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:
Mar. 19, 2019
Filed:
Apr. 23, 2018
Sandisk Technologies Llc, Plano, TX (US);
Ching-Huang Lu, Fremont, CA (US);
Swaroop Kaza, San Jose, CA (US);
Piyush Sagdeo, San Jose, CA (US);
SanDisk Technologies LLC, Addison, TX (US);
Abstract
Apparatuses and techniques are described for performing a pre-read operation in preparation for a read operation in a memory device. The pre-read operation transitions the memory cells from a first read condition to a second read condition so that their threshold voltages will be in a desired, predictable range when the read occurs. The pre-read operation can involve maintaining voltages on a selected word line and unselected word lines at specified levels and for a specified duration which is relatively long compared to a duration of the read operation. The word line voltages, in combination with bit line and source line voltages, provide the channels of a NAND string in a conductive state and gradually transitions the memory cells to the second read condition.