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How to prevent radio frequency, intermediate frequency and even low frequency circuits from interfering with each other?
2021-09-29
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Author:Kavie

How to prevent radio frequency, intermediate frequency and even low frequency circuits from interfering with each other?

PCB

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, RF circuit boards tend to use high-Q substrates. This material has a relatively small dielectric constant, a 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.


57. For the radio frequency part, the intermediate frequency part and the low frequency circuit part are deployed on the same PCB board, what solution does mentor have?

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, provide parameterized device models, and provide bidirectional interfaces with radio frequency circuit analysis simulation tools such as EESOFT; in the RF LAYOUT module, provide pattern editing functions dedicated to the layout of radio frequency circuits, and The bidirectional interface of EESOFT and other radio frequency circuit analysis simulation tools can back-annotate the schematic diagram and PCB for the analysis and simulation results. 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.
The mobile phone board is a typical hybrid circuit design, and many large mobile phone PCB design manufacturers use Mentor and Angelen's eesoft as the design platform.