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| Why Filter at the connector instead of at the PCB level |
Filtering at the pins of any commercial or military connector provides solid ground plane paths around the filter components; plus it provides the lowest impedance path for the filter, while increasing the shielding effectiveness throughout the connector area.
Additionally, by using filtered connectors as opposed to filtering on the PWB; you eliminate the noise that will be picked up from the contacts/leads between the on board filters and the connector's interface, and free up the board space required to implement the filtering.
Filtered connectors are the best means of eliminating unwanted noise from any electronic system. There are some less expensive ways to filter at a board level, but none of these can outperform filtering at the interface. The parameters you have to consider when deciding on a filtered connector are as follows:
- Required Performance
- Available Space
- Component & PCB Costs
Increased Benefits using Filtered and TVS protected connectors
EMI Solutions has assembled a large series of product families especially designed to provide the best solution to meet the ever increasing performance demands, levied upon them by the testing requirements of standards like MIL-STD-461, RTCA-DO-160, CISPRE, FCC (part 15), FAA (AC20-136), SAE, Boeing (D6), NASA 30237/38, Airbus ABD00/100, MIL-STD-704, and MIL-STD-285. We offer filtering solutions from our unique filter inserts to our higher performing Pi filtered connectors.
The ground plane is the most important part of any filtered connector; It's primary purpose is to provide a low-impedance path for the filtering elements to "ground" to the inner shell of the connector; so, good shielding methodologies must be achieved for viable grounding paths from connector to chassis.
The ground plane's main purpose is to prevent any radiated energy or high-frequency noise from coupling onto the connector pins; or to the PC board termination at the engagement ends of the connector. Simply put, the ground plane essentially acts like an RF barrier that prohibits interference from breaking through to the opposite end of the connector.
The filter itself is comprised of either capacitive, or inductive elements that fit directly into the shell of the connector, and is then attached between the pin and the connector case via the filter insert assembly.
An important factor to remember is that any individual filter elements' electrical characteristics can differ with the introduction of the imposing environmental conditions; that can include changes in circuit impedance, component tolerance, ground resistance, temperature fluctuations, voltage fluctuations, current fluctuations, frequency fluctuations, and Ohmic heating (lightning).
Because of the increased demands for higher performance from our extensive customer base, our designs now include a newly developed and performance tested combination Filtered and TVS protection connector; which differs from anything available at present within the industry. All of our products are made with the highest quality materials available, in order to insure that they perform up to and beyond our customers' expectations.
Our Chip Cap series inserts and connectors provide up to 45 dB of insertion loss with the ability to have capacitive filtering from 10pf to 115,000pf; while our Pi filtered connectors offer up to 75-80 dB of insertion loss in a wide variety of capacitance values. The TVS components used provide transient protection at the pin of the connector from 0.1 Joules up to 2 joules (configuration dependant); and we also offer the ability to selectively filter or TVS protect pins within an insert or a filtered connector on a pin by pin basis.
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| Contact Us: |
949.206.9960 Voice
949.206.9983 Fax
e-mail:
sales@4emi.com
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