PCB layout skills to reduce signal coupling during RF product design PCB layout skills 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 skills. The design of RF circuit boards is the most troublesome part for design engineers. If you want to succeed at the first time, careful planning and attention to details are two key design rules that must be highly valued. Radio frequency (RF) circuit board design is often described as a \"black art\" because there are still many uncertainties in theory, but this view is only partially correct. There are also many rules that can be followed and laws that should not be ignored in RF circuit board design. However, in actual design, the real practical skills are how to compromise these rules and laws when they cannot be accurately implemented due to various design constraints. Of course, there are many important RF design topics worth discussing, including impedance and impedance matching, insulation layer materials and laminates, and wavelength and standing waves. However, this article will focus on various issues related to RF circuit board partition design. Today\'s cellular phone designs integrate everything together in various ways, which is not good for RF circuit board design. The industry is very competitive now, and everyone is looking for ways to integrate the most functions with the smallest size and the lowest cost. Analog, digital and RF circuits are all tightly packed together, with very little space to separate their respective problem areas, and considering cost factors, the number of circuit board layers is often minimized. Incredibly, multi-purpose chips can integrate multiple functions on a very small die, and the pins connected to the outside world are arranged very closely, so RF, IF, analog and digital signals are very close, but they are usually electrically unrelated. Power distribution can be a nightmare for designers. In order to extend battery life, different parts of the circuit are time-sharing work according to need, and the switching is controlled by software. This means that you may need to provide 5 to 6 working power supplies for your cell phone. RF layout concept When designing RF layout, there are several general principles that must be met first: Put the high power RF amplifier (HPA) as much as possible...
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