what's the purpose of 0 ohm resistors on seperating two GND?

[Lannie]

Hi all.I just know that 0 ohm resistor can serve as an isolation for high frequency noise,but anything else?
Actually that's the homework and my teacher says there are three...

 

[IanP]

https://www.edaboard.com/threads/50547/

https://www.edaboard.com/threads/70750/

:grin:

 

[dr pepper]

The only time I have used them is for links, as at the time my component machine would not bend plain wire, only bodied resistors.
So thats 2 uses, dunno the other one.

 

[cyberrat]

A link.
A link.
A link

There, thats 3 uses for a zero ohm resistor.

They were created to fit normal resistor holes and handle just like resistors instead of having to cut wire links etc.
Now SMT ones are available just the same, doing the same process of linking.
Either linking tracks or linking groundplanes etc. I.E. link Agnd & Dgnd together at one point.

Still just a link.

 

[sjeniak]

Usually if a circuit have sevelar GNDs on board , they all connects to a single point on a circuit. The problem with it, is that it not always clear if this will help to denoise the circuit. This why usually designers instead of shorting grounds with a PCB track, leave user some fexibility to check if the circuit will operate better, with seperated grounds.