Im trying to make an amplifier with 4 layer PCB. Many reasons is that one Compliancy, second reduce noise and shorter trace lengths and shorter loops and loop area. Now I have a question is that how to have the ground plane.
Option one: I read it somewhere that to use complete ground place both signal and power ground as one plane.
Option two: Use star ground in one plane for signal and use another star in another plane as power ground and then join them using a 10ohm resistor in the coaxial of both. Stack as Power GND, signal, signal GND, signal.
use ground pour in the left over places of signal plane and then short it to signal ground in both the signal planes.
If anyone has got CE approval with low noise performance with 4 layer PCB please guide me on this aspect.
Option one: I read it somewhere that to use complete ground place both signal and power ground as one plane.
Option two: Use star ground in one plane for signal and use another star in another plane as power ground and then join them using a 10ohm resistor in the coaxial of both. Stack as Power GND, signal, signal GND, signal.
use ground pour in the left over places of signal plane and then short it to signal ground in both the signal planes.
If anyone has got CE approval with low noise performance with 4 layer PCB please guide me on this aspect.
Technical Articles/Talks
Also
"Grounds for grounding"
Elya Joffe
The main problem for ground bouncing is a dumping of load current in the ground.
So the best cure is not to dumping load current in the ground and you just need to design *balanced* amplifier with bridged OPS.