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Method for an electrostatic discharge event detectormagnetic loop antenna

IP.com Disclosure Number: IPCOM000007590D
Publication Date: 2002-Apr-08
Document File: 5 page(s) / 253K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for an electrostatic discharge (ESD) event detector-magnetic loop antenna. Benefits include improved testing and manufacturing environment.

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Method for an electrostatic discharge event detector–magnetic loop antenna

Disclosed is a method for an electrostatic discharge (ESD) event detector-magnetic loop antenna. Benefits include improved testing and manufacturing environment.

Background

              ESD is a two-step process: 1) electrostatic charging, 2) electrostatic discharging. The object generates charges (electrostatic charging) through friction or triboelectric charging, and then discharges through any grounded conductor (electrostatic discharging).

              Conventionally, the tools available in the marketplace mainly detect electrostatic charging (for example, field meter and Faraday cup). However, no effective tool or method exists that detects an electrostatic discharging event.

Description

              The disclosed method provides an effective method to detect an ESD event by using a magnetic loop antenna. It detects the electromagnetic (EM) field and the translation (gain) to the actual electrostatic discharge voltage from the EM waveform.

              The disclosed method makes use of the electromagnetic field emitted from the ESD event. During an ESD event, current flows from the charged object to any conductor. The current flowing through the conductor emits the magnetic field (B). A variation of the magnetic field produces an electric field (E), which then emits the electromagnetic field (EM field). The antenna detects the EM field from the ESD event (see Figure 3).

              The magnetic loop antenna is unshielded. The loop diameter is 3 inches. The inductance of the loop wire is 0.51 µH at 10 KHz, and total inductance with 50-ohm co-axial cable is 2.23 µH at 10 KHz. The 50-ohm coaxial cable is connected to the digital oscilloscope for capturing the EM waveform. To use the disclosed application, place the a...