Logic Ground Isolation requirements
Logic Ground Isolation requirements
(OP)
I am wondering if their might be a better way to write the following requirements:
1) Digital (Logic) grounds shall be isolated from each other and from analog ground.
2) Analog grounds shall be isolated from each other and from digital ground.
I am not a EE, and am trying to develop testable requirements for grounding. These seem a bit ambiguous, but I might be over analyzing.
Thanks - JE
1) Digital (Logic) grounds shall be isolated from each other and from analog ground.
2) Analog grounds shall be isolated from each other and from digital ground.
I am not a EE, and am trying to develop testable requirements for grounding. These seem a bit ambiguous, but I might be over analyzing.
Thanks - JE
RE: Logic Ground Isolation requirements
edit:
Here's a good overview: Analog.com.
RE: Logic Ground Isolation requirements
Note that I didn't use 'shall'. It sounds like you don't really have a performance specification driving this, at least not by the details provided so far. There's no point in putting a value on the isolation unless it is driven by a requirement.
Z
RE: Logic Ground Isolation requirements
Appreciate your response.
RE: Logic Ground Isolation requirements
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Logic Ground Isolation requirements
Unless the requirements writer is participating in the system design, then usually it would be up to the system or circuit designer to design such details.
For aerospace applications, perhaps one could look up the applicable design standard and just reference that.
Also worth noting that 'testable' is only one of four methods of providing proof of compliance. The traditional list is: Inspection, Demonstration, Test, and Analysis. A good overview here.
As others have reminded us, some circuits will require isolation. They'll often be associated with signals being input via transformers or optocouplers.
Aircraft wiring typically has explicit signal returns, explicit power returns, shielding and safety grounds. Aircraft are also a good example when dealing with people confused by the "necessity" for grounding to Earth (the Earth being tens of thousands of feet below).
RE: Logic Ground Isolation requirements
Z
RE: Logic Ground Isolation requirements
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers