Flash Memory Voltage Trimming Circuit
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Solution Overview
Problem
The existing methods for trimming internal voltages in flash memory devices, particularly in multi-level cell (MLC) applications, are time-consuming and labor-intensive, as they require precise adjustment of multiple voltage sources, which increases exponentially with the number of memory devices and voltage levels.
Innovation Solution
The implementation of an internal voltage generator with an on-board trimming circuit that can simultaneously adjust multiple voltage outputs based on a test voltage, reducing the need for individual monitoring and adjustment by a tester, and incorporating a voltage detector circuit with a trimming resistor to regulate voltage levels accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual voltage sources are adjusted separately to achieve precise voltage levels, then voltage accuracy is improved, but the time and labor required for trimming increases exponentially
Solution Approach 1:
The patent combines multiple voltage source adjustments into a single unified trimming operation. By connecting multiple voltage sources to a common trimming circuit, the system can adjust all voltage levels simultaneously through one set of trimming terminals, rather than requiring separate adjustments for each voltage source. This merging approach maintains voltage accuracy while dramatically reducing trimming time and labor.
Solution Approach 2:
The trimming circuit is designed with universal applicability to multiple voltage sources. A single trimming circuit configuration can serve multiple voltage generation functions, allowing the same circuitry to regulate different voltage levels (e.g., Vcc, Vpp, Vqq) through common trimming terminals. This multi-functional design eliminates the need for dedicated trimming circuits for each voltage source.
2Quantity of substance
If the number of voltage sources increases to support MLC applications, then storage capacity is improved, but the complexity of voltage regulation increases
Solution Approach 1:
The patent segments the voltage regulation function into modular voltage generation circuits, each capable of being independently trimmed. By dividing the overall voltage regulation system into separate but similar modules (each with its own trimming terminals), the system can handle multiple voltage sources required for MLC operations without creating a monolithic complex regulation system. Each segment can be adjusted independently while following the same trimming methodology.
Solution Approach 2:
The patent employs parameter changes through trimming resistors that can be adjusted to modify voltage levels. By changing the resistance parameters in the trimming circuits, the system can regulate multiple different voltage levels (for program, read, verify, and erase operations) using the same circuit architecture. This parameter-based approach allows flexible voltage control without increasing structural complexity.
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
This approach significantly reduces the time and effort required for voltage trimming, allowing for precise and efficient regulation of voltages across multiple memory devices, enhancing data accuracy and reducing operational costs.
Implementation Method 1
a voltage detector circuit with a trimming resistor to regulate voltage levels accurately
Implementation Method 2
The trimming circuit may include a controller, a latch and a multiplexer. The voltage detector circuit includes a voltage divider with a first resistor and a trimming resistor disposed in series between a first node and ground.
Data Source
AI summary
Embodiments are provided that include a memory die, memory devices, and methods, such as those comprising a voltage generator, including an output voltage and an adjustment circuit configured to cause adjustment of the output voltage based on a latch signal. Further one such method includes applying an input voltage to an input of a voltage generator, adjusting the input voltage to an adjusted voltage, comparing the adjusted voltage to a reference voltage, generating trim data based on the comparison and storing the trim data.