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Questions tagged [copper-pour]

The term "copper pour" refers to an area on a printed circuit board filled with copper

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54 views

VCC on surface or inner layer on 4-layer board?

If I can get away with, I will use 6-layer design where I get two dedicated GND planes, L2 and L5, which creates strong reference plane for traces on L1, L3 and L6. When you're working with 4 layers,...
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81 views

What is the proper placement of VCC and GND copper pours in 4-layer PCB?

This is my first PCB design and I'm struggling with proper copper pour usage. I would like to copper pour VCC and GND. From what I understand, a copper pour will net multilayer plated through holes ...
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1answer
98 views

Problem Placing Polygon Pour on Board Altium 17.1

I'm laying out a two-layer PCB. I've routed all the signals, including power and ground. I like to add a ground plane on both layers by placing polygon pours. I'm having trouble getting Altium to ...
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1answer
143 views

What are these gaps in PCB polygon pours near vias of the same net?

When adding polygon pours to a power layer on my PCB in Altium Designer (v17), I'm getting weird clearance gaps near vias. The poly and vias are connected to the same net. I'm new to Altium, so I'm ...
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3answers
956 views

How do I know where to put stitching vias?

I'm working on a PCB that allows me to attach a TSSOP IO expander to a breadboard more easily for experimenting. I asked a question regarding the configuration of decoupling capacitors for an IC with ...
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3answers
2k views

Why are ground pours isolated from each other on the top layer?

I am reading the application note from TI about the LM3409 evaluation board. In the board layout (Figure 3) the bottom layer is a single GND pour. But top layer has also some copper pours which end ...
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2answers
189 views

Are multiple groundplanes a good idea on a 4-layer pcb?

I'm working on a design of a 4-layer PCB. The stackup is like this: Top: signal Inner 1: power distribution traces and copper fill (VCC) in some areas Inner 2: signal Bottom: ground plane There ...
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2answers
192 views

reason to have entire Cu layer as GND connected through via (KiCad)

This is the first time I am designing a PCB and I was looking at example PCBs drawn in KiCad (the image below is my first PCB, to remove any sources of confusion). I noticed that oftentimes, when ...
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215 views

Altium through-hole type, “slot” vs “rectangle”, effect on copper pour

I am drawing a board which will fit in an enclosure with batteries. The battery terminal tabs should come up through slots in the PCB, and solder to a pad around the slot perimeter. I created a new ...
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1answer
133 views

PCB layer stack up practices [duplicate]

Sorry in advance for the newbie question, but I can't seem to find a good answer. Recently, I've gotten into printed circuit boards and it is all still fairly new. I'm working towards creating a 4 ...
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1answer
130 views

2 Layer PCB Copper Pour on the bottom layer

I am an amateur PCB designer. Trying to design my first PCB. It's a two layer board with ESP8266 module. I have read lot about ground plane and copper pour at the bottom layer. I have tried to use all ...
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4answers
605 views

Is a copper pour redundant on the top layer of a multilayer (>= 4) board with a ground plane?

In a multilayer board with a GND plane directly under the top layer, does adding a copper pour to the top layer give extra value in terms of reducing crosstalk and EMI? If all signal traces already ...
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1answer
240 views

Altium Polygon Pour Order Issues

I am using Altium Designer 14.1 and I do not know if it is an issue with this version or something else. The problem I am having is I have a solid copper pour covering the whole board. I want to put ...
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0answers
206 views

Flex circuit solid or hatch copper pour

I have a flex circuit board with 5 LEDs mounted on it. I have large copper areas attached to the LEDs for improved heat dissipation. I read here that "With a hatched plane, the moisture can exit the ...
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3answers
462 views

Cannot change to front copper layer in KiCAD

I am learning to design PCB using KiCAD. I followed a tutorial on youtube. I got stuck at changing the layer of the PCB. From the video, the layers can be interchange by pressing page up (front ...
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2answers
404 views

Alitum: polygon pour with a fully included round hole

I need to draw a round hole on a polygon pour. I've followed this documentation (see video in "Subtracting Selected Polygon Pours" paragraph). It explains that you must first selected the reference ...
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127 views

Altium: Remove Small Sliver Openings in Hatched Pour

One of Altium's polygon pour modes is a hatched version, which allows the user to specify an individual track width and a grid size and it automatically generates a pour in a cross-hatch pattern. It ...
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1answer
352 views

EAGLE restrict area isolation [duplicate]

Hi, in my circuit I made ground plane and inside of it I need clear area without copper for anthena. So I have created polygon in tRestrict layer and used Ratsnest for reconection. It worked, but not ...
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1answer
315 views

How to separate ground pour from ground traces in Eagle?

