Questions tagged [ground-plane]

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2answers
72 views

Questions about RF ground plane and low frequency reflections

Why do RF signals on a microstrip/stripline require a ground plane to propagate within a circuit? When studying DC and low frequency AC circuits in school, it appears that ground is a particular point ...
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0answers
43 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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1answer
57 views

Designing a DC stage for a mixed signal board

I am working on a board that contains a DC stage, an SBC module, mechanical relays (smd) and communication modules. The power supply is a cheap 24v AC-DC converter. It is a COTS product. The DC stage ...
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1answer
74 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
80 views

Analog and digital ground plan with isolated DC-DC converter

I use two isolated DC-DC converter in parallel from 24V One TDN 3-2411WISM (single output) to create 5V for the "digital world" followed by LDO to create 3V3 and GND for the VDD (+Vout) and ...
0
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1answer
86 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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3answers
170 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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2answers
73 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 ...
2
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1answer
53 views

Differential ADC reference plane - ground or midpoint?

The Microchip (ex-Atmel) ATSAMD10 has a 12-bit SAR ADC with the option to use differential input. I'm generating a virtual ground (\$V_\mathrm{mid}\$) at the midpoint (512 mV) of the reference voltage ...
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0answers
12 views

Eagle ground plane showing as all black in Gerbv's Export (as PDF) but not its display

When I include a ground plane in a copper layer and then run Cam Processor in Eagle, the gerbers look fine in Gerbv's display. But when Gerbv Exports the visible layers as PDF, the ground plane area ...
0
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1answer
67 views

PCB antenna track and SMA connector controlled impedance

I designed a pcb for GSM module, using all the specifications given by the manufacturer, to have a controlled impedance. But there is a small detail that escapes me and that is not documented. When ...
0
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1answer
79 views

EMI shielding ground and isolated DC/DC

Given an isolated DC/DC converter, such as Traco TMR4. The GND fill, and internal GND layer(s) would be referenced to the -Vout pin. The TMR4 has an application note showing a fairly typical EMI ...
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1answer
47 views

Regarding PCB IFA microstrip antenna mirror image on ground plane hole areas

This is regarding the adjacent mirror image formed over the ground plane by a PCB antenna during operation. Take the first image of the IFA with the ground plane highlighted in yellow on layer 2, the ...
3
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1answer
57 views

Removing high impedance ground pours parallel to signal traces in Altium

whenever I route parallel traces on Altium, I get those narrow ground pours between my signal traces when I fill my ground planes. A collegue told me: since these pours are narrow and thus high ...
2
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1answer
78 views

GNSS module direct grounding to ESP32 increase sensitivity

I have a simple cirquit that composes of the following : ESP32-DevKit-LiPo (ESP32-WROOM) GNSS Module Beitian BN-357P with ufl connector for external antenna GNSS Active Patch Antenna My simple is ...
0
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2answers
78 views

Polygon not pouring over net tie pads in Altium

I am working with net ties in altium to link different ground signals. My net ties seem to work, no drc error, and I can link traces between them and objects of the same net. If I try to pour a ...
1
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1answer
74 views

Avoiding ground noise in analog circuit pcb design

Below single layer PCB is a constant current sink circuit (electronic load), it's pure analog supplied with ±12 V and consumes very low current (~50 mA) except the transistor control part (which ...
4
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3answers
169 views

Does putting solder mask over a ground plane influences its heat exchange with the air?

If you want the best thermal exchange with the air, is it preferable to leave a thermal/ground plane raw or to cover it with solder mask? And how important is the difference? (Dave from EEVblog is ...
2
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0answers
58 views

Need feedback for a PCB design (digital/analog synth)

Ok so I'm designing a synth using the NES sound chip (AY-3-8910). After poorly designing a PCB for it and testing it, I realized there is noise from the MIDI input bleeding to the audio output. I read ...
2
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0answers
48 views

How to calculate temperature rise of PCB polygon?

I'm designing a PCB where I have a polygon that carries current from one terminal to two pads, each pad should pull 33 Amperes, so a total of 66 Amperes running through that polygon. How can I ...
0
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0answers
64 views

Proper grounding in a battery powered AGV

I have a few general-grounding-technique questions for an AGV IO & control PCB. Some context: The power input pins VIn+ and VIn0 of the board will be connected to the 48V battery terminals. The ...
1
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3answers
108 views

Why does attaching the case to the PCB ground plane cause the audio to cut out on my cassette player?

