Static information storage and retrieval – Floating gate – Particular biasing
Patent
1998-08-03
2000-10-17
Nguyen, Tan T.
Static information storage and retrieval
Floating gate
Particular biasing
36518528, 36518511, G11C 1600
Patent
active
061341452
ABSTRACT:
A non-volatile semiconductor memory includes: multiple write pipelines, each including a memory array; a timing circuit which sequentially starts programming operations in the pipelines; and a shared charge pump and voltage regulation circuit that drives a current through the memory cells being programmed. Staggering the starts of programming operations reduces the current demand on the charge pump because spikes that occur at the starts of programming operations, for example, when using channel hot electron injection, are distributed over time rather than occurring all at once. Noise, which can reduce the accuracy of write operations, is also reduced because the total current required from the charge pump is more nearly constant. As further aspect of the invention, each write pipeline can perform a write operation as alternating programming cycles and verify cycles. During a programming cycle, the shared charge pump drives a current through a selected memory cell to change the threshold voltage of the selected memory cell. During a verify cycle, the write circuit determines whether the selected memory cell has reached its target threshold voltage level. The write pipelines can be partitioned into two banks where pipelines in one bank perform programming cycles while pipelines in the other bank perform verify cycles. More generally the write pipelines are partitioned into multiple banks where each bank starts programming cycles at times that differ from the starts of programming cycles in the other banks.
REFERENCES:
patent: 5394362 (1995-02-01), Banks
patent: 5519654 (1996-05-01), Kato et al.
patent: 5519847 (1996-05-01), Fandrich et al.
patent: 5680341 (1997-10-01), Wong et al.
patent: 5694356 (1997-12-01), Wong et al.
patent: 5712815 (1998-01-01), Bill et al.
patent: 5781474 (1998-07-01), Sali et al.
patent: 5784319 (1998-07-01), Villa et al.
patent: 5848013 (1998-12-01), Caser et al.
patent: 5867430 (1999-02-01), Chen et al.
Nguyen Tan T.
SanDisk Corporation
LandOfFree
High data rate write process for non-volatile flash memories does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High data rate write process for non-volatile flash memories, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High data rate write process for non-volatile flash memories will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-475688