PCB Tech - What should I pay attention to when putting the RF, IF, and LF circuits on the same PCB board?

What should I pay attention to when putting the RF, IF, and LF circuits on the same PCB board?
Hybrid circuit design is a big problem. It is difficult to have a perfect solution. Generally, the radio frequency circuit is arranged and wired as an independent single board in the system, and there is even a special shielded cavity. Moreover, the radio frequency circuit is generally single-sided or double-sided, and the circuit is relatively simple, all of which are used to reduce the influence on the distribution parameters of the radio frequency circuit and improve the consistency of the radio frequency system. Compared with general FR4 materials, CAM foundry recommends that RF circuit boards tend to use high-Q substrates. This material has a relatively small dielectric constant, small transmission line distributed capacitance, high impedance, and small signal transmission delay. In hybrid circuit design, although the radio frequency and digital circuits are built on the same PCB, they are generally divided into radio frequency circuit areas and digital circuit areas, and they are laid out and routed separately. Use grounding via tape and shielding box to shield between them.

Mentor's board-level system design software has specialized RF design modules in addition to basic circuit design functions. In the RF schematic design module, it provides parameterized device models, and provides a bidirectional interface with EESOFT and other radio frequency circuit analysis simulation tools; in the RFlayout module, it provides a pattern editing function dedicated to the layout and routing of RF circuits, and it also has EESOFT For the bidirectional interface of RF circuit analysis and simulation tools, the results after analysis and simulation can be back-annotated back to the schematic and PCB. At the same time, using the design management function of Mentor software, design reuse, design derivation, and collaborative design can be easily realized. Greatly accelerate the process of hybrid circuit design. Among them, the mobile phone board is a typical hybrid circuit design, and many large mobile phone design manufacturers use Mentor and Angelen's eesoft as the design platform.
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