Guard Pattern in PCB Board Design There are important caveats to be noted with implementing a true high quality Guard Pattern in PCB Board Design. For traditional through hole PCB connections, the guard pattern should appear on both sides of the circuit board, to be most effective. And, it should also be connected along its…
Static PCB Board Effect in PCB Manufacturing If a circuit displays sensitivity to Electrical Leakage in PCB Manufacturing, even the most rigorous cleaning can offer only a temporary solution. Problems soon return upon handling, or exposure to foul atmospheres, and high humidity. Some additional means must be sought to stabilize circuit behavior, such as conformal…
Static Circuit Board Effect Leakage resistance is the dominant static circuit board effect. Contamination of the PCB surface by flux residues, deposited salts, and other debris can create leakage paths between circuit nodes. Even on well-cleaned boards, it is not unusual to find 10 nA or more of leakage to nearby nodes from 15-volt supply…