Flash Memory Voltage Generating Circuit Leakage Management
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Solution Overview
Problem
Flash memory devices face challenges in generating and maintaining accurate and stable voltage levels for programming, erasing, and reading data, particularly due to leakage currents that cause voltage fluctuations, which affect the performance of multi-level cell storage.
Innovation Solution
A voltage generating circuit comprising a charge pump, first and second type voltage regulators, and a selection circuit that generates and applies constant voltages to the memory cell array, with the ability to discharge leakage currents through a voltage division path, ensuring stable voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple voltage levels are generated for multi-level cell storage, then data storage capacity increases, but voltage stability deteriorates due to leakage currents
Solution Approach 1:
The voltage generating circuit is divided into multiple independent voltage regulators (first voltage regulator, second voltage regulator, third voltage regulator) that separately generate different voltage levels (first voltage, second voltage, third voltage). Each regulator independently manages its own voltage output, preventing leakage currents in one regulator from affecting the stability of voltages generated by other regulators. This segmentation allows multi-level cell storage with multiple voltage levels while maintaining voltage stability through independent regulation.
2Manufacturing precision
If voltage levels are increased for programming and erasing operations, then data storage capability improves, but voltage fluctuation increases due to leakage currents
Solution Approach 1:
Each voltage regulator is equipped with feedback mechanisms that continuously monitor the generated voltage levels and adjust their output accordingly. The first voltage regulator monitors and adjusts the first voltage, the second voltage regulator monitors and adjusts the second voltage, and the third voltage regulator monitors and adjusts the third voltage. This feedback control compensates for voltage fluctuations caused by leakage currents, ensuring stable and precise voltage levels for programming and erasing operations in multi-level cell flash memory.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables precise and stable application of voltages for program, erase, and read operations, reducing voltage fluctuations and enhancing the performance of flash memory devices by effectively managing leakage currents.
Implementation Method 1
The charge pump is for generating a voltage higher than a power voltage through charge-pumping
Implementation Method 2
The voltage generating circuit discharges a leakage current supplied by the selection circuit through a voltage division path, which generates the constant voltages
Data Source
AI summary
A flash memory device and a voltage generating circuit for the same. The flash memory includes a memory cell array configured with a plurality of memory cells, a voltage generating circuit for generating a plurality of constant voltages to be applied to the memory cell array, and a selection circuit for selecting one constant voltage among the plurality of the constant voltages and applying the selected one constant voltage to the memory cell array. The voltage generating circuit discharges a leakage current input by the selection circuit through a voltage division path, which generates the constant voltages.