Column Select Driver Leakage Control via Pre-Header Circuit
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Solution Overview
Problem
The operational efficiency of computing systems is limited by leakage current through column select and row select circuitry in memory sub-systems, which also contributes to increased size due to duplicated transistor components.
Innovation Solution
The introduction of a pre-driver circuit within the column select circuitry to control the main driver, reducing leakage current and minimizing the physical size of the column select circuitry while maintaining or improving operational performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If column select circuitry uses main driver transistors to control bit line access, then operational control is achieved, but leakage current increases and circuit size increases due to duplicated transistor components
Solution Approach 1:
The column select circuitry is segmented into two distinct transistor types: pre-driver transistors (first set) and main driver transistors (second set). The pre-driver transistors control the gates of the main driver transistors, creating a hierarchical control structure that reduces leakage current while maintaining operational functionality. This segmentation allows each transistor set to be optimized for its specific function.
Solution Approach 2:
Pre-driver transistors act as intermediary control elements between the column select decoder and the main driver transistors. Instead of the decoder directly controlling main drivers, the pre-drivers serve as intermediate switches that manage the main driver gates, thereby reducing direct leakage paths while preserving the control signal transmission.
2Ease of operation
If column select circuitry uses duplicated transistor components for each column, then individual column control is achieved, but physical size of the circuitry increases
Solution Approach 1:
The transistor components are segmented into pre-driver and main driver functional groups. By controlling the number and arrangement of these segmented transistor sets across columns, the circuit achieves individual column control while optimizing the overall physical footprint through systematic placement and sharing of circuit elements.
Solution Approach 2:
The pre-driver transistor set serves multiple functions: it controls the main driver transistors for column selection and simultaneously reduces leakage current across multiple columns. This multi-functionality allows the same pre-driver structure to benefit multiple columns, reducing the need for completely independent control circuits for each column.
Data Source
AI summary
Embodiments herein relate to column select circuitry of a memory device. Specifically, the column select circuitry includes a pre-header circuit coupled to a pre-driver circuit. The pre-header circuit is configured to couple a gate of a transistor of a main column select driver circuit of the column select circuitry to a first voltage supply during operation and a second voltage supply when in a standby state. A voltage of the second voltage supply is greater than a voltage of the first voltage supply. The voltage of the second power supply applied to the gate of the transistor of the main column select driver circuit reduces current leakage through the transistor and enables a reduction in a size of the column select circuitry.