Invention Grant
- Patent Title: Method and apparatus of operating a non-volatile DRAM
- Patent Title (中): 操作非易失性DRAM的方法和装置
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Application No.: US12800894Application Date: 2010-05-25
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Publication No.: US08391078B2Publication Date: 2013-03-05
- Inventor: Wingyu Leung
- Applicant: Wingyu Leung
- Applicant Address: US CA San Jose
- Assignee: Chip Memory Technology, Inc.
- Current Assignee: Chip Memory Technology, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Saile Ackerman LLC
- Agent Stephen B. Ackerman; Billy Knowles
- Main IPC: G11C11/34
- IPC: G11C11/34 ; G11C16/04

Abstract:
A non-volatile DRAM cell includes a pass-gate transistor and a cell capacitor. A read operation of the non-volatile cell begins by positively charging the cell capacitor. A cell capacitor of an associated dummy non-volatile DRAM cell is fully charged. The pass-gate transistor is activated and if the pass-gate transistor is erased it does not turn on and if it is programmed, it turns on. Charge is shared on the complementary pair of pre-charged bit lines connected to the non-volatile DRAM cell and its associated Dummy non-volatile DRAM cell. A sense amplifier detects the difference in the data state stored in the pass-gate transistor. The program and erase of the non-volatile DRAM cell is accomplished Gate-induced drain-lowering (GIDL) assisted band-to-band tunneling and Fowler-Nordheim tunneling respectively. Programming or erasing a selected row of cells does not affect the data states of the cells in the unselected rows.
Public/Granted literature
- US20100238728A1 Method and apparatus of operating a non-volatile DRAM Public/Granted day:2010-09-23
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