Active shielding device and method of active shielding

An active shielding device, the active shield device comprising:

• first, second, third, and fourth sets of current sources, wherein each of the first, second, third, and fourth sets of current sources is configured to generate a plurality of currents;
• an analog wire shield unit connected to the second and fourth sets of current sources;
• first, second, third, and fourth sets of switches that are connected to the first, second, third, and fourth sets of current sources, respectively, and are controlled by a digital control sequence;
• a first current to voltage converter connected to the first set of current sources and to the fourth set of current sources through the analog wire shield unit, wherein the first current to voltage converter is configured to generate a first voltage in response to the currents that are generated by the first and fourth sets of current sources;
• a first voltage comparator connected to the first current to voltage converter and configured to compare the first voltage with a first reference voltage;
• a second current to voltage converter connected to the second set of current sources and to the third set of current sources through the analog wire shield unit, wherein the second current to voltage converter is configured to generate a second voltage in response to the currents that are generated by the second and third sets of current sources;
• a second voltage comparator connected to the second current to voltage converter and configured to compare the second voltage with a second reference voltage;
• a third voltage comparator configured to compare results from the first voltage comparator and from the second voltage comparator;
• a digital active shielding unit connected to the second and third sets of current sources;
• a plurality of digital logics configured to process the digital control sequence before conducting the digital control sequence through the digital active shielding unit and after conducting the digital control sequence through the digital active shielding unit to generate a first processing result signal and a second result signal;
• and
• a digital comparator configured to compare the first processing result signal with the second result signal.

A method for active shielding, the method comprising:

• generating a plurality of currents using an active shielding device;
• conducting the currents through a plurality of analog wire windings of an active shielding unit of the active shielding device in response to a digital control sequence;
• generating a voltage in response to the currents using a current to voltage converter of the active shielding device;
• comparing the voltage with a reference voltage using a voltage comparator of the active shielding device;
• processing the digital control sequence before conducting the digital control sequence through a plurality of inverters of an active shielding unit of the active shielding device and after conducting the digital control sequence through the inverters using a plurality of digital logics of the active shielding device to generate a first processing result signal and a second result signal, respectively;
• and
• comparing the first processing result signal with the second result signal.