Buses are primarily used for carrying digital signals due to their resilience against noise and crosstalk, which can corrupt analog signals. Digital signals can be recovered even when noise is present, making them more suitable for bus systems. In contrast, analog signals are more susceptible to degradation from crosstalk, necessitating isolation through coaxial cables or shielding methods. Digital buses typically consist of parallel traces over a ground plane, where proximity between traces increases crosstalk. While measures such as spacing traces, reducing distance to the ground plane, and adding guard traces can mitigate crosstalk, it remains a significant issue for analog signals, reinforcing the preference for digital transmission in bus architectures.
