Selectable Wordline Driver With Centralized Voltage Generation
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Solution Overview
Problem
Advanced DRAM devices, such as 3DDRAM, include drivers that provide a large range of voltages, leading to larger size and lower density due to numerous components, which is undesirable for compact memory device design.
Innovation Solution
Implement driver circuitry that selectively controls local wordlines with centralized global wordline voltage generation, reducing the need for components at each tier and minimizing the footprint of the memory device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If drivers with larger and more numerous components are used to provide large ranges of currents and voltages, then the voltage range and current capability are improved, but the device footprint and component count increase
Solution Approach 1:
The patent merges the global wordline voltage generation function into a single centralized driver circuit that serves multiple tiers of memory. Instead of having separate voltage generation components at each tier, one driver circuit generates voltages for global wordlines across all tiers, reducing the overall component count and device footprint while maintaining the required voltage range for advanced DRAM operations
2Power
If drivers with larger and more numerous components are used to provide large ranges of currents and voltages, then the voltage range and current capability are improved, but the component count and complexity increase
Solution Approach 1:
The patent combines multiple voltage generation functions into a single integrated driver circuit. This centralized approach consolidates what would otherwise be multiple separate components into one unit, reducing component count and circuit complexity while still providing the large voltage ranges needed for advanced DRAM device operation
Solution Approach 2:
The driver circuit is designed with multi-functionality to generate various voltages (e.g., VBL, VGL, VGD) for global wordlines across multiple tiers. This universal voltage generation capability allows a single component to perform what would traditionally require multiple specialized components, thereby reducing overall device complexity
Data Source
AI summary
A memory device includes one or more memory cells, a global wordline, a plurality of local wordlines each coupled to respective memory cells of the one or more memory cells, a wordline transistor coupled to the global wordline and to a local wordline of the plurality of wordlines, and voltage generation circuitry. The voltage generation circuitry may provide a global wordline voltage to the global wordline and provide a wordline select control signal to the wordline transistor. The wordline transistor may pull a local wordline voltage of the local wordline to the global wordline voltage based on the wordline select control signal.