ESD Detector With Separate Channels For Positive And Negative Discharge
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Solution Overview
Problem
Existing ESD detectors are costly and cannot be integrated into integrated circuits due to antenna size constraints, and they can only detect positive electro-static discharge events, limiting their usefulness.
Innovation Solution
A method for forming an ESD detector with separate channels for detecting positive and negative electro-static discharge events, using back-to-back diodes and zener diodes to limit voltage and translate signals, allowing for integration onto an integrated circuit and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an antenna is used to detect ESD events, then detection capability is provided, but the device size and cost increase making integration into integrated circuits difficult
Solution Approach 1:
The patent extracts the antenna function from the ESD detection system and replaces it with a compact integrated circuit-based detection mechanism. The ESD detector uses direct coupling to sensing circuits without requiring an external antenna, thereby eliminating the space-consuming antenna component while maintaining ESD event detection capability through voltage threshold detection using transistors and diodes.
Solution Approach 2:
The patent replaces the physical antenna structure with an electronic field-based detection system. Instead of using a mechanical/electromagnetic antenna to capture ESD events, the invention uses electric field coupling through capacitive sensing and voltage threshold detection circuits, substituting a bulky physical structure with a compact electronic sensing mechanism that integrates directly into the circuit.
2Reliability
If an antenna is used to detect ESD events, then detection capability is provided, but the device cost increases
Solution Approach 1:
The patent removes the antenna component and its associated cost from the ESD detection system. By using direct voltage threshold detection through integrated circuit elements (transistors, diodes, capacitors), the invention eliminates the need for expensive antenna materials and assembly processes, thereby reducing overall device cost while maintaining detection functionality.
Solution Approach 2:
The patent employs inexpensive integrated circuit components (standard transistors, diodes, and capacitors) to replace the more costly antenna-based detection system. These standard semiconductor components are mass-producible and low-cost, making the overall detector economically viable for integration into consumer electronics while providing reliable ESD detection.
3Device complexity
If a single-channel ESD detector is used, then circuit complexity is reduced, but only positive electro-static discharge events can be detected
Solution Approach 1:
The patent divides the ESD detection function into separate channels: one channel detects positive ESD events while another channel detects negative ESD events. Each channel uses dedicated sensing circuits with appropriate voltage threshold detection, allowing the system to handle both polarities of ESD events independently without interference, thereby increasing versatility while maintaining manageable circuit complexity through modular design.
Solution Approach 2:
The patent creates a universal ESD detection system that can detect both positive and negative electro-static discharge events using the same basic detection architecture. By implementing dual-channel detection with complementary circuit configurations, the detector achieves multi-functionality, capable of responding to ESD events regardless of polarity, thus enhancing adaptability without proportionally increasing complexity.
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 the detection of both positive and negative ESD events within a nanosecond, reducing the size and cost of the detector while maintaining high detection accuracy, as per the IEC 61000-4-2 specification.
Implementation Method 1
a first and second zener diode to limit a maximum value of a voltage applied to the detector circuits to a value that is less than a maximum ESD voltage
Implementation Method 2
the detector circuits to translate the voltage to a second lower value to form a signal indicating that the ESD is detected
Data Source
AI summary
In one embodiment, and electro-static discharge detector is formed with a plurality of channels and is configured to detect a positive electro-static discharge and a negative electro-static discharge.