Replaceable, precise-tracking reference lines for memory products
AssigneeMagIC Technologies, Inc.
InventorsLejan Pu, Toshio Sunaga
Life of this patent
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Abstract
Systems and methods to improve reliability of sensing operations of semiconductor memory arrays requiring reading references such as MRAM or any type of phase change memory (PCM), and to improve yield of the memory arrays have been achieved. The memory array is divided into multiple parts, such as sections or segments. Reference word lines or reference bit lines or both are deployed in each of the multiple parts. Thus, the distance between an accessed line and the correspondent reference line is reduced, and hence the parasitic parameter tracking capability is enhanced significantly. Additionally spare reference word lines or spare reference bit lines can be deployed in each of the multiple parts.
Claims33
A method to achieve reliable sensing operations for semiconductor memories requiring reading reference and to enhance the yield of the semiconductor memories, comprising the following steps:
- (1) providing a semiconductor memory array;
- (2) dividing the semiconductor memory array into multiple parts;
- and
- (3) deploying in each of said parts reference lines.
A semiconductor memory array requiring reading references with improved sensing operations reliability and enhanced yield comprises:
- a memory array being divided in multiple parts;
- and
- reference lines deployed in each of said multiple parts.
Dependencies are inferred from the claim text.