Questions tagged [ground-plane]

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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 ...
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0answers
41 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 ...
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0answers
22 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 ...
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3answers
92 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 ...
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1answer
52 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 ...
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1answer
55 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 ...
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0answers
30 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
22 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. ...
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0answers
20 views

USB 3.0 board return current path on reference plane

I'm designing my first USB 3.0 pcb. I am curious what path the return currents (if any) will take on the reference plane. The board will be an adapter that will be soldered to the end of a USB cable (...
0
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1answer
33 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 ...
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1answer
61 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
184 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 ...
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1answer
69 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 (...
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1answer
34 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 ...
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1answer
39 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 ...
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1answer
39 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
210 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. ...
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0answers
33 views

eagleCAD 9.5.2 - free version - how to ratsnest properly using polygon tool to define ground plane in PCB

I'm having some trouble getting the thermal spokes to show up on a via pad I have placed on my PCB after running ratsnest over a defined polygon. I have even tried making the copper dimensions in the ...
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1answer
65 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
476 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
5k 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 ...
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2answers
159 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 ...
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1answer
45 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
111 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 ...
2
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2answers
348 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 ...
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1answer
168 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
155 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
368 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
64 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
72 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
359 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
248 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
88 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 ...
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1answer
85 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
72 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
241 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
136 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
94 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 ...
0
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1answer
37 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
204 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
250 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 ...
2
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1answer
75 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 ...
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2answers
114 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
101 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
130 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
43 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
131 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
136 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
57 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
160 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 ...