摘要:
In the ultrasonic-inspection method proposed, a high-frequency test probe with a transducer diameter equal to the nominal diameter of the spot weld to be inspected is coupled, through an input path, with the plates in the vicinity of the spot weld and, using the pulse/echo method, the plates are irradiated with ultrasonic waves and the echo pulse trains received are evaluated. In each case, the spectral line corresponding to the overall-thickness propagation time is examined for sufficient minimum amplitude (energy density) and for sufficient minimum width (damping).
摘要:
A calibrated magnetic random access memory (MRAM) current sense amplifier includes a first plurality of trim transistors selectively configured in parallel with a first load device, the first load device associated with a data side of the sense amplifier. A second plurality of trim transistors is selectively configured in parallel with a second load device, the second load device associated with a reference side of the sense amplifier. The first and said second plurality of trim transistors are individually activated so as to compensate for device mismatch with respect to the data and reference sides of the sense amplifier.
摘要:
A calibrated magnetic random access memory (MRAM) current sense amplifier includes a first plurality of trim transistors selectively configured in parallel with a first load device, the first load device associated with a data side of the sense amplifier. A second plurality of trim transistors is selectively configured in parallel with a second load device, the second load device associated with a reference side of the sense amplifier. The first and said second plurality of trim transistors are individually activated so as to compensate for device mismatch with respect to the data and reference sides of the sense amplifier.
摘要:
A circuit configuration for a current switch of a bit line or a word line of a magnetoresistive random access memory (MRAM) device, comprising a directional switch and a voltage driver that, in operation, reduces the ON resistance of the directional switch. In one embodiment, each terminal of the line is provided with such a switch.
摘要:
It is difficult to fabricate a semiconductor memory device without any faulty memory storage cells. One solution is to produce more storage cells than needed on a device and faulty storage cells are replaced by the redundant storage cells. This solution requires that the addresses of the faulty storage cells, along with the replacement storage cells, be saved in a memory. The present invention teaches the use of non-volatile memory cells, particularly magnetoresistive random access memory (MRAM) cells, to store the addresses. Non-volatile memory cells can effectively replace the laser fuses currently used and also provides an advantage in the elimination of the laser fuse-burning step during the fabrication of the device.
摘要:
An architecture for a magnetoresistive random access memory (MRAM) storage cell 300 with reduced parasitic effects is presented. An additional runs of metal laid in parallel to both the wordline 310 and the bitlines 320 of the MRAM device provide a write wordline 345 and a write bitline 355 are separated from the wordline and the bitline by a dielectric layer 340 and 350 provides electrical isolation of the write currents from the magnetic stacks. The electrical isolation of the write wordline 345 and bitlines 355 reduces the parasitic capacitance, inductance, and resistance seen by the wordline and bitlines during the write operation. The wordline 310 and bitlines 320 remain as in a standard MRAM cross-point array architecture and is dedicated for reading the contents of the MRAM storage cell.