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Electrostatic Discharge Testing and Simulations

Electrostatic discharge testing is utilized worldwide by electronics manufacturers to determine the ESD susceptibility of their devices. It is extremely difficult to estimate the exact cost of ESD loss annually, but it can safely be stated that ESD requires the development and testing of many hardware prototypes and contributes to a high number of warranty claims and loss of consumer confidence if failure occurs in the hands of the customer.

Given the high cost in time and materials associated with ESD hardware testing, the ability to simulate the ESD testing process in XFdtd is extremely valuable. Utilizing XFdtd's electrostatic discharge testing simulations allows engineers to pinpoint locations susceptible to ESD damage and optimize ESD mitigation during the concept and design stage of product development.

ESD testing simulation in XFdtd 3D EM Simulation Software

TVS Diodes

Integrated circuits are becoming more prevalent in the RF front end (RFFE) of devices. While they are supporting more functionality, they are also being reduced in size. The result is heightened susceptibility to ESD events and degradation. TVS diodes and other nonlinear ESD mitigation components protect the sensitive circuitry and redirect the strong ESD signals to ground before reaching the RFFE. XFdtd’s transient EM/circuit co-simulation capability allows these devices to be simulated in the full-wave environment where system-level analysis can be performed.


Dielectric Breakdown Prediction

Even for an experienced engineer it can be extremely challenging to pinpoint the location of an ESD failure during testing, and in some cases, to determine if a failure occurred at all. To solve this, the dielectric strength of materials can be defined in XFdtd. The dielectric strength of a material defines the maximum electric field it can withstand without experiencing dielectric breakdown (i.e., losing its insulating properties). Upon adding the dielectric strength of materials to an XFdtd project, it is possible to monitor FDTD cell edges for potential dielectric breakdown during transient simulations using a dielectric breakdown near field sensor. At the conclusion of an XFdtd simulation, cell edges which exceeded their dielectric strength can be easily located.


ESD Waveforms

ESD testing procedures and waveform models are defined by numerous standards from organizations including the American National Standards Institute (ANSI), JEDEC, and International Electrotechnical Commission (IEC), among others.  The human body model (HBM), which approximates a discharge from a charged human fingertip to a grounded device, and the charged device model (CDM), which approximates a discharge from a charged device to another conducting object at a lower electrostatic potential, are the most common and widely used ESD models.  These tests are generally performed using ESD Simulators, or ESD Guns, to apply high speed, high voltage pulses to various points of the device under test (DUT). Using XFdtd’s user defined waveform feature, engineers can import ESD waveforms defined by the various testing standards and use them to create ESD current sources in their XFdtd project.  At this point, ESD simulator/gun models can be created and used to excite the DUT geometry at locations of interest and the resulting electromagnetic fields and current flows can be simulated and analyzed.

Circuit Component Overvoltages and Overcurrents

Generally speaking, circuit component failure is encountered more frequently than dielectric breakdown failure during ESD testing.  To predict circuit component failures, rated voltage and current input parameters, which can be obtained from electronic component data sheets, can be added to XFdtd’s circuit component definitions.  Upon completion of an XFdtd simulation, components that exceeded their rated design parameters are reported by XFdtd’s Max Component Voltages and Currents result dialog.


Optimize ESD Mitigation

While simulation cannot and should not entirely replace hardware testing, it can provide ESD engineers with insight into probable locations of ESD failure and will allow ESD mitigation designs to be optimized prior to the hardware prototyping stage.  XFdtd’s ability to pinpoint locations at risk of experiencing dielectric breakdown and report circuit components exceeding their design parameters during an ESD event reduces product development costs and time to market, while improving product reliability and consumer confidence.

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