Questions tagged [ground-plane]

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52 views

AGND and GND - Grounding in Schematics

I have seen a few electrical schematics where there are separate symbols for grounds. "Agnd" and "Gnd" Can someone help me understand what are the differences between those two and where to use "Agnd"...
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5answers
133 views

How to desolder an element from a PCB?

I want to desolder an element from a PCB, I can see all the solder joints that are holding it on to the board and I can reach all of them easily. I am not very experienced in working with a soldering ...
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3answers
300 views

How to minimize impedance from capacitor to Gnd and Power planes

I'm trying to minimize the impedance from my capacitors to the Gnd and Power planes. 1. Via positioning I've learned from several sources that the best via positioning is close to each other. This ...
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0answers
60 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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2answers
62 views

Connecting GND planes on PCB

In my PCB, there are two GND polygons (1 & 2) which are connected to the same GND plane. The only way I was able to connect them was through vias as shown below: I realized that two current paths ...
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1answer
60 views

Altium Polygon Pour Direct Connect

I'm designing a 4 layers PCB in Altium Designer 19.1. My PCB have a ground plane on layer 2 and a small copper pour area on layer 1. The copper pour area on layer 1 is connected to the ground plane ...
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2answers
65 views

PCB: ground plane thermals (in Eagle)

In a previous iteration of a PCB layout, I added a ground plane fill as recommended by many tutorials online (eg Sparkfun). By default Eagle creates thermals to ease soldering to the ground plane, but ...
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2answers
46 views

How to connect multiple ground pins in a FFC connector

So I have a bunch of these FFC connectors shown here, and a lot of the middle pins are actually ground pins (highlighted in green). I have a multi-layer board, so I want to route all these grounds to ...
1
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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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0answers
63 views

Connected ground planes from different power sources not working

I made a simple uC (8266) based schematic that controls some peripherals. It is powered via 12v ac-dc power supply connected to the lm2596: PCB1: The uC has uart connector like that: PCB1: This is ...
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1answer
68 views

Ground plane under power inductor in DC to DC converters

Is it a good idea to put ground plane (fill the area with copper) under the power inductor in DC to DC converters? I was looking for answers about step down regulators but I would like to know about ...
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3answers
81 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
79 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
35 views

Ground separation between ADC and high current capacitor discharge circuit

I recently designed a capacitor discharge welder for my welding applications, and I come through a problem about separating grounds between AGND of the controller and (-) terminal of the big 1.3 ...
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0answers
115 views

PCB Layout - Ground Plane Clearance Around and Under Ceramic Resonator

We are using Murata's 4MHz Ceramic Resonator (CSTCR4M00G53-R0) in one of our designs and request help in PCB layout design around Ceramic Resonator. The below Murata's FAQs page suggests not to place ...
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1answer
96 views

Traces over ground plane [duplicate]

Sometimes it cannot be avoided to run traces over a ground plane (bottom layer) in a two layer PCB. I have two questions regarding this: In the (simplified) example below, what is preferred? To use ...
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0answers
58 views

PCB Ground Plane on Two Layer High Signal Density Board

To give an overview of the design. I am creating a PCB with a header connection for raspberry pi that will use RPI I2C capabilities and GPIO to control board mounted integrated circuits whose outputs ...
2
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1answer
56 views

Bypass capacitor in combination with ground plane

I read it is advisable that every IC has a bypass capacitor, as close as possible to VCC, going to GND. However, I'm wondering, as I want to create a PCB with a GND layer as second layer, can I place ...
2
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2answers
71 views

4 layer board back bypass capacitor power plane connection guideline reason

I'm reading Power Bus Decoupling Guidelines for Printed Circuit Boards with Widely Spaced Power Distribution Planes. And they have these recommended connection configurations for bypass capacitors ...
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2answers
78 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
78 views

Does a lithium battery make a good ground plane?

A patch antenna I'm using calls for a 50mm x 50mm ground plane under it, mostly to cut multipath reflections in the bottom lobe. Naturally, the closer to the antenna and the more conductive the ground ...
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0answers
29 views

Connecting Ground Paths

I am using a stm32f407vgtx to control full bridge drivers which drive a H bridge of 4 N-channel Mosfet. I don't have any idea about grounding. I am thinking of using two separate ground AGND (ground ...
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1answer
77 views

Multiple ground planes, single point ground, and a level shifter

I'm using a level shifter to go from 3.3V to 5V (digital/analog). According to the datasheet, if I put 1 ground on the left side of the IC and the other on the right, it would tie the grounds together ...
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1answer
133 views

Does this criss-crossed GND plane look like it will function properly?

