eli5: How are resistors, capacitors and coils placed on integrated circuits?

Question

eli5: How are resistors, capacitors and coils placed on integrated circuits?

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Answer 1

When packing an integrated circuit it is common to solder the die to a thin PCB that you cover in epoxy. This thin PCB can also contain other circuit components. This is common for bypass capacitors, filter coils and other larger components. But it is also possible to create these components directly on the die in the Back End Of Line section, a thicker layer of copper and dielectric used to connect the semiconductors together. But the semiconducting layer often make a great resistor on its own where needed. However there are transistor circuits which can simulate resistors, capacitors and coils which tends to be cheaper to make in an IC.