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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38 views

Altium, mixed signal board, convey to PCB designer whether net must stay over analog region of return plane or digital region of return plane

Some oversimplification is necessary to explain my question--please let's not debate PCB layout techniques--I just need help with a simple Altium question. Preface: One solution to making a good mixed ...
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69 views

PCB design guidance. Is AC in a power plane a bad idea?

I have a 4 layer PCB board that I am working on a new revision for with the following general layer setup: Top=signal = signal layer middle1 = 5V power plane (with 24VAC subdivisions) middle2 = gnd ...
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Mechanical construction of PCB. What is between the layers?

I came across an answer about the construction of a multilayer board. It included an image showing the mechanical construction of a board (see image 1.) This prompted me to think of the actual ...
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Purpose of multiple layer PCB without possibility of blind/buried vias?

What's the purpose of multiple layer PCBs (i.e. 4 layer,) when many manufactures like JLCPCB can't produce blind/buried vias as they just support through-vias? Let's say I have an SMD component with a ...
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78 views

How to connect membrane tracks on a keyboard? Problem on photo

How to connect membrane tracks on a keyboard?
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40 views

Using ground plane between components on top and bottom layer

I’ve recently been reviewing some PCB designs to learn good practices. One thing I’ve seen is that a ground plane is used on top layer between the components and traces. Is this a good practice and ...
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2answers
103 views

Recreating Arduino UNO - PCB design (How are the components connected?)

I'm trying to recreate the Arduino UNO in order to be good at PCB design via EasyEDA or Altium. I have recreated the Arduino Uno schematic and design but it is hard for me to figure out few things (...
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46 views

Multiple GNSS receivers on a tiny PCB - layout advices

I am designing a board where I want to have 2 receivers using different constellations. Due to space constraints, I have the idea to put the two receivers on the same PCB (one on the top layer and one ...
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1answer
40 views

Can I mass delete REFs from components in Kicad?

I have a PCB, and it can't nearly fit all of the REF markings on F.SilkS and B.SilkS. I want to just make my own for a few components, e.g. I would write "R1-R16", rather than "R1",...
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48 views

How does the number of PCB layers affect the temperature of the board?

I understand that a PCB with the exact same circuit on a 2-layer board will get hotter than a higher number board: 4-,6-,8-layer boards. But, I have not been able to find the reasoning for this ...
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114 views

Is there a preferable way to distribute layers in a 4 layer PCB?

I'm routing a PCB and, due to its small size, I'm thinking to use 4 layers. I'm planning to use top, bottom and two internal layers. Summarizing: TopLayer : GND plane Midlayer1: 5Vcc plane ...
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121 views

Increasing thickness of PCB layers

To what values can I increase the thickness of each layer to be able to reach a total thickness of 1.6mm? Is there a specific standard between relative thicknesses for the dielectric layer, signal ...
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58 views

Manufacturer questions about USB 3.0 differential pair spacing in PCB design

After sending a re-design to MFG I got the following question. can someone please explain the notation 4.7/7.3/4.7 mill and the contradiction that the MFG found? Note: we are talking about USB3 ...
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70 views

What is the best way to layout this 4-layer PCB with multiple voltage rails and a large pulse current?

I'm currently working on my first commercial design and this is the final prototype before I finalise the design, so I want to get it as correct as possible. My PCB has 12V, 5V and 2 x 3.3V(digital) ...
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39 views

4 Layers PCB stackup

I'm working with 4 layers PCB and setting layers stackup. This is what Eagle shows me: Do I need to add also layers for solder mask or anything else required for production ?
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Power and rtn plane

I have a simple board, +28v and +28v rtn, these will be planes, there are no signals. I was thinking simple, top and bottom layers, then I thought do the the planes need a plane to be between the two, ...
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50 views

Power on two, cable connected PCBs

I'm making a device that will require two PCBs. One will be smaller, and pretty much just be the sensor that I'm testing. Almost like an evaluation board. This smaller PCB will be connected or ...
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44 views

What is the difference between Internal layer and Internal plane in altium and how to use them?

