Guard-ring circuit is designed aroung high sensitive (low current high impedance inputs). What is the technical impact if a guard-ring circutry is fully masked versus unmask ?
Electronic – Soldermask impact to guard-ring circuit
solder-mask
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Best Answer
A guard ring is normally used to stop leakage currents that flow through surface contamination of the PCB, by shunting them to a low-impedance node. If the ring is isolated from the contamination by soldermask, it can't do its job.