PCB News - PCB layout techniques to reduce signal coupling

PCB layout techniques to reduce signal coupling during RF product design
The new wave of demand for Bluetooth devices, cordless phones and cellular phones is prompting Chinese electronic engineers to pay more and more attention to RF circuit design techniques. The design of the RF circuit board is the most troublesome part for design engineers. If you want to be successful at the first time, careful planning and attention to detail are two key design rules that must be highly valued.

Radio frequency (RF) PCB board design is often described as a kind of "black art" because there are still many theoretical uncertainties, but this view is only partially correct. RF circuit board design also has many guidelines that can be followed and should not be Ignored law. However, in actual design, the really practical skill is how to compromise these guidelines and rules when they cannot be implemented accurately due to various design constraints.

Of course, there are many important RF design topics worth discussing, including impedance and impedance matching, insulating layer materials and laminates, and wavelength and standing waves. However, this article will focus on various issues related to the design of RF circuit boards.

Today's cellular phone design integrates everything together in various ways, which is very detrimental to RF circuit board design. Competition in the industry is fierce now, and everyone is looking for a way to integrate the most functions with the smallest size and the smallest cost. Analog, digital, and RF circuits are tightly packed together, and the space used to separate their problem areas is very small, and considering the cost factor, the number of circuit board layers is often minimized. What is incredible is that multi-purpose chips can integrate multiple functions on a very small die, and the pins that connect to the outside world are arranged very closely, so RF, IF, analog and digital signals are very close, But they are usually electrically irrelevant. Power distribution may be a nightmare for designers. In order to prolong battery life, different parts of the circuit work in time-sharing as needed, and the conversion is controlled by software. This means you may need to provide 5 to 6 working power sources for your cellular phone.

The above is the introduction of PCB wiring techniques to reduce signal coupling during the design of RF products. Ipcb is also provided to PCB manufacturers and PCB manufacturing technology.