3D Memory Channel Precharge Control for Program Disturbance

The patent applies different precharge times to different regions of the memory block based on their susceptibility to disturbance. Word lines are divided into first and second groups, where the first group (more prone to disturbance) receives a first precharge time and the second group (less prone) receives a second precharge time. This localized differentiation resolves the contradiction by maintaining reliability in critical regions while preserving the high capacity benefits of 3D stacking.

The patent changes the time parameter of the precharge operation based on the selected word line position. When a word line from the first group is selected, a first precharge time is applied; when a word line from the second group is selected, a second precharge time is applied. This dynamic parameter adjustment resolves the contradiction between high density and reliability by adapting the precharge duration to the specific operational context.

The patent recognizes that smaller memory cells in certain regions (first group word lines) are more susceptible to disturbance and applies a differentiated precharge strategy. By identifying regions with higher disturbance risk and applying extended precharge times specifically to those regions, the patent resolves the contradiction between high density and resistance to harmful effects.

The patent applies preliminary precharge operations before the actual program operation to counteract potential disturbances. By precharging the channel layer in advance with appropriate timing based on the selected word line group, the patent creates a protective state that prevents disturbance from occurring in the first place, thereby maintaining reliability despite reduced cell size.

The patent divides word lines into distinct groups (first and second groups) with different disturbance characteristics and applies different precharge times to each group. This localized approach maintains operational simplicity through systematic classification while effectively preventing disturbances in vulnerable regions, resolving the contradiction between ease of operation and reliability.

The patent segments the word lines into multiple groups based on their susceptibility to disturbance. By dividing the word line set into first and second groups with different precharge requirements, the patent creates a manageable segmented structure that balances operational simplicity with effective disturbance prevention through targeted precharge strategies.