Hi, everyone . I asked a lot in this forum and you guys helped me. I want to say thank you. I got work my project on breadboard and then, I designed a PCB with pin headers. I want to make one more step and I want to make PCB with ICs and SMDs. I already did, I did my schematic and connection side. I left only ground connections.
First, I want to ask you. My system is working with PCB which is pin headers. I made this PCB. It is 2 layer board and I used 2 ground plane. Now I am afraid for these ground things. This system is working with ground polygon and it is working. If I use ground for every component again, will it work ? I know it is important for emi/emc . I looked google a bit.
I am working with DC voltage. I am using 1 switching regulator and 1 LDO. (I read switching regulator have some problems with ground plane). My system using stepper motor driver (3 signal pin), one load sensor (it has own analog supply) , 1 ethernet module ( I used ferrite beat for clean analog supply and I separate RJ-45's ground with 1nF/2kV cap) and 1 relay module.
I looked my microcontrollers design (Adafruit, Sparkfun) and all of them used ground plane top and bottom.
What should I do ? Should I use 2 polygon top and bottom and use GND via around PCB?
I am really confused about GND. Should I form my ground myself with wire and by one by (8 mil for signal and for powers bigger.)?
Sorry I mean , I used 2 polygon for my first PCB. System is working with 2 polygon GND. I didn't connect GND's and I didn't use polygon for my IC design. U1 has GND. U1 has central GND pad. Here is photo:
Hi,
Have you measured with a DMM if they are already connected via a component lead?
You didn't use polygon but it is working with polygon.
I can't see your polygons.
Can you post an image of top layer with silk screen and a separate bottom layer image.
No , I couldn't explain myself I guess. This one has no polygon. This is new. I did PCB with pin headers (for example I used directly Arduino nano , W850io et). I am using this pin header PCB sicne 4 months. I posted new one , I am trying to make this with ICs and SMDs. Old one (Pin header PCB) was working when it has 2 polygon.
If you have SMT fast logic chips use a groundplane on the bottom side always. The signals on the topside need a ground return path close by and the ground plane provides this. If you circuitry is slow (like audio amplifier), a groundplane is not required (but you probably need star-grounding in that particular situation).
Power traces should be wider to reduce stray inductance, and ensure every supply pin to every IC has proper decoupling close to the IC.
