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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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Tight Space Pin Remapping for General IC Controller Socket Design (3d Printer Main Board) [on hold]

I'm currently contemplating a 3d printer main board design... I would like to minimize price and maximize reliability and re usability. Existing boards use a somewhat monolithic architecture; Usually ...
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2answers
66 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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34 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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2answers
45 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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39 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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1answer
43 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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1answer
122 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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1answer
35 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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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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1answer
113 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
58 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
113 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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1answer
120 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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2answers
193 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
91 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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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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74 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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67 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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1answer
156 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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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
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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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1answer
70 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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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
474 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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2answers
153 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
154 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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129 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
80 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
150 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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1answer
81 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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1answer
77 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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2answers
40 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
96 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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174 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
149 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
55 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
164 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
174 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 ...
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2answers
787 views

GND plane and vias on a two layer PCB

I'm trying to build my first two-layer PCB layout using this example schema: I'm using SMD elements, which I would place on the top layer. Also I would create a ratsnet area as GND on the top layer. ...
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1answer
50 views

LAN9512 differential wire routing on PCB

Using the Saturn PCB Tool (V7.05 - calculation method IPC-2152 - Etch Factor 1:1), in order to achieve a 90 ohm differential line with a single line impedance equal to 50 ohm for a design based on the ...
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2answers
109 views

Putting GND on POWER layer

I have a four layer PCB, with a traditional: signal layer, power layer, ground layer and final signal layer. Due to the set up with the power rails, there are some large spaces on the power plane ...
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2answers
152 views

Which Layer should be considered for Characteristic impedance for 4 layer PCB?

I am developing 4 layer PCB with following general stack up: Layer 1: Signal Layer (top side) Layer 2: Ground Plane Layer 3: Power Plane Layer 4: Signal Layer (bottom side) For Layer 1 & ...
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0answers
98 views

Has double (green) protoboard benefits when using this way of soldering?

I'm intending to use the same soldering 'technique' as in the picture below (just an example), by using wires and solder connections. I am wondering if it has benefits by using the green double sided ...
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1answer
49 views

Solder Pad and Stencil Mask Data Sheet - Confused

I am using Autodesk Eagle. Need to create a footprint for CREE LED XHBAWT which is in the XLAMP XH-B series. I do not understand the Datasheet drawing of the footprint, attached. Are the lower views ...
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3answers
131 views

Best way to flatten PCB again after cutting with utility knife

I cut my presensitized PCBs down to size with rulers and a utility knife when I need a custom PCB. I noticed every time I cut one, the cut is always clean, but the copper on the board at the same ...
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2answers
410 views

Through hole components on a PCB

When prototyping diy PCBs, we would run a small wire from the underside of the board to the top and solder on both sides, wherever there was connection on both sides of a THT component, so there was ...
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1answer
204 views

Layout on double sided pcb

I have some trouble about the design of my homemade double sided pcb shield. I'm not an electronic engineering, i'm just an hobbyist. In my shield i have a 9V power input and from that, using two ...
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2answers
153 views

Power plane short in PCB

I have a multi layer board and have 2.5V plane as one of the layer. Some how during testing something go shorted on 2.5V. I am using the Toneohm 950 to detect the plane short after removing whatever ...
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113 views

Put the crystal on the bottom with thru-vias, or on the top with a blind via?

I'm using an STM32L155 in a very small (0.4 mm pitch) WLCSP package (6x9 array). At this scale there is no room for traces between the balls, so the design requires HDI and/or blind vias to fanout the ...
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1answer
254 views

How to cover vias with solder mask (solder resist) on Proteus

I am using Proteus 8 and wish to cover all the vias with solder mask (solder resist). Could anyone please tell me how to do this?