Hybrid Analog Digital Memory Cell With Adjacent Sensor
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Solution Overview
Problem
Current non-volatile memory devices, such as flash memory, face limitations in storage density and read/write throughput due to the direct detection of charge on floating gates, which is not efficiently scalable for representing multiple bits.
Innovation Solution
Incorporating an analog sensor element adjacent to the floating gate transistor, allowing the electrical characteristic of the sensor to represent multiple bits, with digital-to-analog and analog-to-digital converters for efficient data conversion and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct charge detection on floating gates is used, then memory device simplicity is maintained, but storage density and read/write throughput are limited
Solution Approach 1:
The patent introduces an analog sensor element as an intermediary between the floating gate and the read circuitry. This sensor element converts the charge state of the floating gate into an analog signal that can represent multiple bits, thereby increasing throughput without requiring multiple floating gates per bit. The intermediary enables efficient scaling from single-bit to multi-bit storage while maintaining a relatively simple device structure.
2Device complexity
If direct charge detection on floating gates is used, then device structure remains simple, but storage density increases are limited
Solution Approach 1:
The patent changes the parameter representation by using an analog sensor element that outputs a continuous or multi-level analog signal instead of a simple binary state. This allows a single memory cell to represent multiple bits by varying the analog parameter (such as current, voltage, or resistance level), thereby increasing storage density without proportionally increasing device complexity.
3Quantity of substance
If analog sensor element is added to represent multiple bits, then storage density increases, but device complexity increases
Solution Approach 1:
The analog sensor element serves multiple functions: it detects the charge state of the floating gate, converts it into a multi-level signal, and enables multi-bit storage capability. This single component performs what would traditionally require multiple separate components, thereby increasing storage density while limiting the growth of device complexity.
4Productivity
If analog sensor element with converters is used, then read/write throughput increases, but manufacturing complexity increases
Solution Approach 1:
The patent replaces traditional digital read/write mechanisms with an analog sensing and conversion system. The analog sensor element directly converts charge states to analog signals, and the DAC/ADC converters handle the digital-analog transitions. This substitution enables faster read/write operations by eliminating multiple digital switching steps, though it introduces analog manufacturing considerations that require precise control of sensor characteristics.
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 enables increased storage density and faster read/write operations by allowing a single memory cell to store multiple bits, enhancing memory capacity and throughput compared to traditional flash memory cells.
Implementation Method 1
a floating gate transistor including a floating gate... an electrical characteristic of the analog sensor element is affected by the amount of charge on the floating gate
Implementation Method 2
the write circuitry includes a digital-to-analog converter
Implementation Method 3
the read circuitry includes an analog-to-digital converter
Data Source
AI summary
A memory cell including a floating gate transistor including a floating gate, and an analog sensor element adjacent to the floating gate, where an electrical characteristic of the analog sensor element is affected by an amount of charge on the floating gate.