Patent ID: 7277320
Filing Date: 2007-10-02
Classification: B82Y,G11C,H01L

Abstract:
1. A magnetic memory device, including a plurality of magnetoresistive devices each including a magnetic sensitive layer of which the magnetization direction changes by an external magnetic field, wherein one storage cell includes a pair of the magnetoresistive devices, the magnetic memory device comprising: a read line pair supplying a read current to the pair of magnetoresistive devices; and a sense amplifier circuit reading information from the storage cell on the basis of a difference between a pair of read currents flowing through the read line pair, wherein the sense amplifier circuit includes: a differential switch pair being disposed for each read line pair; a bias resistor pair being disposed between each differential switch pair and a power source; and a constant current circuit being shared among a plurality of the differential switch pairs, and making the sum of a pair of read currents flowing through each differential switch pair constant.