I'm designing a PCB using Altium and I have 3 signals that I want use in different layers: 5Vcc 3Vcc GND Initially, using Polygon Pour, I made GND planes at the top and bottom layers. However, as ...
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55 views

Layer thickness design for 4-layer boards

I'm designing a 4-layer PCB, containing a GPS module (u-blox NEO M9N) and a Taoglas antenna. The GPS antenna should be on the top layer, and the GPS receiver should be on the bottom layer. Besides the ...
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63 views

Advice on copper pours

Below are the pictures I have of the PCB design of the sepic converter using LT3958 (datasheet here). I used a polygon to connect the GNDS of the IC and output capacitors. Since I have another ...
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2answers
87 views

4-layer circuit board of GPS module design

I'm designing a 4-layer PCB, containing a GPS module (u-blox NEO M9N) and a Taoglas antenna. The GPS antenna should be on the top layer, and the GPS receiver should be on the bottom layer. Besides the ...
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0answers
29 views

Altium Tracks being overlapped

I'm using Altium designer (20.0.13) to edit my old PCB. In some of my PCBs the tracks are overlapped during routing and pushing. Don't know why this is happening even Rules> Electrical> tracks ...
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1answer
68 views

meaning of this BGA footprint symbol

I'm building a PCB library for a BGA component but can't understand what this size meaning in datasheet. Can someone tell me the meaning of this symbol? Thanks.
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102 views

4 layer PCB stackup for motor control board suggestion

This is my first high power PCB. I have been doing some reading and going through few reference designs. really looking for some guidance from the community. Please do correct me and if possible point ...
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2answers
89 views

PCB Design - Do I need a power plane, if only one component uses the power rail?

I'm designing a 4 layer PCB. The two outer layers are going to be routing layers, the 2nd layer a ground layer, and the 3rd layer a split power plane layer. I have a negative and positive power supply,...
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49 views

Proteus 8.11 - Ground plane disappearing when I try to route or move a component

I have a two-layers thru-hole PCB in Proteus 8.11, and I am trying to put a ground plane on the bottom layer. But, every time I move a component or try to route, the ground plane just disappears. I ...
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41 views

Controlled Impedance Trace-reference plane Placement

I am new to high-speed PCB design. I was studying controlled impedance traces from the internet with the help of various documents. Everywhere it says controlled impedance traces need a reference ...
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60 views

Can you cross Live and Neutral traces on opposite sides of a PCB?

Can 230V live and neutral traces be crossed over if they are on the top and bottom side of a PCB? I know there are requirements for creepage and clearance; if that requirement is less than the ...
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2answers
183 views

Differential Pairs and Power Planes

I'm working on a Raspberry Compute Module 4 Carrier with an USB 3.0 Controller with High Speed signals. As I read here in other thread, I decided change polygons for power planes, but I have 2 doubts ...
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56 views

Differential Pair Routing PCB

First at all, thank you so much for all the answers I have received on all the threads. Well, I'm working on PCB Raspberry Compute Module 4 Carrier including USB 3.0 Controller (TUSB7320) using PCIE ...
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61 views

Use of Split Planes

sorry for multiposting but I have a lot of doubts on PCB Design. On my design, Texas Instruments (the chip manufacturer) tells that: "Never route signals over splits in their perspective ...
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27 views

How Prepreg types and number of plies affect mechanical and thermal properties of the PCB

What are advantages and disadvantages when using a single ply of 7628 type prepreg as compared to say 2 plies of 1080 or a similar prepreg. I'm primarily concerned about any mechanical and/or thermal ...
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71 views

Prepreg thickness: ECAD specs vs. fabrication result

I have a question concerning the thickness of the prepreg layers in a PCB. If I understand correctly, the prepreg layers are used for "gluing" together the core(s) and copper foil layers. ...
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51 views

LED Array Controller Circuit PCB Design Questions and Feedback

Background I'm designing a LED controller based on a Teensy 4.1, some AD9833 Function Generators and some TLC5948 LED Drivers. I'm aiming to make an instrument of sorts, specifically a POV display ...
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2k views

Why has the auto-router put my PCB traces on two different layers?

