Multi-Pin Electrical Testing via Multiplexed ESR and Reactance Measurement
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Solution Overview
Problem
Conventional ESD testing of multi-pin devices is time-consuming, prone to errors, and inconsistent due to the need for individual pin testing, which can lead to missed tests and inconsistent parameter settings, especially for devices like automotive controllers with hundreds of pins.
Innovation Solution
An apparatus with a connector, signal generator, multiplexer, and processor that simultaneously tests multiple pins by multiplexing signals, using a sinusoidal voltage signal below semiconductor activation levels, and performs FFT analysis to determine electrical characteristics like ESR and reactance, with automatic calibration and compensation to ensure accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual pin testing is performed using conventional techniques, then each pin can be tested for electrical characteristics, but the testing time becomes extremely long (up to 16 hours) and error-prone
Solution Approach 1:
The device under test is segmented into multiple pins, each connected to a separate input channel of the LCR meter through a multiplexer. This allows individual measurement of each pin's electrical characteristics while using a single measurement instrument, thereby maintaining measurement precision while reducing overall testing time.
Solution Approach 2:
The LCR meter is made multi-functional by using a multiplexer to switch between multiple input channels (pins). A single instrument performs measurements on all pins sequentially, eliminating the need for multiple instruments or manual reconfiguration, thus improving productivity without sacrificing measurement capability.
2Reliability
If multiple pins are tested individually using manual methods, then comprehensive testing coverage is achieved, but the scope for error increases significantly
Solution Approach 1:
The system incorporates automatic control through a microcontroller that manages the multiplexer switching and data acquisition for each pin. This automated feedback loop ensures consistent measurement parameters are applied to each pin and that all pins are tested systematically, eliminating manual errors while maintaining comprehensive coverage.
Solution Approach 2:
The testing system performs self-configuration and self-measurement by automatically switching between pins through the multiplexer and collecting electrical characteristic data without external intervention. This self-service capability ensures consistent, repeatable measurements across all pins while maintaining complete test coverage.
3Measurement precision
If testing parameters are manually configured for each pin, then measurement accuracy can be maintained, but the complexity and time required for setup increases
Solution Approach 1:
The measurement system is pre-configured with fixed testing parameters (signal frequency, amplitude, compensation values) that are applied automatically to all pins. This preliminary setup eliminates the need for manual parameter adjustment during testing, maintaining consistency while reducing operational complexity and setup time.
Solution Approach 2:
The system maintains measurement precision by keeping critical measurement parameters constant across all pins rather than allowing manual changes. The multiplexer enables parameter consistency by routing all measurements through the same configured LCR meter settings, thereby simplifying the system while preserving accuracy.
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
This approach significantly reduces testing time and errors by allowing simultaneous testing of multiple pins, ensuring reliable and repeatable results with minimal human intervention, while accurately determining device robustness post-ESD events.
Implementation Method 1
generating a sinusoidal voltage signal having an amplitude which is lower than a forward voltage of semiconductor components of the multi-pin device
Implementation Method 2
a multiplexer arranged to output a plurality of pin signals by selectively connecting the test signal to each of the plurality of pins
Implementation Method 3
performs FFT analysis to determine electrical characteristics like ESR and reactance
Implementation Method 4
By determining electrical characteristics such as the capacitance and dissipation factors of the device, using a device such as an LCR meter measuring inductance (L), capacitance (C) and resistance (R)
Data Source
AI summary
An apparatus for testing electrical characteristics of a multi-pin device includes a connector, a signal generator, a multiplexer, and a processor. The connector is connected to multiple pins of the multi-pin device. The signal generator is configured to generate a test signal. The multiplexer is arranged to output pin signals by selectively connecting the test signal to each of the pins through the connector. The processor is configured to determine electrical characteristics of the multi-pin device from the pin signals. The electrical characteristics are reactance and equivalent series resistance. The processor is arranged to determine capacitance and a dissipation factor for the multi-pin device from the determined reactance and equivalent series resistance.