Asymmetric ESD Sensor Antennas for IC Sensitivity
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Solution Overview
Problem
Conventional integrated circuits lack sensitivity in detecting and quantifying electrostatic discharges, which can cause material degradation during manufacturing, particularly in MOS transistors, and existing solutions fail to identify subtle deviations in component characteristics.
Innovation Solution
An integrated circuit with an electrostatic-discharge sensor featuring a semiconductor structure and a network of metal antennas with asymmetries in shape and size, amplifying differences in electrostatic charge accumulation and discharge dynamics to enhance detection sensitivity, allowing for multiple measurements of various link types between nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection solutions are used, then device complexity is reduced, but measurement precision and sensitivity are insufficient to detect weak electrostatic discharges
Solution Approach 1:
The patent applies asymmetry by designing metal antennas with different surface areas connected to different nodes. This asymmetric configuration creates different charge accumulation capacities on each node, amplifying potential differences during electrostatic discharge events. The asymmetry enables detection of weak ESD phenomena that conventional symmetric structures cannot detect, directly improving measurement precision while maintaining reasonable device complexity.
Solution Approach 2:
The patent introduces a new dimension of detection by using multiple pairs of nodes with different link types (resistive, capacitive, PN-junction) arranged in a structured semiconductor configuration. This multi-dimensional approach allows simultaneous detection of various ESD mechanisms through different physical links, enhancing overall detection sensitivity and measurement capability without proportionally increasing complexity.
2Adaptability or versatility
If conventional detection methods are used, then ease of manufacture is improved, but the ability to identify and quantify electrostatic discharge phenomena is limited
Solution Approach 1:
The sensor structure achieves multi-functionality by incorporating multiple pairs of nodes with different link types (resistive links via conductive bars, capacitive links via dielectric layers, PN-junction links via doped regions). Each link type detects different aspects of electrostatic discharge phenomena, allowing a single sensor structure to provide comprehensive ESD characterization across multiple measurement dimensions, thereby improving adaptability while remaining manufacturable using standard semiconductor processes.
3Reliability
If preventive solutions like dedicated diodes are used, then reliability is improved by evacuating electrostatic discharges, but the ability to detect and quantify ESD phenomena is lost
Solution Approach 1:
The patent introduces a dedicated sensor structure as an intermediary system that coexists with preventive ESD protection mechanisms. The sensor acts as a mediator by providing a controlled path for ESD detection through its specialized node pairs and links, allowing simultaneous ESD protection and characterization. The sensor structure captures ESD phenomena for measurement without interfering with the primary protective functions, thus maintaining both reliability and detection capability.
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 sensor significantly increases sensitivity to detect weak electrostatic discharges that may cause characteristic deviations, providing a multitude of measurements to identify and quantify electrostatic discharge phenomena, thereby evaluating potential damage to integrated circuit components.
Implementation Method 1
antennas of the network of antennas having an asymmetry in shape and/or in size, respectively connected to said nodes of each pair. The asymmetries in shape and in size of the antennas respectively connected to the two nodes of each pair of the sensor allow to amplify a difference in the accumulation of electrostatic charges on the physical nodes
Implementation Method 2
the sensor including at least one pair of two nodes having a resistive link or a capacitive link or a PN-junction link in the semiconductor structure
Implementation Method 3
the sensor including at least one pair of two nodes having a resistive link or a capacitive link or a PN-junction link in the semiconductor structure
Data Source
AI summary
An integrated circuit is formed by a semiconductor part with a semiconductor substrate and an interconnection part including levels of metals. An electrostatic-discharge sensor includes a semiconductor structure in the semiconductor part and a network of metal antennas in the interconnection part. The electrostatic-discharge sensor has at least one pair of two nodes having one of a resistive link or a capacitive link or a PN-junction link in the semiconductor structure. The antennas of the network of antennas coupled to the nodes of the least one pair of two nodes exhibit an asymmetry in one or more of shape and size.