[email protected] wrote: > > Hello all, > > I am looking for a method to determine the minimum distance which I can > route 1 GHz traces from other devices (including metal pin row headers) > without compromising the EMC performance (characteristic impedance) of the > traces, while preventing any common-mode coupling to the other devices.
Is this an analog or digital signal? A rule of thumb that I've *seen* used is no closer than 1/4 inch. Parasitic end effects that are difficult to model come into play. This was used in an ECL based 10GHz digital design. Formal *characteristic impedence* of the traces will not be comprised theoretically since it is based on a ratio of inductance/inch and capacitance/inch parameters of the trace. Ideally, trace length should not make a difference of characteristic impedence as crazy as that sounds. Common-mode coupling will be a challange. I hope your not using FR-4 for board material? ************************************************************ ------------------------------------------------------------ The comments and opinions stated herein are mine alone, and do not reflect those of my employer. ------------------------------------------------------------ ************************************************************
