E-fuse Circuit Feedback Control for Voltage Stability
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Solution Overview
Problem
Integrated circuits face issues with yield and device reliability due to process deviations and require an e-fuse circuit that can operate across a wide voltage supply range without damaging core devices.
Innovation Solution
An e-fuse circuit with a close loop feedback control system that clamps node voltages to a reference voltage, using a control switch and a leakage path to manage the blowing current, ensuring the e-fuse array operates safely and efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrical stress is applied to program the e-fuse array, then the e-fuse circuit can be programmed to repair process deviations and improve yield, but the blowing current may vary due to voltage supply variation, causing device reliability issues
Solution Approach 1:
A close-loop feedback control circuit is implemented to detect the actual voltage supplied to the e-fuse array and adjust the blowing current in real-time. The feedback circuit monitors voltage variations and dynamically compensates for them by controlling a variable resistance element, ensuring the blowing current remains stable despite voltage supply fluctuations, thus maintaining device reliability while enabling yield improvement through effective programming
2Productivity
If higher voltage supply is used to ensure sufficient blowing current for programming, then programming effectiveness is improved, but core devices may be damaged due to excessive voltage
Solution Approach 1:
The circuit employs dynamic control of a variable resistance element (such as a MOS transistor operating in triode region) that adjusts its resistance value in real-time based on the detected voltage supply level. When voltage is high, the variable resistance increases to limit current; when voltage is low, the variable resistance decreases to maintain sufficient current. This dynamic adjustment ensures programming effectiveness across wide voltage ranges while protecting devices from voltage-induced damage
3Reliability
If the e-fuse circuit operates with fixed blowing current, then device reliability is maintained, but the circuit cannot adapt to wide voltage supply variations
Solution Approach 1:
The circuit changes the resistance parameter of a controllable resistance element (MOS transistor) based on detected voltage conditions. The feedback circuit measures the actual voltage supplied to the e-fuse array and adjusts the resistance value accordingly, transforming the circuit from fixed-parameter to variable-parameter operation. This allows the circuit to maintain reliable blowing current across wide voltage supply variations by dynamically adapting its resistance parameter
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 close loop feedback control enhances yield and reliability by stabilizing node voltages, reducing blowing current variation, and allowing the e-fuse circuit to handle wider voltage supply variations, thus improving device reliability and operational stability.
Implementation Method 1
a close loop feedback circuit, coupled to the control switch and the e-fuse array, for clamping at least one node voltage of the e-fuse array to a reference voltage
Implementation Method 2
Electrical connection characteristics of the e-fuse used in the e-fuse circuit are changed when a laser beam or an electrical stress is applied to the fuse
Data Source
AI summary
An electronic-fuse (e-fuse) circuit includes: an e-fuse array; a control switch, coupled to the e-fuse array, for controlling whether a voltage supply is applied to the e-fuse array in programming; and a close loop feedback circuit, coupled to the control switch and the e-fuse array, for clamping at lease one node voltage of the e-fuse array to a reference voltage, and for controlling the control switch to control a blowing current in programming the e-fuse array.