Variable Resistance Fuse Circuit for Flexible Post-Packaging Programming
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Solution Overview
Problem
Existing semiconductor memory devices, such as DDR SDRAM, rely on fuse circuits that are either area-intensive and complex or require precise control, limiting their efficiency and scalability.
Innovation Solution
An integrated circuit design that utilizes variable resistance units comprising transistors to change resistance in response to control signals, allowing for information storage without the need for traditional fuse circuits, by adjusting threshold voltage values during a programming mode and detecting these values in a normal operation mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a general fuse is used for information storage, then the area occupied is small, but the programming must be performed at wafer state which limits flexibility
Solution Approach 1:
The invention changes the programming state from wafer state to package state by modifying when and how the fuse is programmed. The fuse programming is performed after the semiconductor device is packaged, allowing flexible programming timing while maintaining the small area characteristics of general fuses. This is achieved through a programming circuit that can apply programming voltage to the fuse after packaging.
2Adaptability or versatility
If an anti-fuse is used for information storage, then programming can be performed in package state, but the area occupied is large and the structure is complicated
Solution Approach 1:
The invention merges the advantages of both general fuse and anti-fuse by combining the small area characteristic of general fuse with the package-state programming capability. The fuse is integrated with a programming circuit that enables post-packaging programming, eliminating the need for separate anti-fuse structures and their associated complexity.
Solution Approach 2:
A programming circuit acts as an intermediary between the external programming signal and the fuse. This intermediary enables the fuse to be programmed in package state without requiring the fuse itself to have anti-fuse characteristics, thus maintaining the simple structure and small area of the general fuse while achieving programming flexibility.
3Adaptability or versatility
If an anti-fuse is used for information storage, then programming can be performed in package state, but the structure becomes complicated and precise control technology is required
Solution Approach 1:
The invention extracts the programming functionality from the fuse structure itself and places it in a separate programming circuit. This separation allows the fuse to remain a simple general fuse structure while the programming circuit handles the complexity of package-state programming, eliminating the need for complex anti-fuse structures and precise control mechanisms within the fuse itself.
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
Enables efficient information storage in a smaller area without the complexity and area occupation of traditional fuse circuits, facilitating scalable and precise data storage in semiconductor memory devices.
Implementation Method 1
threshold voltage values of transistors may be adjusted by applying a desired voltage to input terminals of the transistors in the programming operation mode
Data Source
AI summary
An integrated circuit includes a variable resistance unit including at least one transistor that receives a control signal and changes a resistance through the transistor in response to the control signal in a programming operation mode and an information detection unit configured to detect programming information in response to an output voltage of the variable resistance unit in a normal operation mode.