METHOD AND DEVICE FOR ERASING RECORDED INFORMATION (VARIANTS) Russian patent published in 2008 - IPC G11C16/06 

FIELD: electronics.

SUBSTANCE: method for erasing information recorded on a microchip with heterogeneous semiconductor carrier with power-independent memory includes injecting short-term nominal power voltages onto the microchip and the controlling gate. During that time in the conductors of the microchip, positioned on its substrate, Foucault currents are excited with intensity of at least 60 mA with by irradiating the conductors of the microchip with two orthogonal alternating sinusoidal magnetic fields. Irradiation is conducted using three kicking coils by magnetic fields at sharp angles on two sides of the perpendicular to the substrate. In the plane, which lies perpendicularly to the direction of magnetic field expansion, the direction of its vector is changed between 90° and 270° with the frequency of the first magnetic field ω, with value not less than 6,28 rad·kHz and intensity, sufficient for excitation of Foucault currents in the conductors of the microchip with value of not less than 20 mA. In the plane, which lies perpendicularly to the direction of expansion of second magnetic field, the direction of its vector is changed between 180° and 360° with frequency of second magnetic field valued between 2ω and 4ω. The value of amplitude of second magnetic field more than twice exceeds the value of amplitude of first magnetic field. Irradiation using the second magnetic field is started after one quarter of frequency period after beginning irradiation using the first magnetic field. The duration of irradiation should not be less than duration for which nominal microchip power voltage is enabled. A carrier is positioned in the fourth cylinder kicking coil. Transverse dimensions of kicking coil hollow exceed transverse dimensions of the substrate with recorded information. The throttle is positioned inside the third cylinder throttle coaxially. The first and second circular kicking coils are positioned coaxially on the opposite sides of the third kicking coil in such a way, that the longitudinal axis of first and second kicking coils is orthogonal to the longitudinal axis of third and fourth kicking coils, and these axes intersect in the middle of the third kicking coil.

EFFECT: increased reliability of information deletion without possible restoration, reduced time of erasure, reduced power consumption.

3 cl, 9 dwg