Hi,

I am designing a 4 layer pcb board. For the GND layer I have given seperate GND ground for high current path(from transistors) which is connected to normal GND at a point.

I have given the seperate analog ground(AGND).

My professor commented like this:

If you only have analog parts over the analog GND then it is good that you are using a separate analog gnd but I am surprised that the analog part is so spread. A problem might be that your analog GND is connected at the end of the digital GND and digital noise will be added to your analog gnd. A start connection to the common GND separation might improve.


what does this mean?????

How can I add start connection???

I am adding image with this message

Regards
Vivek Alaparthi

 

I believe your Professor means "Star Connection" - Google this.

 

Hi,


I need to use star point grounding connection for AGND and GND in PADS software??


I have seperate copper areas for GND and AGND in my 4 layer pcb design.


How can I implement star point grounding connection for AGND and GND???


I am attaching the image for AGND and GND of my design???



Regards
Vivek