I bought a NIB (new in box) cassette recorder on eBay recently but have had problems with the audio from the start. The issue was that touching the dials could cause the audio to crackle, go quiet, or ...
0
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1answer
332 views

BLE beacon 2.4GHz PCB antenna layout for SoC Nordic nRF52832

Schematic, suggested by the datasheet: PCB is round with 33mm, FR4 1.6mm Bottom side Top side Bottom+top 3d view The antenna drawings is based on AN043 of Texas, HERE. How about the question on ...
0
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1answer
81 views

Antenna conterpoise or ground plane. Confused about length requirements

I have an appliation where i need to mount a multiband (VHF/UHF/700/800/900 MHZ) mobile antenna (picture 2) on a tower. The spec sheet for the antenna says it used a 4 foot diameter ground plane for ...
0
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0answers
32 views

Is it necessary to remove ground on all layers when using isolated DIO

So, I am using uptocouplers and digital isolators for a project connected to a microcontroller GPIO. I removed the ground (ground plane cutouts) under the load side of the components, is it necessary ...
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0answers
33 views

Protecting External Connector Ground Pin from ESD

I have some TRS (stereo phone) connectors on my protable USB device (no earth ground), and I'm wondering what to do about ESD events that enter the device via the sleeve (ground) of the connector. ...
0
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1answer
35 views

How to make sure you have “adequate” ground in a self-enclosed portable circuit?

How to make sure you have "adequate" ground in a self-enclosed portable circuit? I read that a good ground ensures steady signals. But, if you run a circuit from a battery it is not connected to ...
1
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1answer
63 views

Plane Chassis Grounding

I'm having a hard time understanding Chassis Grounding. From my understanding, the frame of a plane is used for that and all of it can return to the batterie. Given my understanding, it remains a ...
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2answers
404 views

RF 50 ohm dummy load PCB design

I am a rookie on both RF and PCB design and I am currently trying to do a 50 ohm 11 watt dummy load project for 100MHz-1GHz. My calculations are done for the load but I have some questions about ...
0
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1answer
193 views

Stripline (with target impedance) between ground and power planes?

The common idea for a stripline is that the trace is sandwiched between two ground planes. My question: is it the same, for the purpose of characteristic impedance, to have a ground plane or a power (...
0
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1answer
43 views

Should I cut away the ground pour above a diffpair on the first inner layer, which are Z-matched to the ground layer (L2)?

I'm routing diffpairs on the 1st inner layer of a 4-layer pcb which are Z-matched to the 2nd inner layer which is entirely a ground pour. The top layer has traces and routing AND also a ground pour ...
0
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1answer
44 views

Clarification of solid ground plane (antennas)

I'd like some clarification on identifying if a ground plane is solid or not. Is the definition for a solid ground plane simply a ground plane with no gaps? For example, would the antenna below be ...
0
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1answer
72 views

PCBA Plane Connect Relief dimensions

When connecting a thru hole, via or otherwise, to an internal GND or PWR plane, the default Altium configuration uses a thermal relief connection. Although I've seen a number of posts saying to ...
7
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2answers
319 views

What's the best ground topology for this mixed signal board?

I'm designing a 4 layer mixed signal PCB with sensitive analog circuits and RF-digital circuits. The board have many mechanical constraints so the places of the analog and digital circuits are fixed. ...
3
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1answer
75 views

Split digital ground planes

I am designing a PCB for an image sensor. The manufacturer provided a design guide in which they recommend using multiple split ground planes. One ground plane is for the analog supplies, but there ...
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3answers
918 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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4answers
6k views

Why does 1/4 wavelength have a ground plane and 1/2 wavelength needs none?

Why does 1/4 wavelength have to have a ground plane and 1/2 doesn't? I know that an antenna that has half a wavelength does not need the ground plane (example a dipole antenna) and when using a ...
2
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2answers
298 views

Extending an RF ground plane outside a small PCB

I am making an RF PCB with a surface-mount antenna on it. It is a quarter-wave antenna, so the ground plane should also be as long as a quarter wavelength for good RF performance. For example, a ...
0
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1answer
47 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 ...
2
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2answers
119 views

Why won't zones flood into vias or other plated through holes that are part of a footprint in Ki-CAD

I am using KI-CAD. Visible in the picture is a GND_USB plane (yellow) on layer 2, and also the top layer (red). I have a QFN package with an exposed pad in the center. For some reason the ground ...
3
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2answers
591 views

KiCad net tie on inner layer

I'm making a 4 layer board, with ground on one of the inner layers, as usual. I would like to keep the digital and analog grounds logically separate, although they of course connect on the PCB, and ...
1
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1answer
638 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
203 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 ...
12
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3answers
437 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
70 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 ...
0
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2answers
84 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
636 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
406 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
123 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
107 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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