I'm designing a board where I have ground pour at the component side. I'm using plenty of decoupling capacitors. The problem is that the ground pour "consumes" the ground traces like this: Is it Ok ...
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1answer
270 views

Are copper pours hidden by default in EAGLE?

I'm looking at the EAGLE board file from the Arduino wiki page, and I feel like I must be missing something - none of the ground pins of U1 appear to be connected to anything: As you can see, the GND ...
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1answer
764 views

Altium Designer PCB project Ground fill polygon cant connect to one of same net component pad

I'm finishing one of my pcb layout, in this case is a multilayer one. the trouble is that design rule checker find me 5 unconnected GND pads but the trouble is that this pads are close to a copper ...
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3answers
509 views

Can this copper pour be an EMI problem?

I am looking at the following PCB (single layer). The checked red/blue is GND. Can this polygon give EMI problems in the sense that it acts as an antenna because it does not form a closed loop ? ...
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1answer
155 views

Microcontroller and decoupling capacitors on the VDD layer

I have a microcontroller design that is implemented using a two layer PCB. All the components need to be placed on the bottom layer due to the fact that there is a display in the top layer. In short, ...
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4answers
3k views

Altium Designer, using signal layers as power planes

In cases when a 4-layer board is space limited, and there's a lot signal traces in the whole board, "power plane layers" is not very usefull to distribute power rails. Because it is used only to draw ...
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0answers
1k views

Coppers Pours for 4-Layer RF (433MHz) Board?

I've got a 4-layer prototype transmitter board built that is using a low-speed MCU (2 MHz). The critical RF sections are 50 ohm impedance matched to the board's characteristics. I eliminated the GND ...
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2answers
233 views

Why does copper pour cause impedance discontinuities?

Inspired by this question's accepted answer, I've been studying how PCB trace impedance can be affected by the trace's surroundings. However, something in the accepted answer is confusing me: ...
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1answer
553 views

Ground pour under ESP8266 12-E

I want to pour ground under a ESP8266 12-E just for thermal reasons but I don't know if this can affect it somehow or if it's safe to do. The PCB is all under 5V, it's only 2 layers and it would have ...
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2answers
554 views

Thickness of thermal relief on copper pour

I am working on designing a pcb that will have a copper pour. I have selected to use thermal reliefs to connect the pour to pads, but I am a little confused on the thickness. Should each spoke of the ...
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1answer
68 views

Will my square pad short if the pour isolation is too small?

How do I get the pour to isolate the pad and not the drill here? I'm assuming the square pad goes all the way through and will short my second layer (in teal). Am I correct? update: Confirmed! I put ...
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1answer
591 views

Adding multiple thermal relief spokes to a large pad in Mentor-PADS

Regarding Mentor PADS Layout software (v9.5)... I have a large rectangular pad (the tab on a power FET) which is surrounded by a large copper pour (for current and thermal capacity). When I pour the ...
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4answers
2k views

Why were hatched polygons pours used instead of solid pours in the past?

While reading [David L. Jones]'s PCB Design Tutorial, he mentions that hatched polygon pours are a thing of the past. Solid fills are preferred, hatched fills are basically a thing of the past. (...
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1answer
205 views

Does a Guard Ring around a PLL loop filter make sense?

