Hi all, I need a little help here. After doing RF microstrip designs for the past 5 years I need now to control impedance. We have in the past been able to tweek the design to accommodate for fab tolerances, this luxury is now gone. I am working on a critical circuit that will use 0603 components and 11 printed inductors. What I need to know is: 1.) What tests should I have performed by the vendor? 2.) What tests can my in-coming QA guys do? 3.) What differences should there be in my Fab notes? 4.) If I call out 50ohm impedance should I accept a cert. of conformity or have additional tests run (outside lab)? 5.) Anything else I need to worry about? Thanks for your time and answers FNK Frank N Kimmey C.I.D. EM Designer C & K Systems, Inc. 916-353-5366 [log in to unmask] ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################