This is definitely a dumb question (no background in signal processing), but what types of use cases are there for lines > 100MHz? I'm assuming a lot (maybe most?).
They're used whenever you need to move a lot of data real fast. Typical examples might be the bus between RAM and the CPU on a PC motherboard, an HDMI connection to a monitor, or something like an external drive inserted into a USB 3.0 port.
As a general rule, these signals are challenging to deal with even on a PCB, but they're particularly tricky if you need connectors and cables running some distance. This is why high-speed cables tend to be a lot more intricate than we assume - for example, here's HDMI:
This is definitely a dumb question (no background in signal processing), but what types of use cases are there for lines > 100MHz? I'm assuming a lot (maybe most?).
They're used whenever you need to move a lot of data real fast. Typical examples might be the bus between RAM and the CPU on a PC motherboard, an HDMI connection to a monitor, or something like an external drive inserted into a USB 3.0 port.
As a general rule, these signals are challenging to deal with even on a PCB, but they're particularly tricky if you need connectors and cables running some distance. This is why high-speed cables tend to be a lot more intricate than we assume - for example, here's HDMI:
https://i.redd.it/f5ewym0r4oka1.jpg
All this to minimize impedance between differential pairs, reduce cross-talk, and keep EMI in check.
Interfaces / Interconnects like PCIe, High Speed ADCs, reference clocks, etc?