Should I guard a PLL loop filter against current leakage with a pour? If so, where can I connect the guard plane? As an illustration: I use an IC in need of an external PLL-loop-filter connected to ...
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3answers
1k views

Merge polygon pours in Altium Designer

I need to know if there is a way to merge two or more polygon pours of the same type, in order to have only one. So two objects that become one. Is this possible? Because anytime I need to redefine a ...
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1answer
2k views

Need help in Altium polygon copper pour selects and deselects using arcs, angles, full circles

This is a follow up question of my previous question. I've done this board using AutoCAD and exported to DXF. After that I used Altium designer to import the DXF file in which the outline turned out ...
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2answers
640 views

In KiCAD - is it possible to have two nested rings of copper fill?

I'm using KiCAD to create a nested series of PCB rings - each two layer with copper fill on the front and back. The problem is when I add edge cuts defining the inner and outer edges of the outer ...
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1answer
1k views

Altium : How to connect pads of an F antenna

I'm designing a reverse F antenna. It is connected to ground and the antenna line. It is built of several place fill with small overlaps. To do this, I declared the component as a net tie. The ...
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2answers
2k views

PCB Heater design issues

I'm using copper tracks laid out on an FR4 board as a heater device. It's a serpentine design with the copper 0.3mm wide and 0.2mm spacing. I have three sets of tracks which I intend to heat up at ...
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2answers
6k views

When to use thermal relief and when not to

I'm working on a charger circuit which basically works as a buck-converter. I'm pouring my components with copper planes. However as some of the components are connect to a large ground plane on ...
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1answer
789 views

PCB copper thickness heatsinking

Does increasing PCB copper thickness have any benefit for improving its heatsinking ability? I am looking at mounting some SMD Op Amps (OPA552) which will need to dissipate up to 2W each. I will ...
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2answers
217 views

Which traces should I fill / pour?

What are the general rules of filling / pouring traces? What traces should I pour? I assume ground is poured most often. Should I pour other traces? Supply/Signal or something else perhaps? What are ...
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2answers
185 views

Eagle PCB design issue

I have finished the schematic layout for my design which contains transformer. I also found the optimized design 100%, but the transformer background should be black while I'm having only portion of ...
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1answer
2k views

Add exposed copper to eagle board?

I am new to using eagle. I want to put some exposed copper pads that I can solder to on my board. The catch is that they cannot have through holes. I tried just making polygons in the top layer, but I ...
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1answer
428 views

Should I using ground pours to surround high speed lines?

Previously I've been using ground plane pours in Eagle to connect ground points and also to surround lines that I feel need protecting from surrounding noise. This is on two layer boards. By drawing a ...
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1answer
1k views

Clearance between copper pour and board outline (in OrCAD 10.5)

I’m laying out a PCB with an intricate outline. First, I drew the outline (yellow in the picture below). Then I’ve added a copper pour at the top layer (blue in the picture below), but a clearance ...
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2answers
4k views

Unconnected Copper Pour or Not?

I'm finishing a small PCB that has too many traces in order to realize a good ground plane. The circuit doesn't need particular layout precautions, so this is not a problem. Since the ground plane ...
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1answer
1k views

Benefits of top and bottom ground pour in multilayer boards with proper ground plane layers and stackup

I'm trying to get some analytical feeling for the use of ground pours on bottom and top layer in multilayer boards with proper stackups such as (for example). Top Gnd Sig1 Power Power Sig2 Gnd ...
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2answers
619 views

Do I copper - pour on mains voltage PCB?

I don't have much experience with designing boards for mains voltage. I've designed a circuit and I have lots of unused space on the board. Do I fill it with copper or leave it blank? I guess the PCB ...
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3answers
9k views

Eagle: Removing unwanted bits of copper pour

I have lazily made a copper pour in Eagle by highlighting a rectangle around my irregular shaped board. How do I then selectively remove the copper pour from outside the board boundary and the little ...
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3answers
2k views

What happens to copper pours that are 'too narrow'?

What happens to copper pours that are narrower than PCB manufacturer spec? Let's say spec is 10/10 mils (trace/space) and the copper pour in between soic-08 is only 5mils because it can't be wider (...
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1answer
3k views

PCB Design - Polygon pour remove islands or not?

Sometimes a polygon pour (I use Altium, so I am using it's naming reference, for other packages it can be power plane and etc.) makes a dead copper area, and the software gives you the option to ...