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:
Feb. 18, 2025
Filed:
Jul. 21, 2023
Western Digital Technologies, Inc., San Jose, CA (US);
Sandisk Technologies, Inc., Milpitas, CA (US);
Abstract
Technology is disclosed for testing a 3D memory structure. The 3D memory structure has blocks with layers of word lines. Each word line is connected to control gates of NAND memory cells. The 3D memory structure may be tested while concurrently applying a set of layer dependent voltages to a corresponding set of word lines. The magnitude of each layer dependent voltage may depend on which layer the word line to which the voltage is applied resides. There may be physical differences between the different layers such as differences in the diameters of the memory holes in which NAND string are formed. The layer dependent voltages provide for a more accurate test in view of these and other physical differences between the different layers.