Questions tagged [pcb-layers]

Printed Circuit Boards (PCBs) are composed of a sandwich of alternating layers of insulating substrate and conducting copper layers. The copper layers are etched to form connecting tracks between components as well as earth/ground or power planes. The simplest PCB has one substrate layer and one copper layer. Generally only the copper layers are counted. A complex PCB might have seven layers.

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58 views

PCB 4-Layer Cap Construction, Prepregs Mechanical strength

I am trying to construct a 4-Layer board for RF application. I have decided to use Rogers RO4350 material due to the high frequency signals on the top layer. I have also considered to combine Rogers ...
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3answers
103 views

Question about proper PCB stack-up

I've got some question about stack-up for 4 layer PCB. My design is rather simple but due to many connections all arround PCB it couldn't be made with 2 layer PCB, this is why I picked 4 layer board. ...
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71 views

Why is the signal-power-signal-ground 4 layer PCB stack frowned upon?

Commonly, the best practice 4-layer PCB stack up is (from top to bottom) signal-ground-power-signal. That keeps the signal layers close to a reference plane, and ...
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30 views

Switching Top and Bottom Layers in Altium?

I was doing a 4-layer PCB, but after submitting for a quote I realized it would be much cheaper to make a 2-layer board and I didn't really need a 4-layer board for the time being. When I was trying ...
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69 views

High current over 5V on PCB panes instead of track

I have leds running for around 600 Watts of 5V leds (120 amps). The source of the power are three 48V to 5V converters which each can handle 200 watts. If I would run this amount of Amps over my PCB ...
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47 views

Is there a way to prevent switching layers when laying tracks in KiCAD?

When I lay tracks in KiCAD on the back Cu layer (v5.1.0, Windows) I have the front Cu layer toggled invisible in the layer manager. I also have the selector arrow set to the back Cu layer. I have ...
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81 views

Gerber viewer confusion - missing traces

I'm not sure about my gerber files. I guess there is something wrong. In different gerber viewers the PCB looks right. But in online viewers from JLCPCB and PCBway, the bottom view looks wrong. Some ...
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47 views

Marking 3U board size on a 6U board in Altium

I have an Altium design of a board which is 6U size. I want to mark 3U size on it using some line-drawing. As I don't have hands-on on Altium so struggling to do it. How to know the size in Altium as ...
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71 views

Power planes in PCB

I'm designing my first PCB (two layer), the project is for an amplifier based on OPA2134. The design/amplifier requires to have +12V, GND and -12V. The power for the amplifier comes from a ...
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74 views

Is a ground plane meaningful even where the signal return path is not through ground?

I'm designing a two layer PCB for a keyboard where most of the board space is taken up by the key switches and backlight LEDs. The switches have a traditional switch matrix configuration with diodes ...
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413 views

What are the advantages and disadvantages of Manhattan-Style routing?

Manhattan-Style routing being the use of expressly east-west planes and north-south planes, using a via and changing planes when a signal changes direction. Comparing to freestyle routing, which lets ...
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43 views

Eagle automatically making connections to layers of PCB?

I'm designing a 4 layer PCB, using positive and negative power planes along with a ground plane and a top signal layer. While making the schematic I've notice strange little Xs in some of the through ...
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127 views

PCB Stack up 4 layer Micro vias, Stacked Vias and Buried Vias

I am designing a 4 layer board in which I HAVE to use blind and buried vias. This is a very dense board with (SOLID COPPER ON LAYER 4, No exceptions ) I am planning to use 1.) 1-2 microvia and 2-3 ...
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73 views

Do I need a ground polygon for analog design?

