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.
It depends. If your power supply decoupling is not proper then there will be chances of supply noise and if Grounding is not proper, then ground noise may come into picture.
Ground noise is probably worse, because ground is often a
reference for "single ended" signals that are really processed
differentially, so subject to gain rather than designed
attenuation (as supplies see, PSRR). The problem is worse
when you are not dealing with "a" ground, but a ground
network with various series and shunt elements and noise
injected at different points (i.e. reality).
Differential (explicitly) signals remove much of the ground
sensitivity leaving only CMRR / PSRR attenuated ground
"input".
If you have a circuit in mind you should show us, so we can give detailed help.
Suppress GND noise
* differential wiring, as said before
* R or L in the signal line between noisy and clean GND planes, C to target GND.
* difference amplifiers
* intelligent GND_splits and GND_joints to make all involved GND to a clean GND.
The golden rule is to have a ground system through which no current ever flows.
Then you need a power return system that does carry all the noise current which is kept separate.
The ground system then becomes a zero noise reference with respect to all the analog signals, and because no current flows, there cannot be any relative voltage drops, and no introduced noise.
The reference ground needs to be tied to the power ground, but at one point only. Where best to do that depends on the type of circuit.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
