Programmable Fuse Memory Cell for RFID Data Security
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Solution Overview
Problem
Current RFID tags face issues with high energy consumption, long transaction times, limited memory capacity, and vulnerability to data corruption due to non-volatile memory limitations and susceptibility to high temperatures or radiation, which affects data authenticity and security.
Innovation Solution
A memory cell and identification tag design utilizing programmable fuses that connect with a latch to present electrical characteristics, allowing for efficient data storage and transmission, with programming performed using laser to ensure irreversibility and improved reliability, and implemented in a semiconductor fabrication facility for enhanced security and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-volatile memory (EEPROM) is used to store identification data in RFID tags, then data retention is improved, but energy consumption and transaction time increase significantly
Solution Approach 1:
The patent extracts the data storage function from traditional EEPROM memory and implements it using passive fuse structures that require no power for data retention. The fuse-based memory elements maintain their programmed state through their physical structure (open or closed circuit) rather than requiring electrical power, thereby eliminating the energy consumption associated with maintaining data in EEPROM while preserving data retention capability.
Solution Approach 2:
The patent employs simple fuse structures that are programmed once and then read indefinitely without degradation. The fuses are essentially disposable in terms of programming (they can be blown but not reprogrammed), but this one-time programming approach eliminates the need for complex, power-hungry memory cells and peripheral circuitry, reducing overall energy consumption while maintaining data integrity throughout the tag's operational life.
2Reliability
If non-volatile memory (EEPROM) is used to store identification data, then data retention is improved, but transaction time increases due to slow access speed
Solution Approach 1:
The patent removes the slow EEPROM memory access mechanism and replaces it with direct fuse-based storage. The identification data is stored in the fuse structures themselves, which can be sensed almost instantaneously by detecting whether the fuse is open or closed, eliminating the multi-step read cycle required by EEPROM and dramatically reducing transaction time.
Solution Approach 2:
The patent replaces the electrical/magnetic field-based EEPROM access mechanism with a simple electrical continuity check of the fuse structure. Instead of requiring complex memory cell access sequences and charge pump circuits, the system simply detects the presence or absence of electrical continuity through the fuse, enabling extremely fast data retrieval and reducing transaction time.
3Quantity of substance
If larger memory capacity is implemented in RFID tags, then data storage capability is improved, but area and power consumption increase due to peripheral circuitry
Solution Approach 1:
The patent uses simple fuse structures that require minimal circuitry to program and read. Each fuse is a basic resistive element that can be programmed with a laser or electrical pulse and then read with simple voltage detection. This approach provides high-density storage with minimal peripheral circuitry, as each fuse bit requires only basic readout circuitry rather than complex memory cell structures and charge pump circuits, thereby increasing memory capacity while reducing chip area.
4Quantity of substance
If traditional RFID tag memory is used, then data storage is achieved, but data authenticity and security are compromised due to vulnerability to rewriting and environmental damage
Solution Approach 1:
The patent performs the data programming action before the tag is deployed to the field, using laser or electrical programming during manufacturing. This preliminary programming establishes the identification data in the fuse structures in a controlled environment, and the one-time programmable nature of the fuses ensures that the data cannot be altered afterward, guaranteeing data authenticity and preventing unauthorized rewriting in the field.
Solution Approach 2:
The patent employs one-time programmable fuse structures that are essentially disposable in terms of rewriting capability. Once a fuse is programmed (blown), it cannot be changed, which provides inherent security against data tampering. This approach sacrifices the ability to rewrite data but gains significant improvements in data authenticity and security, as the programmed data remains immutable throughout the tag's operational life, even under extreme conditions.
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 reduces energy consumption and transaction time, enhances data reliability in extreme conditions, and improves data authenticity and security by using programmable fuses that are smaller and faster to sense, while ensuring that once-written data is fixed and secure.
Implementation Method 1
programmable fuses electrically connecting with the dedicated latch to present an electrical characteristic depending on how the fuses get programmed
Implementation Method 2
Programming programmable fuses with laser or breaking in layout may be irreversibly written the identification data
Data Source
AI summary
A memory cell includes: a latch, powered by a first reference voltage and a second reference voltage different from the first reference voltage, and having a first connecting terminal and a second connecting terminal; a first programmable fuse, having a first terminal coupled to the first connecting terminal and a second terminal coupled to the second reference voltage; and a second programmable fuse, having a first terminal coupled to the second connecting terminal and a second terminal coupled to the second reference voltage.