Patent ID: 9171632
Filing Date: 2015-10-27
Classification: G11C,H01L

Abstract:
1. A method for operating a 3D stacked non-volatile memory device comprising multiple levels of memory cells in a stack, the method comprising: performing a read operation for a selected memory cell in a selected string of the memory device, the performing a read operation comprises applying a control gate voltage to a selected word line layer of the memory device which is connected to the selected memory cell, while providing a drain-side select gate of the selected string in a conductive state, and while sensing a threshold voltage of the selected memory cell; and controlling a boosting level of a channel of an unselected string in the memory device during the read operation, the controlling comprises allowing boosting of the channel followed by interrupting boosting of the channel, the allowing boosting of the channel comprise applying an increasing pass voltage to an unselected word line layer of the memory device while providing drain-side and source-side select gates of the unselected string in a non-conductive state, and the interrupting boosting of the channel comprises transitioning at least one of the drain-side and source-side select gates of the unselected string from the non-conductive state to the conductive state.