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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3answers
114 views

Should internal signal layers of a PCB have a ground pour?

I see a lot of discussion about using copper pours on the outer layers of a multi-layer PCB, as well as a single continuous ground plane on a multi-layer board, but there isn't a lot of information ...
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18 views

how to import mentor pcb file into Altium Designer

I have one PCB file downloaded from the Internet. I want to use the PCB file on Altium. As the Schematic file is DSN, I think this PCB is a Mentor PCB file. File Extension is *.pcb. I tried to import ...
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1answer
35 views

Are PCB spreading inductance and loop inductance the same thing?

Hi there, there is a mention of power/ground net spreading inductance in the Figure 1. I'm assuming this is the same as PCB spreading inductance. If so, is loop inductance the same thing here? Or ...
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41 views

60079-11 / 7 PCB layout design rules

Is there a PCB guideline paper or book that discusses how to design PCB layout and components that meet IEC60079 (-0, -11, -7) and how to limits the use of encapsulation or conformal coating. In my ...
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2answers
52 views

Top VS bottom layer conventions

Are there any conventions regarding which side of board should be top and which should be bottom? The only convention I can think of is placing the user-facing side on top if the bare board is going ...
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1answer
57 views

Identify whether PCB 1/4" audio jacks are balanced or unbalanced

I have a Fostex 2016 line mixer and was trying to see in the manual (https://www.fostexinternational.com/docs/tech_support/manuals.shtml) whether the 1/4" inputs and outputs are balanced (TRS) or ...
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38 views

Analog and Digital GND on top of each other

I am designing 4-layer mixed signal PCB and it is totally crowded (with components). I know how analog and digital grounds should be separated below components. But I do not have enough room in some ...
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2answers
126 views

What is the actual purpose of having a copper foil layer in PCB?

Out of several layers that make up a PCB, one of them is a layer of copper foil (see image below), What purpose does this layer serve to the PCB? Also, some PCBs have just one copper foil layer ...
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84 views

Microcontroller and Inductor part placement on PCB

I am laying out a very tight design (space wise) on a PCB. Due to space restrictions, I was forced to placed a microchip microcontroller on the bottom side of a PCB with an inductor on the top side (...
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41 views

Oscilloscopes and Packed Two-Layer PCB boards? (“Operating Table” PCBs)

I have recently completed a very complicated 2-layer circuit board. Every square mm has a component in it, two of the sides undergo edge plating, and one is riddled with right-angled connectors. I ...
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1answer
145 views

Ground planes in Eagle PCB

I have designed a PCB in Eagle. I have doubt regarding creating the ground planes. I have created a ground plane on the top layer only But I even have connections in the bottom layer too which are ...
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1answer
63 views

Does layer order matter on multi layer PCB?

I have a 4 layer PCB with the following planes... Connector (Top): Holds all traces going from connectors to components. Signal Ground: Coper filled completely. Power (Bottom): Coper filled for +15V ...
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57 views

PCB routing - Which of these would be a better design?

Case 1: The route seems to be long! Case 2: Two branches emerging out of a single via?
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25 views

How to change the highlight color in Eagle when using the show command?

I want to use "show GND" and have everything highlighted show up purple. How do I achieve this?
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1answer
52 views

PCB Layer Stack Dielectric Constant Math

I have a question reference PCB layer stack and the adding multiple dielectric constants together. The image and description below should help clarify the question: The differential pair will be ...
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1answer
44 views

DC-DC PCB power plane on inner layer

I am currently designing a 6 layer board that has a couple of DC-DC converters on it. The largest one is a buck that transforms 12V to 5V with an ouput current of max 7A. Layer 2 would be GND, layer ...
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67 views

How to determine vias and through holes from 4-layer Gerber files

I'm trying to understand the difference between the vias and plated through-holes in these reference Gerber files. On layer 3, I don't understand why there are so many holes (vias)?. Why are some ...
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3answers
610 views

How to calculate the size of ground plane we need to use in a PCB (printed circuit board) design [closed]

I searched about the ground plane and found out the ground plane is a good solution to reduce noise and get a seamless ground. How do I calculate the size of the ground plane for a PCB? When and ...
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1answer
59 views

4 layer stackup Eagle

Can someone explain to me how I can change the layout order of my 4 layer board in eagle. I'm sure this is really a silly question, I'm coming from Kicad so I'm a bit green here. It's not obvious ...
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62 views

Ground Planes, 0v or GND?

I have a board that has a dual voltage isolated DC-DC converter on it. The converter takes 0 an 5v in and gives -5,0,5 v out. The 0v of the input is actual ground. Most of the PCB uses the isolated ...
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77 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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125 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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2answers
86 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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50 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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1answer
74 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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1answer
51 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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184 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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1answer
52 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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3answers
85 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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2answers
85 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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1answer
469 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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2answers
48 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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2answers
166 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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2answers
83 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
47 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
158 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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91 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
96 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
140 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
175 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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46 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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1answer
382 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
122 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
127 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
153 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
252 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
362 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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0answers
59 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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131 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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121 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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