This is my first PCB design. I want to design the PCB layout of the following switched mode regulator: This is the resulting PCB layout in which I've placed my components and the auto-router function ...
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1answer
52 views

Altium Shortcut to cycle through all PCB layers one by one

I wonder if there is any shortcut in Altium to cycle through all layers of a multilayered PCB one-by-one? That is to say that when the shortcut is first entered 'Single layer mode' is selected and ...
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2answers
122 views

PCB 6-layer stackup problem

I'm currently designing a PCB with double side components and I'm limited to 6 layers max. The project has couple of MCUs at 84 MHz. There are USART, I2C, SPI, some analogue lines and high-power lines ...
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72 views

How to show component value on Altium Silkscreen?

The Silkscreen of my Altium PCB project only shows Reference Designators of components. I want to show component value or part number instead of the reference designator on the silkscreen. Is there a ...
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109 views

PCB Layer Number Standards?

Is there any standard or common numbering system for PCB layer numbers? I'm using Altium. I imported a few different components from a couple of libraries and found that they put things like ...
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1answer
83 views

Choosing the correct Ground or Power net for internal copper planes in a 4-layered design

I am a chemistry student trying to replicate a PCB circuit as part of an extra-curricular challenge. I am in over my head, but I am learning a lot and don't want to give up. I tried to route the ...
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1answer
25 views

surface/external edge coupled microstrip vs (internal) asymmetric edge coupled microstrip

In the process of determining the track width/separation of differential pairs for a board design that needs to route usb2, pcie(90R) , gigabit ethernet(100R), CSI/DSI(100R), HDMI im looking a a four ...
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2answers
103 views

KiCAD: Weird ratsnest

I am in the process of hooking up the ratsnest in pcbNew, in KiCAD. I finished with the process, except the last connection. Here it is: The upper copper layer is set to Vdd. As you can see, the ...
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92 views

4 Layer PCB Local Pours on Signal Layers

I'm in the middle of placing components on my first 4-Layer PCB. Layers are Sig-GND-Vcc-Sig. I2C/SPI/UART, up to 20MHz MCU, nothing exceptionally fancy. I have decided to check with the community ...
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316 views

4 Layer PCB Standard Stackup Grounding

I'm about to start placing components on my very first 4-Layer PCB (wrapping up schematic and MCU software tested on 2-layer pre-prototype, all runs surprisingly ok, but still 2 layer meh). I've ...
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68 views

I mixed VDD and VSS plane in a 4 layer PCB - Does it matter?

I made a 4 layer PCB according to a recommendation from this datasheet https://www.ti.com/lit/ds/symlink/dp83848-ep.pdf?ts=1613467684339 Signal Ground 3.3v Singal But instead, when I notice how the ...
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118 views

4 layer stackup, inner layers GND & PWR

To "somewhat" quote Rick Hartley, "the energy isn't in the traces & planes but in between", I'm now wondering, when I use the following stackup: Sig GND PWR Sig You would ...
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55 views

Routing Differential Lines vs PCB Fabrication Constraints

I'm in front of a big question. I need to route 90 Ohms differential lines for a USB 2.0 Project. I understand how to use tools like Saturn PCB Design to give me the correct spacing and lines width. ...
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29 views

Supplying power to op-amp using Via

In my PCB, I am bringing voltage source through the bottom-layer and connected to the supply pin of op-amp on top-layer using via (Drill diameter - 0.3mm) as shown in the figure below. I have doubt ...
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24 views

Power Plane Design

I have a 1.6mm, FR4 board with 4 layer stackup as Signal/Ground/Power/Ground layers. Currently, there are planes for solar power (3.0v - 6v), 5V regulated, 3.9-4.2V from Battery, 3.0v+, 3.3V ...
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42 views

Connecting PCB power planes and polygons

i am making a 4 layer PCB board and in that the inner two layers are ground planes between top and bottom signal layers. I want to know do i have to connect the top layer(signal layer) with ground ...

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