Rick, Provided that you are not feeding high currents out of your control port, it may be worth trying surface mount, multi-layer ferrite beads in series with each of the signals. Several manufacturers make them in a range of sizes and attenuation profiles. You should be able to obtain a series impedance of over 500 ohms at 300 MHz, with up to 100mA load current, in a 0805 package size. Regards, Geoff
--------Original Message----------------- From: [email protected] <[email protected]> To: [email protected] <[email protected]> List-Post: [email protected] Date: 16 March 1999 22:59 Subject: Looking for a filter >I have a low frequency control port that has a high frequency (300 MHz) >common mode harmonic noise on all three lines. This is on an existing card >with a limited amount of real-estate available. To compound the problems I >am driving a unique, off-the-shelf, device with no provisions for proper >shielding. As such, I am looking for a filtered 3 pin mini-din connector, or >a filter assembly that would lend itself to surface mounting. > >Any suggestions? > >Thanks > >Rick Busche *Geoff Lister email: [email protected] *Motion Media Technology Ltd., Horton Hall, Horton, Bristol, BS37 6QN, UK. *POTS : +44-(0)1454-313444 or +44-(0)1454-338561 (direct) *ISDN : +44-(0)1454-338555 or +44-(0)1454-338554 (direct) *FAX : +44-(0)1454-313678 Home : +44-(0)1275-854025 *WWW : http://www.motionmedia.co.uk/ --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
