Abstract: A method for shielding an inductive sensor includes arranging an annular shielding coil outside an annular detection coil, the shielding coil surrounds the detection coil, and the radial thickness of the shielding coil is smaller than that of the detection coil. An inductive sensor adopting the above method for shielding the inductive sensor, in which the shielding coil is arranged outside the detection coil of the inductive sensor, magnetic fields generated by the two coils are opposite in direction and partially cancel out each other. When interference exists, the magnetic fields generated by the two coils are influenced at the same time and are attenuated or increased by identical strength. Therefore, the summed magnetic field strength can be kept constant, resonance voltages cannot be attenuated, the interference rejection of the inductive sensor is improved, and the sensitivity of the inductive sensor is not influenced.

Abstract: A voltage controlled current source circuit is utilized to clamp the internal compensation node of a low dropout (LDO) regulator with an NMOS output during load transients. The circuit senses a voltage drop of the internal node and mirrors its current to the internal node to hold the internal node voltage when the voltage starts to drop low enough to turn off the output transistor.