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PCB is the acronym to Printed Circuit Board. A PCB is a carrier for the circuit's components and their electrical connections.

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A signal is usually considered high speed requiring Transmission Line methods if the length of the signal track is long compared with the highest frequency of interest in the signal. The same may be …
answered Aug 10 '15 by Peter Smith
6
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major damage to the PCB. I have some products where the use of this sealant is mandated (they are in ship-board aircraft). I only mention this to show there are solutions, if there is a requirement for … complete sealing. I would note that different PCB materials have different moisture absorbtion rates. 'Ordinary' conformal coat comes in a wide array of types, each with their own pros and cons …
answered May 6 '16 by Peter Smith
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I would not split the ground plane, but I see no issues with creating a local plane for the device. Find a ferrite that can handle the current required (they are usually available in the same package …
answered Dec 16 '15 by Peter Smith
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the minimum hole size. 3. Lots of high speed interconnect. High speed pairs work best with single layer routing (a breakout via at each end only) for a variety of reasons. Consider a PCB with 2 …
answered Jul 16 '17 by Peter Smith
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, but I have had automated X-Ray testing on boards in the past that had a very low error rate. QFP devices can catch the unwary if the PCB is tested by bed of nails or roving probe: I have seen devices …
answered Feb 28 '16 by Peter Smith
2
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In addition to the comments and answers, there are a class of analogue applications where we use a differential interface. This is usually where we have very low level signals, such as from a microph …
answered Jun 8 '16 by Peter Smith
2
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Dielectric breakdown for PCB laminates is usually tested to IPC TM-650 test method 2.5.6 for breakdowns across the material and test method 2.5.6.2 for breakdown through the material; i.e. layer to …
answered Jan 13 '16 by Peter Smith
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In the PCB view, in 2D design view: Press 'L' to bring up the View configuration dialog: Select the 'view options' tab Scroll to the bottom and you will see the view options. The ones in blue …
answered Mar 31 by Peter Smith
3
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X-ray will easily see right through the copper. This is an X-ray image of a BGA on an 18 layer board that has 6 planes: As you can see, the solder balls are clearly visible.
answered Mar 9 '16 by Peter Smith
4
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FR-4 really only means the material is flame retardent; that may seem an oversimplification, but there are many varieties of FR-4 that are specified to 10GHz. As a couple of examples, see Isola 370HR …
answered Feb 14 '17 by Peter Smith
2
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signals; I will assume for now that you do and it is spaced 5 thou away from the signals (implies a 4 layer or higher PCB). The actual distance is determined by the various requirements of the PCB; a 5 … thou core is commonly used (although many thicknesses exist). I usually use 6 thou tracks for USB high speed (a decent trade-off for skin effect and PCB real estate); the gap between the pair can now …
answered Jun 13 '16 by Peter Smith
3
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A signal with less than 10 ohms impedance will be susceptible to magnetic mode interference, and although the Ethernet pair will not radiate much common mode energy, there will still be some, and most …
answered Oct 6 '15 by Peter Smith
1
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will change layers across the PCB, remember to take the reference through the board as well. For instance, if you have a signal that transitions from layer 1 (reference layer 2) to layer 8 (reference …
answered Apr 27 '16 by Peter Smith
2
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Good layout requries proper planning of the power distribution first. To achieve this, you should plan the layout such that components that form a logical group are placed near each other; from this, …
answered Jun 4 '16 by Peter Smith
2
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When looking at PCB assembly, the price is driven primarily by the number of operations and the cost of solder stencils unless they have invested in a solder printer but even then there is going to … know, but it is a cost driver). Double sided means twice through the pick and place machine, so you will end up paying for the extra process step. You will need to trade off the cheaper raw PCB
answered Oct 12 '16 by Peter Smith

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