Before revision: A driven shield is a method of electrical shielding used to protect low-current circuits against leakage current, a driven shield is often referred to as a guard, especially when applied to PCB traces.
After revision: Driven guard with a voltage bufferA driven shield is a method of electrical shielding used to protect low-current circuits against leakage current, a driven shield is often referred to as a guard, especially when applied to PCB traces.