Issue link: https://resources.pcb.cadence.com/i/1541046
32. Using Guard Traces and Shielding for Ultra-Sensitive or High-Speed Nets In some designs, even careful spacing and domain separation aren't enough: ultra- sensitive analog traces (such as low-level sensor or amplifier inputs), high-impedance nodes, or very high-speed single-ended lines (such as GHz clocks, RF, or certain test points) can still pick up crosstalk or radiate. Guard traces (grounded copper traces routed parallel to the signal) act as an "electrostatic fence," capturing coupled fields and providing an immediate low-impedance path for noise to return to ground. Shielding with copper pours or metal cans provides another layer of protection against EMI and improves signal fidelity. When And Where To Apply Use Guard Traces And/Or Shielding For: f Very high-impedance or low-level analog lines (sensor, preamp, ADC input) f High-speed clocks (GHz range), RF signal paths, or very long digital traces f Analog/digital domain crossings or signals routed through noisy areas f Any net failing crosstalk, EMI, or measurement noise requirements during validation Example of guard trace for sensitive signals