RF_LAYOUTPCB layout techniques to reduce signal coupling during RF product designDesign column, circuit board design, IC designThe new wave of demand for Bluetooth devices, cordless phones and mobile phones is prompting Chinese electronic engineers to pay more and more attention to RF circuit design techniques.RF circuit board design 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.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.RF circuit board design also has many rules to follow and rules that should not be ignored. However, in actual design, the real practical skill is how to compromise these rules and rules 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, dielectric layer materials and laminates, and wavelength and standing waves. However, this article will focus on the various issues related to RF circuit board partition design.Today\'s mobile phone design integrates everything together in various ways, which is not good for RF circuit board design. The competition in the industry is very fierce now. 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. The space used to separate their respective problem areas is very small, and considering the cost factor, the number of circuit board layers is often reduced to a minimum. Incredibly, multi-purpose chips can integrate multiple functions on a very small chip, 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 irrelevant. Power distribution may be a nightmare for designers. In order to extend battery life, different parts of the circuit are time-sharing work according to needs, and the conversion is controlled by software. This means that you may need to provide 5 to 6 working power supplies for your mobile phone. RF layout concept When designing RF layout, there are several general principles that must be met first: 1 1. Isolate the high-power RF amplifier (HPA) and the low-noise amplifier (LNA) as much as possible. Simply put, keep the high-power RF transmission circuit away from the low-noise amplifier (LNA).
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