Using optical isolation devices or the signal across the transformer can also be split to achieve clearance. For the former, the gap is split across the optical signal; in the case of using the transformer, the magnetic field across the partition gap. PCB assembly Another possible solution is to use differential signaling :signal from a line into a signal from another line to return, in which case, do not need to as a return path.
To further explore the simulated signal digital signal interference must first understand the high-frequency current. Always choose the minimum PCBA manufacturer impedance of high frequency current (lowest inductance), located directly below the signal path, so the return current will flow through the adjacent circuit layer, regardless of the adjacent layer is the power or ground plane layer.
In practice, generally tend to use uniform, and some of the PCB assembly Division for simulation and digital parts. Simulation of signal in all layers of the simulation circuit board wiring area, and digital signal wiring in the digital circuit area. In this case, the digital signal back to the simulated signal current will not flow into the ground.
Only the digital signal routing in the circuit board or to the simulation part of the simulated signal wiring on the circuit board on top of the digital part, pcba manufacturer the digital signal will appear on the simulation of signal interference. This problem occurs not because there is no split, the real reason is that digital signal routing inappropriate.