I'll be using it at 12 MHz and... not the best parts placement resulted in this board layout. So I am asking more experienced people if it will definitely not work or maybe it will. Thanks! edit I ...
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0answers
43 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
144 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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3answers
394 views

Ground Plane Tips for Beginners

I have made a few PCB's over the past few months as I have started to learn about design. All of the circuit boards have been Arduino based, so nothing to powerful. I design them up in Eagle and I ...
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4answers
199 views

Routing VCC with jumpers?

I'm trying to route a new VHF RF receiver (LO is 151MHz, RF is 162MHz). There's a pair of LC filters on this board, as well as a Si5351 oscillator and a crystal. From what I've read, an uninterrupted ...
3
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1answer
265 views

Shield in Inner Copper Layer

I have been designing second version of 4 Layer PCB. The PCB has connectors all over the PCB. In the first version, I had Copper Pour (I call it ...
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0answers
79 views

my i2s audio signal is not working. i expect this has something to do with ground and resistors, but i need some help with the details

I am more familiar with software, but I have a project going on that has a tiny amount of hardware involved. I would really appreciate some help with this part. I have existing hardware that has a ...
2
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1answer
97 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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3answers
94 views

Sensor damage, ground loop or something else?

We are testing an capacitive fuel level sensor in field. Its mounted on top of a heavy construction vehicle (colmar) with a 24v battery system. Our sensor runs for few weeks and damages. Every time a ...
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1answer
87 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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3answers
1k 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
189 views

does adding Vias through the antenna feed line change impedance?

I have a GPS through-hole patch antenna, the through hole need to be connected to the bottom layer and then from there the feed-line flows to the GPS receiver. But I want the GPS receiver to be on top ...
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2answers
73 views

How exactly a ground plane helps inproving antenna gain? What is the logic behind it?

How exactly a ground plane helps inproving antenna gain? What is the logic behind it? As per my general understanding, ground plane in reference to any perticular signal trace on PCB helps to absorb ...
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0answers
89 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
121 views

What is the purpose of this grid on the ground plane near a wifi antenna?

The PCB for this Steam Link has a grid of squares near the antenna. It also has pads for what I guess is either testing or adding 0ohm resisters. What is the purpose of this feature, and why are ...
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1answer
264 views

Can the USB port's metal enclosure be grounded?

As shown in the image below, the USB port's metal enclosure is touching the copper clad of the PCB (which is a ground plane). Can Bad Things Happen™ if the port's enclosure is grounded? I beep-...
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1answer
67 views

Split Ground plane with motor drivers

This is a PCB with few stepper drivers. I have a question about the ground plane. I have this idea to split the ground plane for each driver, so, I force the return path to pass through the capacitor....
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1answer
296 views

Manufacturers' recommendations for ground plane for GPS patch antennas

I see requirements for specific ground plane sizes in many GPS antenna datasheets, but I also see many devices that ship with significantly smaller ground planes. Do these integrators know something ...
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1answer
58 views

Issues with designing ground plane for switching relays in high noise environment

I am designing a PC Controlled 8 channel Relay using AVR microcontroller. Here, the relays are on the right side of the board and are controlled by the AVR micro on the left side. The eight TTL ...
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1answer
137 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
312 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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0answers
366 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
531 views

PCB multiple ground planes

I am designing a two layer PCB. Two part schematic is shown in attached figures. In the circuit, I am getting four gate signals from FPGA of 3.3V and and error signal, also of 3.3V as inputs and I ...
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1answer
82 views

Suggestions on soldering through hole large planes

I am small scale manufacturing PCB's I designed for high power actuator and LED control. It is 6"x8", 2 ounce copper and large power and ground planes, with no thermal reliefs. It has a section at one ...
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1answer
337 views

Ground and earth layers on PCB

I am designing a digital board with USB input and output. Shield of USB is connected to a chassis ground as per USB specs and connected to GND through a R and C in parallel USB power has a common ...
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2answers
120 views

analog ground and digital ground question

I'm designing a CCD control circuit and have some questions. 1.Should the ground in the 1st and 2nd position in the oval be analog ground or digital ground? 2.If they should be the DGND, whether ...
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2answers
363 views

Via stitching removes solid ground plane

I read in some places that having a solid ground plane is needed . Does not via stithing causing the solid ground plane to become broken? Is this okay? Also when everyone talks about return current, ...