Transmission Line Pulse Circuit for Multi-Standard ESD Waveforms
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Solution Overview
Problem
Current ESD test systems lack flexibility in generating a wide variety of voltage waveforms to meet different industry standards, posing challenges for vendors supplying parts or subsystems for multiple final product categories.
Innovation Solution
A transmission line pulse (TLP) system with networks of transmission lines of varying lengths and impedances, along with switches and terminations, allows for the generation of complex waveforms by connecting and disconnecting transmission lines in parallel and series configurations, enabling the creation of diverse voltage waveforms consistent with various industry standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single transmission line is used for ESD testing, then the system is simple, but it cannot generate complex voltage waveforms required by different industry standards
Solution Approach 1:
The system divides a complex waveform generation task into multiple simpler transmission line segments. Each transmission line section can generate basic voltage pulses, and by combining multiple sections with different lengths and impedances, the system can produce complex multi-level waveforms required by various ESD standards without needing completely different test systems for each standard.
Solution Approach 2:
The patent creates a universal test system that can generate multiple types of ESD waveforms (Human Body Model, Automotive, IEC 61000-4-2, etc.) using a single configurable transmission line network. By adjusting the configuration of transmission line sections, terminations, and switching elements, the same physical system can adapt to different industry standards, eliminating the need for multiple dedicated test systems.
2Adaptability or versatility
If transmission line sections are configured to generate multi-level voltage pulses, then complex waveforms can be produced, but the system complexity increases with multiple transmission line sections and impedance discontinuities
Solution Approach 1:
The system employs dynamic switching elements that can reconfigure the transmission line network in real-time. By using switches to dynamically connect or disconnect transmission line sections and adjust termination impedances, the system can adapt its configuration to generate different multi-level waveforms as needed, rather than requiring fixed complex hardware for each waveform type.
Solution Approach 2:
The patent utilizes adjustable parameters such as transmission line length, characteristic impedance, and termination resistance to control waveform characteristics. By changing these parameters across different transmission line sections and configurations, the system can generate various multi-level voltage pulses required for characterizing protective devices at different current levels without fundamentally changing the system architecture.
3Reliability
If industry-specific ESD test systems are used, then each standard can be tested accurately, but vendors supplying parts for multiple product categories need multiple separate test systems
Solution Approach 1:
The patent designs a universal ESD test system capable of complying with multiple industry standards (JEDEC, Automotive, IEC 61000-4-2, etc.) through a single configurable platform. The system uses programmable transmission line networks and switching matrices to generate the specific waveform requirements of each standard, allowing vendors to maintain one reliable test system rather than multiple separate systems for different product categories.
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 system can produce a wide range of voltage waveforms, including multilevel and bipolar waveforms, capable of replicating standard ESD test results across multiple industries, and provides higher current delivery, addressing the need for flexibility and compliance with various ESD test standards.
Implementation Method 1
The transmission line generates a single voltage pulse with a pulse width determined by the propagation time along the length of the transmission line
Implementation Method 2
The voltages are partially reflected in each section of the transmission line at each impedance discontinuity
Data Source
AI summary
A circuit and method for electrostatic discharge testing using transmission line pulsing. A plurality of transmission line networks may be connected to a device under test, and each transmission line network may have different connected terminations. Switches may be used to select which transmission line networks are connected to the device under test, and which terminations, if any, are connected to transmission line networks.