OTP Memory Cell Anti-Fuse Programming at Lower Voltages
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The miniaturization of transistors in semiconductor manufacturing introduces challenges in programming one-time programmable (OTP) memory cells due to high voltages exceeding junction breakdown voltages, leading to programming inefficiencies and failures.
Innovation Solution
The OTP memory cell design includes an anti-fuse element and a selection circuit that controls electrical connections based on word line voltages, causing channel damage during programming to induce a read current for bit value identification, allowing operation at lower voltages using advanced nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional programming operations are used with high voltages, then programming can be achieved, but the voltage exceeds the junction breakdown voltage of advanced node transistors, causing programming inefficiencies or failures
Solution Approach 1:
The patent changes the programming mechanism from direct high-voltage gate control to channel damage induction through controlled stress, fundamentally altering the physical parameter space. Instead of applying high voltage to the gate (traditional method), the invention applies stress to damage the channel, enabling programming at lower voltages suitable for advanced nodes while maintaining reliability
Solution Approach 2:
The patent replaces the electrical field-based programming mechanism (high voltage applied to gate) with a mechanical stress-based mechanism (channel damage through controlled stress application). This substitution allows programming to occur at lower voltages that do not exceed junction breakdown limits in advanced node transistors
2Use of energy by moving object
If transistor size is reduced to advance manufacturing nodes, then circuit area and power consumption are reduced, but voltage tolerance decreases making programming difficult
Solution Approach 1:
The patent changes the programming approach from voltage-controlled to stress-controlled channel damage, enabling operation at lower voltages that match the reduced voltage tolerance of advanced node transistors while maintaining programming reliability
Solution Approach 2:
The patent converts the harmful effect of channel damage (which normally degrades transistor performance) into a beneficial programming mechanism. By intentionally inducing controlled channel damage through stress, the patent achieves reliable programming in advanced node transistors that cannot tolerate high programming voltages
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 effective programming and reading of OTP memory cells with lower program voltages, facilitating the use of smaller transistors and reducing programming failures, while maintaining efficient bit value identification.
Implementation Method 1
When the OTP memory is programmed by a program operation, a channel between the first terminal and the second terminal of the anti-fuse element is damaged
Data Source
AI summary
A one-time programmable (OTP) memory cell includes an anti-fuse element and a selection circuit. The anti-fuse element includes a first terminal, a second terminal coupled to a program line, and a gate terminal. The selection circuit is coupled to the first terminal of the anti-fuse element, a word line, and a bit line. The selection circuit controls an electrical connection between the bit line and the first terminal of the anti-fuse element according to a voltage of the word line. The OTP memory cell is programmed by a program operation, and a channel between the first terminal and the second terminal of the anti-fuse element is damaged by the program operation.