Contents
Which is ground should I connect my PCB to?
The ground that you’ll want to connect to is the chassis ground. This is a meeting point of all the PCB grounding techniques with connections of enclosures. Chassis ground should be connected at a single point, preferably by a star connection.
Why do I need a hole in my PCB?
As the name implies, PCB mounting holes helps to secure your Printed Board to an enclosure. Besides that, PCB mounting holes can be utilized for Electromagnetic Interference (EMI) reduction or preventing ground loops from the ground plane.
How is the chassis ground connected to the ground?
On your PCB, ensure that analog and digital grounds are connected to a single point. The signal ground should also connect to the chassis ground via a single point. Usually, mounting holes on the PCB are designated as chassis ground and they should be connected as follows:
Do you need a circuit to chassis connection?
In some cases additional circuit to chassis connections may have to be made, but these are in addition to the one in the I/O area, not in place of it. The best way to understand this is to consider the circuit ground as a noise voltage generator (as a result of the finite ground impedance and the logic currents flowing through the ground).
When do you connect ground to an enclosure?
Connect your circuit ground to the enclosure. This alone will shield your circuit. Ground loop happens when you have two earth points with different potentials. If you connect everything to the same enclosure, with a thick enough cable, you wouldn’t experience any ground loop.
When to place ground vias in PCB stackup?
Placing grounded stitching vias at appropriate distances can help eliminate these oscillations as they provide a capacitive path back to ground. As a rule of thumb, these ground vias must be placed at 1/8th of a wavelength or less from the relevant conductor. Ground Planes in Your Stackup
Why do you need grounding on a chassis?
Chassis grounding is an important part of the ground separation strategy to reduce ground noise. It provides a dedicated return path for the ground current to earth ground. Chassis grounding not only helps in protecting the PCB from surges and ground noise, but it may also act as a shield against EMI.
Why do you need a PCB mounting hole?
As the name implies, PCB mounting holes helps to secure your Printed Board to an enclosure. Besides that, PCB mounting holes can be utilized for Electromagnetic Interference (EMI) reduction or preventing ground loops from the ground plane. Printed Boards that are sensitive to EMI are usually placed in a metal enclosure.