Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

How a Ground Plane Reduces PCB Noise

Status
Not open for further replies.

hioyo

Advanced Member level 4
Joined
Aug 18, 2021
Messages
113
Helped
0
Reputation
0
Reaction score
1
Trophy points
18
Activity points
869
Dear Team,

Can you please tell me how ground plane works.I know it provides a leat impedance path for return currents.
But How a Ground Plane Reduces PCB Noise.

regards
Haio
 

Solution
Hi,

* as a plane it shields electric fields.
So that the noise of a trace can not go "through" the plane to the opposite side.

* magnetic field / impedance
It´s not the retunr path alone, it´s the combination with the signal path.
A signal in a trace causes a current and thus a magnetic field. Causing an inductance.
With a GND plane, the "return" current flows in the GND plane in very close proximity to the signal.
The current direction in the GND plane is opposite to the signal current. And so are the magnetic fields, thus thy cancel out each other. No magnetic field, no inductance, no transmitting antenna for EMI

Klaus

added:
This is an often discussed topic, thus there are many hits on an internet search. Besides a lot of...

KlausST

Super Moderator
Staff member
Joined
Apr 17, 2014
Messages
23,016
Helped
4,715
Reputation
9,446
Reaction score
5,087
Trophy points
1,393
Activity points
152,497
Hi,

* as a plane it shields electric fields.
So that the noise of a trace can not go "through" the plane to the opposite side.

* magnetic field / impedance
It´s not the retunr path alone, it´s the combination with the signal path.
A signal in a trace causes a current and thus a magnetic field. Causing an inductance.
With a GND plane, the "return" current flows in the GND plane in very close proximity to the signal.
The current direction in the GND plane is opposite to the signal current. And so are the magnetic fields, thus thy cancel out each other. No magnetic field, no inductance, no transmitting antenna for EMI

Klaus

added:
This is an often discussed topic, thus there are many hits on an internet search. Besides a lot of good documentation you will also find videos with explanation and according simulations.
 
  • Like
Reactions: hioyo

    hioyo

    Points: 2
    Helpful Answer Positive Rating

hioyo

Advanced Member level 4
Joined
Aug 18, 2021
Messages
113
Helped
0
Reputation
0
Reaction score
1
Trophy points
18
Activity points
869
Hi,

* as a plane it shields electric fields.
So that the noise of a trace can not go "through" the plane to the opposite side.

* magnetic field / impedance
It´s not the retunr path alone, it´s the combination with the signal path.
A signal in a trace causes a current and thus a magnetic field. Causing an inductance.
With a GND plane, the "return" current flows in the GND plane in very close proximity to the signal.
The current direction in the GND plane is opposite to the signal current. And so are the magnetic fields, thus thy cancel out each other. No magnetic field, no inductance, no transmitting antenna for EMI

Klaus

added:
This is an often discussed topic, thus there are many hits on an internet search. Besides a lot of good documentation you will also find videos with explanation and according simulations.

This is a very good explanation.Before posting I did a google search.I did not see any beautiful explanation like this.
 

Solution
Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top