Harlan,
     
     The first enhancement that changed the printed wiring board (PWB) from 
     a passive interconnect to an active component within the printed 
     wiring assembly (PWA) was the introduction of matched impedance 
     (controlled/differential/broadside) traces on various signal layers of 
     a PWB.  
     
     Embedding components within the structure of a PWB--to open up trace 
     routing channels (reduce layer count), reduce path length (increase 
     signal speed), reduce via hole count and free up external layer 
     component mounting space--is gaining increased acceptance also.  
     Typical "embedded" components are decoupling capacitance cores, 
     resistors on both internal and external layers, and 
     inductor/transformer coils (planar magnetics) built with up to 6 oz. 
     (0.0084" thick) foils.  
     
     The specifics of how this is done varies among PWB fabricators.  
     Please contact me outside of the TechNet (commercial sensitivity) and 
     I will gladly share with you what HADCO Corporation has to offer.
     
     Dave Wolf/Field Engineer
     Voice:    612/893-1466
     E-Mail:   [log in to unmask]

______________________________ Reply Separator _________________________________
Subject: FAB:  Embedded Components
Author:  [log in to unmask] at SMTPLINK-HADCO
Date:    5/17/96 12:38 PM

     I think I've seen this topic before on TechNet but I 
     can't find it in my archives.  
     
     We are considering Embedded Components or Printed 
     Components(I'm not sure of the proper name) on a new 
     project.  
     
     Is there anyone (experts) that knows of a company doing 
     this either at the PWB fabrication level or at the 
     final CCA level?  
     
     Thanks in advance - Harlan