- Patent Title: Voltage-switched magneto-resistive random access memory (MRAM) employing separate read operation circuit paths from a shared spin torque write operation circuit path
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Application No.: US15639099Application Date: 2017-06-30
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Publication No.: US10224368B2Publication Date: 2019-03-05
- Inventor: Xia Li , Jimmy Jianan Kan , Seung Hyuk Kang , Bin Yang , Gengming Tao
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: W&T/Qualcomm
- Main IPC: G11C11/00
- IPC: G11C11/00 ; H01L27/22 ; H01L43/08 ; H01L43/02 ; G11C11/16

Abstract:
Voltage-switched magneto-resistive random access memory (MRAM) employing separate read operation circuit paths from a shared spin torque write operation circuit path is disclosed. The MRAM includes an MRAM array that includes MRAM bit cell rows each including a plurality of MRAM bit cells. MRAM bit cells on an MRAM bit cell row share a common electrode to provide a shared write operation circuit path for write operations. Dedicated read operation circuit paths are also provided for each MRAM bit cell separate from the write operation circuit path. As a result, the read operation circuit paths for the MRAM bit cells do not vary as a result of the different layout locations of the MRAM bit cells with respect to the common electrode. Thus, the read parasitic resistances of the MRAM bit cells do not vary from each other because of their different coupling locations to the common electrode.
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