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Read circuit for magnetic tunnel junction (MTJ) memory

專利號
US10867652B2
公開日期
2020-12-15
申請人
Taiwan Semiconductor Manufacturing Co., Ltd.(TW Hsinchu)
發(fā)明人
Gaurav Gupta; Zhiqiang Wu
IPC分類
G11C11/00; G11C11/16; H01L27/22; H01L43/02; H01L43/10
技術領域
mtj,nlr,rnlr,memory,read,layer,imtj,current,cell,tmr
地域: Hsin-Chu

摘要

In some embodiments, the present application provides a memory device. The memory device includes a first current mirror transistor, a first pull-up read-enable transistor, an MTJ memory cell, a first pull-down read-enable transistor, and a first non-linear resistance device. The MTJ memory cell includes an MTJ memory element and a first access transistor. The first non-linear resistance device is coupled in series and between the first pull-up read-enable transistor and the first current mirror transistor. The first non-linear resistance device is configured to provide a first resistance when conducting a first current and a second resistance greater than the first resistance when conducting a second current smaller than the first current.

說明書

FIG. 1 illustrates some embodiments of a magnetic tunnel junction (MTJ) memory cell 100 that can be used with various read techniques as provided herein. The MTJ memory cell 100 includes a magnetic tunnel junction (MTJ) memory element 102 and an access transistor 104. A bit-line (BL) is coupled to one end of the MTJ memory element 102, and a source-line (SL) is coupled to an opposite end of the MTJ memory element through the access transistor 104. Thus, application of a suitable word-line (WL) voltage to a gate electrode of the access transistor 104 couples the MTJ memory element 102 between the BL and the SL, and allows a bias to be applied over the MTJ memory element 102 through the BL and the SL. Consequently, by providing suitable bias conditions, the MTJ memory element 102 can be switched between two states of electrical resistance, a first state with a low resistance (the P-state, magnetization directions of the reference layer and the free layer are parallel) and a second state with a high resistance (the AP-state, magnetization directions of the reference layer and free layer are antiparallel), to store data.

權利要求

1
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