Questions tagged [ground-plane]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
29
votes
5answers
8k views

Should I really divide the ground plane into analog and digital parts?

I am about to design my first PCB as part of my graduation project. Of course, as the first step, I try to learn as much as possible. A part of the research I found this 3 part article, that suggests ...
7
votes
4answers
6k views

Should there really be 1 MΩ resistance between an anti-static wrist strap and a pc?

My previous question: what exactly is grounded through motherboard standoffs? The answers suggest that a PC case is grounded in 2 ways: To the ground plane of the motherboard, through the brass ...
2
votes
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 ...
3
votes
1answer
1k views

How do I design correctly ground plane separation for Texas Instruments TPS63060 IC?

I'm concluding my two-layer PCB design and my last obstacle is ground planes. Specifically, the problem is the TPS63060 IC that requires Power Ground separation from Control Ground (pin 7). That is a ...
6
votes
1answer
835 views

Additional signal plane vs lots of vias

I have a circuit that I am currently designing using a 4 layer PCB (signal, ground, power, signal). The PCB has rather a lot of vias to route the signals around the board (there are size constraints, ...
6
votes
3answers
4k views

For a 4 layers PCB (with ground plane), covering with ground polygon on Layer 1&4 necessary?

For a single or double layered PCB board, usually I will cover all the empty spaces in the layout with Ground. This is the 1st time I am designing a 4 layer PCB layout. Layer 1: top signal (high ...
3
votes
3answers
5k views

How does Stitching capacitor provide shortest return current path between plane splits, as we know that it blocks DC current?

I heard that Stitching capacitors are used to provide shortest return path whenever a signal is routed along the 2 power plane splits. As we know the return current path will be right under the trace. ...
3
votes
1answer
3k views

Question about analog and digital ground planes

I am using a microcontroller with an integrated DAC. On my 4 layer PCB, I have connected the digital and the analog ground planes below the microcontroller. The microcontroller and the DAC are ...
6
votes
1answer
3k views

What's the purpose of the ground plane?

What's the purpose of the ground plane? I guess it's a pretty basic question and I tried to understand it by reading http://en.wikipedia.org/wiki/Ground_plane#Printed_circuit_boards but I still don't ...
3
votes
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 ...
3
votes
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 ...
3
votes
2answers
385 views

Extent of ground plane beneath filtered DC converter?

I'm laying out the PCB for a small and simple power supply to feed some audio amplifiers. It will feature a DC -DC converter module and I'd like to filter the output for 1) extra smoothness 2) learn ...
3
votes
1answer
2k views

Is it OK to place ground plane under transformer?

I have a large transformer (50kHz, ferrite E-core) on the PCB. I want to pass power rails under it on the bottom layer. Should I place a large ground plane on the top layer to shield these power rails ...
2
votes
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 ...
2
votes
3answers
626 views

Connect signal ground to safety ground?

We are designing a product which has to meet EMC directives. It consists of metal backplate folded into a chasis (the front is open). on the backcover there is a SMPS mounted. and on top of this we ...
1
vote
2answers
2k views

Is the bracket of a graphics card grounded?

I would guess so, but i want to make sure. Is the bracket of a graphics card grounded to the ground-plane of that card? The metal bracket is the thing with the DVI, HDMI, DisplayPort etc. ...
1
vote
1answer
3k views

Altium split power plane

The layer stack manager has created a power plane for me on which there is a default polygon pour that is the board size : For some reason I can't do a polygon pour on that layer... I would like to ...
0
votes
2answers
1k views

Why are laptops grounded to earth via 1E6 ohm resistance and desktops not?

I measured a few laptop AC-to-DC adapters. 1E6 ohm between GND pin (goes into the laptop) and earth prong (into the wall). Desktops are grounded directly to earth: 0 ohm. Why this difference?
0
votes
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 ...
0
votes
1answer
85 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 ...
0
votes
1answer
142 views

Ground type for DC regulator

When considering a simple DC regulator such as a Texas' LM22677 on a PCB, should it use the digital or analog portion of the ground plane? EDIT: Contextualizing, I have a 12V input feeding two ...