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Layout Digital Matching

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7 Threads found on edaboard.com: Layout Digital Matching
hi there ! i have some questions for analog layout , could anyone can help me to explain or make it insight Why need match Why need same length Why need unit width to replicate Why need dummy Why need shielding Why care parasitic Why need seal ring Why top metal is immune to antenna effect many thank in advance
Hi, I am new to PCB design and have to make PCB having digital clock paths for 5GHz. Can somebody suggest some basic tutorial about layout techniques for mixed singal PCBs and broadband impedance matching techniques for digital clock. How i will be able to calculate width of trace for certain impedance. regards
There are 2 kinds of layout - one is full custom layout, usually for analog designs; the other one is standard cell layout, the layout for digital design. Both are equally challenging, in different way. Full custom layout engineer needs good knowledge of the process, circuit design and (...)
Professional PCB layout: - High Speed digital, Analog, Mixed, Video, RF and High Voltage designs - High Speed Interconnects: 3.125 Gbps - Impedance/Delay matching - Layer count boards: up to 22 layers - High Density PCBs: > 400 pins / Sq.inch - Fine Pitch BGA (0.5mm), High Pin count BGA (1148 pins) - Evaluation and Customers
I think digital layout can use apr, only timing, power and area need take care; but analog layout should take care to current, matching, noise, ESD and parasitics. So an analog layout engineer need more experience.
Hi, The main reason you need to think about mask shift is for matching. 45 degree angle for gates is used in digital layout. You don't really need to take care of matching in digital. And by the way I don't think a mask shift would be big enough to not process poly over the desired active area. That (...)
As far as I know : For digital : it is spare cells, i.e unused cells added before P&R. They are to used in case of new P&R to change only metal layer, or in case of FIB For analog layout : these are unused structure that mimic a critical structure to improve its matching (for example, dummy capacitors on each side of a (...)