How do chip design engineers make sure that there is no interference between different circuit modules due to electromagnetic fields, given that every circuit component is very close to each other?
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Computer modeling. Chip designers use specialized software that can model electromagnetic field strength and interaction. Today, pretty much all complex products are designed on a computer before they go into production. In addition to the general design software, specialized software exists for a wide variety of simulation and modeling scenarios.
For example, have a look at the [electronics related product listing from Ansys](https://www.ansys.com/products#t=ProductsTab&sort=relevancy&layout=card&f:@productcollections=[Electronics]). You’ll see software for everything from electric motor design (which relies entirely on EM field modeling) to high-frequency signaling simulation. Ansys even makes a [specific piece of software for designing PCB (circuit boards) and chip packages (when you put multiple chips on a single die)](https://www.ansys.com/products/electronics/ansys-siwave). Ansys isn’t the only vendor for this type of software, of course.
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