The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 12, 2024
Filed:
Sep. 22, 2022
Yangtze Memory Technologies Co., Ltd., Hubei, CN;
Kaijin Huang, Hubei, CN;
Yangtze Memory Technologies Co., Ltd., Hubei, CN;
Abstract
The present disclosure provides a method of erase and erase verification for a memory device. The method includes applying a first erase voltage to erase memory cells of the memory device. The first erase voltage is incrementally increased by a first erase step voltage until the memory cells pass an initial erase verification. The method also includes determining whether the memory cells pass or fail sub-erase verifications by applying sub-erase verification voltages. The method further includes applying a second erase voltage to erase the memory cells after the sub-erase verifications. The second erase voltage is increased from the first erase voltage by a second erase step voltage, which is smaller than the first erase step voltage and is determined according to whether the memory cells pass or fail the sub-erase verifications.