Issue link: https://resources.pcb.cadence.com/i/1541046
III. POWER, GROUNDING, AND THERMAL A common ground plane is a PCB layout approach where all components share a single, continuous ground layer. This plane serves as the main return path for current and is connected directly to the power source ground. 17. Using a Continuous Ground Plane A solid, continuous ground plane under signal and power traces is the single most important factor for good signal integrity, power integrity, low EMI, and predictable system performance. The ground plane provides a low-impedance return path for all signals, reduces voltage noise, contains electromagnetic fields, prevents ground loops, and enables effective decoupling. Any splits, slots, or gaps force return currents to detour, raising impedance, increasing crosstalk, and making the board vulnerable to EMI and timing errors. Even experienced designers sometimes fragment planes unintentionally, especially when working with multi-voltage or mixed-signal systems. When And Where To Apply Apply this rule at the earliest stackup planning stage (see Tip 2), and every time you route signals or pour copper. It is absolutely essential for all high-speed, RF, mixed-signal, and low-noise analog designs. Every layer stack and routing decision should be checked for ground plane continuity.