I have an analog circuit with few opamps (max freq. 500Hz) and a DC-DC converter with 500 kHz frequency for power supply. It seems I need to use both sides of PCB for components and routing if I use 2 ...
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1answer
40 views

Eagle component has mixed tPlace and tDocu drawings

I'm designing a board with Eagle and I have placed some LEDs from the led library that comes with Eagle. With the default layers activated, the LED looks correct in the Board (the anode and cathode ...
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96 views

Altium 19 stack manager and Gerber file setup

I have installed Altium Designer 19 recently but I have two problems with this version: First of all, when I open the layer stack manager I can not see "save and load and advance" at bottom. I don't ...
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57 views

Move part to bottom layer without mirroring in Eagle

How can I move a SMD part in Eagle to the bottom layer without using mirror? The resulting PCB should have the SMD pads on the bottom layer but mirrored (if you turn the PCB and look on it from top ...
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62 views

Keep out zone of microSD card set footprint

I'm designing a PCB with Hirose microSD card set DM3AT-SF-PEJM5. In its datasheet, page 3, there are several "no conductive traces" area, which are marked as "keep out" zone in the footprint I found. ...
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132 views

How are complicated PCBs designed? [closed]

Firstly, I've always wondered how do engineers calculate the right parameters of components (caps, resistors, inductors, ...) in big projects, such as mobile motherboards and etc. It feels rather ...
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104 views

Compare (Diff) ODB++ Files

A few years ago I was making layout changes to a PCB and wanted to be 100% sure that one particular interface did not change at all. My layout contractor generated an ODB++ compare file (I would also ...
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40 views

Checkered / square-patterned copper plane on a PCB [duplicate]

The Verge has published photos of the original iPhone "dev kit". The board looks like an ordinary development kit to me, however there is a strange pattern of squares on the topmost layer. I know ...
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197 views

Best layer stack strategy for a 6 layer PCB with mostly SMD components

I am doing a design in a 6 layer PCB where both sides are populated. 95% of the components are SMD. The design is not "High Frequency" in terms of signal speeds....the fastest thing here is a MCU with ...
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1answer
86 views

Having different voltage potentials as power planes on the same inner layer of a PCB

I am working on a 6 layer job which placement of the given components in the rather limited area that I have to work with...is driving me a bit crazy. I have no option but to have 2 different voltage ...
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1answer
117 views

PCB stackup ambigous percent number

In this stack-up what are those presented in right-side of picture? update: The person who respond from manufacturer told me that is "residual copper ratio". But I think she is misunderstood because ...
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140 views

Shaping ground plane on a 4 layer USB Midi controller PCB

I have asked about this before but I have to admit that I didn't read enough before asking and therefore was'nt able to ask the question properly. I hope I am now. I'm designing a 4 layer board with ...
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222 views

(Not) Impossible to separate AGND from DGND

I'm designing a USB-MIDI board and I decided to go for 4 layers. Since the digital and analog inputs (i.e. potentiometers and momentary push buttons) are distributed throughout the board, it's ...
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2answers
165 views

Routing traces over traces in two layer pcb

I am kind of new to PCB Design. I have a few confusions on my board layout, in order to reduce EMI in routing. I am designing a two-layer PCB design I am aware that when you route traces over ...
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47 views

Strange powerplane layering issue in designspark

I'm trying to order a 6 layer PCB from a fab but they are asking me to resolve an issue with the file and I'm a bit stumped on what to do about it. The second layer of the design I have designated as ...
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108 views

power planes star connection

I have only one layer for +5V and -5V power lines on pcb. There are about 10 dual supply OPAMPS which get power from Recom RKZ0505D DCDC converter. As I know, star topology is suitable for this. PCB ...
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95 views

Eagle - 6 Layer Via pairing error + bga fanout

I'm trying to manually fanout 5 bga's on my 6 layer board. Tried using Eagle's default Auto BGA router and kept coming up with problems regarding my additional layers being used but not enabled, I ...
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324 views

shortcut to change layer/add via while routing in Altium doesn' t work

I'm trying to change my tracks during routing to pass from bottom to the top, or from top to bottom using +/- buttons, but neither numerical buttons neither +/- buttons from keyboard buttons are doing ...
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26 views

Split Power Plane when using Load Switches?

To do power saving for a battery operated product, I am using couple of load switches to shut down peripheral power when not using that. PCB stackup - Signal(component), Gnd, Power, Signal -- 4 ...
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1answer
93 views

Ground plane: is there a tool to identify choke points of a fragmented copper polygon in Eagle?

As they say a picture says a thousand words. Consider this extreme example: You have this copper polygon (a ground plane), but due to other signals routed on the same layer, the polygon comes to a ...
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79 views

Does a Vcc layer cause noise to a 4-layer RF PCB?

