no question whether the board can be built. at is what Cadence has done with DesignTrue. Matties: I hear a lot of people say that if more design engineers used simulation, it would streamline that process and maybe eliminate

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