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ELECTROSTATIC DISCHARGE PROTECTION CIRCUIT FOR FLOATING ANTENNA

IP.com Disclosure Number: IPCOM000005783D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2001-Nov-06
Document File: 1 page(s) / 81K

Publishing Venue

Motorola

Related People

Eric Eaton: AUTHOR [+3]

Abstract

In miniature mobile communication devices such as pagers, portable radios or cellular telephones, it may become necessary due to size constraints to make the antenna an integraal part of the housing. This increases the susceptibility of the antenna and its receiver fo electmstafic discharged transients. The following publica- tion is intended to give a working solution to resolve ESD problems on these types of communication devices.

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MOTOROLA Technical Developments Volume 9 August 1999

ELECTROSTATIC DISCHARGE PROTECTION CIRCUIT FOR FLOATING ANTENNA

by Eric Eaton, Rodney Whaley, James Ian Jaffee

Abstract:

   In miniature mobile communication devices such as pagers, portable radios or cellular telephones, it may become necessary due to size constraints to make the antenna an integraal part of the housing. This increases the susceptibility of the antenna and its receiver fo electmstafic discharged transients. The following publica- tion is intended to give a working solution to resolve ESD problems on these types of communication devices.

   In orderto stay competitive in an international market place products must survive electrostatic discharge (ESD) transients. Therefore, it is important that all new product designs keep this requirement in mind during the initial development stages of the product.

   Electrostatic charges are generated when two different materials are brought in contact with each other and then separated. This separation results in a positive charge on the material which is higher on the tribolec- tric series, and an equal (-) charge on the material lower in the same series. Triboelectric tables can be found in many ESD handbooks or text books.

   Both the American National Standards Institute (ANSI) and the International Electrotechnical Commission (IEC) are presently negotiating new international ESD testing standards. One of the new standards main thrust is the use of direct-contact discharge to all conductive surfaces and planes. The IEC draft also suggests at least 10 single discharges per point 5 of which should be positive, and 5 of which should be negative. These discharge pulses should have a minimum spacing of 1 second intervals. Therefore, any protection circuit must be capable of handling both polarities of transients. There are several components currently in the market place that will give a low impedance path to a...