I'm designing a 4 layer GPS tracker PCB with the 2nd layer as ground and 3rd as Vcc. Is this a good practice? I know a gnd layer is good but I'm not sure how to distribute the positive of the supply ...
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86 views

4 Layer board with high current return path inner layer

So I am doing a layout for a 4 layer PCB 1 ounce/layer. The Chip supports up to 20A (motor controller driver). The application needs about 12 amps max ( I plan it let it go up to 17A in the event of ...
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1answer
697 views

Altium Designer: mixed mechanical layers on Top and Bottom Layer Pair

I have a multilayer board I'm working with. To ease placement and routing, I created some layer pairs and two Layer Set (TOPSet, BottomSet) and then I clicked on hide/show button to assign meaningful ...
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248 views

Is the solder paste file necessary for through-hole components?

I have designed a PCB. There are only through hole components on the top layer, and only surface mount components on the bottom layer. Is TOP SOLDER PASTE file necessary to send to the PCB fabricator,...
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4answers
207 views

Can Altium Designer 17 Generate Missing Paste Mask Layers?

I recently ordered three proto PCBs from a small PCB company. This board house produces Gerber files in-house from their proprietary PCB layout files, and provides this Gerber set to the user on ...
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144 views

Why does my IR receiver PCB only work when I touch the sensor pins?

I have designed a PCB based on a schematic which I am pretty sure that is correct and I have tested the schematic several times on the breadboards and all of them worked properly. But, after I ...
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1answer
112 views

Good PCB Design - Single Power Plane with 2 Power supplies (+ve & -ve)

Recently I've taken over a project which requires low noise but the design given to myself does not meet the requirements. I noticed on the PCB design It has a single Power Plane with 2 separate ...
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2answers
186 views

Too many vias on ground trace

I've got the following layout for 4 layers PCB, I would like to know why there are so many vias on the ground trace.
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114 views

In PCB DFM analysis; manufacturer highlighted TOEPRINT ISSUE. What is component TOEPRINT?

PCB manufacturer have highlighted component TOEPRINT issue. Issue Statement: "Component is too close to another component TOEPRINT." What is mean by TOEPRINT?
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91 views

SMPS and pcb layers

I am trying to design a ultra low noise SMPS with 20 W output (85 V to 220 V) and need to make a choice between 4 layers PCB and 6 layers. On the 4 layers we plan on having components on both sides ...
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63 views

How do eradicate pad to pad clearance with-in the component in Eagle Tool?

I tried clearing the error by defining Rules and net Class, but that does not happen. How to do this?
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2answers
167 views

In 4 Layer PCB - which internal layer has to be consider to calculate Microstrip characteristic Independence for bottom layer

4-layer PCB stack-up as shown in attached figure - In case of bottom layer; which internal layer has to be considered to calculate characteristic impedance for microstrip line on that layer. Is it ...
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313 views

Altium: Via stitching not connecting to plane?

I'm experiencing an issue in altium where my Via stitching vias on the GND net will not connect to my ground plane. Individually placed vias will connect fine through from the top layer polygon GND ...
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1answer
283 views

How to properly connect SMD component to inner layer

I have a four layer board. The stack is divided as follows: Layer 1: Signal Layer 2: GND Layer 3: Power Layer 4: Signal I have SMD components such as an SMD fuse,...
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1answer
111 views

Unable to delete circle in tDocu layer in Eagle

I am making a revision to my PCB board where the initial mounting holes were too large and therefore decreasing their size. The holes are on the Dimension layer (20) and were created using the circle ...
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1answer
233 views

Smd footprint Altium

I'm trying to make the footprint of a smd resistor. But when I place the resistor on pcb layout and flip it, the pads go on bottom layer but the body remains on top layer, viewing from 3D mode. ...
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1answer
218 views

Limited blind via pairs - Use for power or for signal?

I'm working on a PCB with 0.4mm WLCSP's and 0201 discretes. It will have components on both sides. The routing is very tight; I can't use a simple plated through hole ("PTH") design. I'd like to ...