[SI-LIST] Common Mode Return Loss Measurements


A couple seemingly simple questions:

1)      What is the usually accepted method for measuring
        common mode return loss  (CMRL) ? (VNA with a balun, 
        single ended VNA and math, differential TDR, ????).
        Would a CMRL measurement be the same as a differential
        S11 measurement?
        
2)      Any practical differences between "common mode return loss"
        and "even mode return loss"? (doesn't common mode imply
        equal amplitudes and same phase while even mode only implies 
        same phase ?)
        
-Ray Anderson
Sun Microsystems

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