![]() ![]() the design.Board cutouts are not exported in Gerber file export. This article shows how to generate outlines for the cutouts onto a mechanical layer for documentation and inclusion in the fabrication output files. Sorry if I made any clearly wrong assumptions, and please let me know any other suggestions you might have reg. Does it mean that I should design with the calculator for 50 Ohm single-ended, and then just space traces enough (how much?) that differential is only 2x those 50 Ohms? Or otherwise, since it seems that the calculator is already taking through-GND impedance into account, shall I choose widths and spacing so that both 100 Ohm differential and 50 Ohm single-ended are achieved at the same time? If so however, what will make it a loosely coupled pair? My question is: from my understanding, loosely coupled pair achieves its differential impedance via ground plane (rather than actual coupling between traces), and has it as 2x the single-eneded impedance. ![]() I will be ordering a prototype from JLCPCB, and use their impedance calculator to check what trace width and spacing should be set to. I have designed a few PCBs, but never any involving controlled impedance traces, and my knowledge about them comes from the past few days reading theory. ![]() The differential pairs should be loosely coupledĭistance between pairs should be (traces on top layer = microstrip) 4 times the layer spacing ![]() Table below sums them up (it is taken from NVIDIA Jetson Nano Product Design Guide and probably follows those from MIPI specification):įrom it, apart from making all traces the same length from camera sensor to cable connector, I believe the rules I need to follow are: It will have 4-lane MIPI CSI interface, which must meet specific routing requirements. Hi, I am trying to design a PCB for a camera module, with the intention to use it with Jetson Nano. ![]()
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