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Subject:
DES: "Spec"ing Controlled Impedance
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Date:
Tue, 08 Oct 96 10:28:55 CST
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     RF engineers measure the effectiveness of a controlled impedance line 
     most often by sweeping a circuit out to a certain frequency with a 
     network analyzer.  PWB houses measure controlled impedance lines with 
     TDRs.
     
     What is the best way to specify controlled impedance line testing on a 
     drawing to satisfy both parties?  Just spec the rise time for the TDR? 
     Is there a better way?
     
     Regards,
     
     John R. Kretsch, P.E.
     Sr. Engineer, Design Assurance
     ADC Broadband Communications

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