双工器的指标求助

   我在仿一个双工器的时候遇到两个指标不明白，请各位高手帮一下忙 2ezk<R5q+  
直标是：Passband Amplitude Distortion :1.Linear amplitude distortion   <=0.2dB across any 24MH                                                      2.Parabolic amplitude distortion  <=0.1dB across any 24MHz _xWX/1DY  
                 Group Delay Distortion: 1.Linear amplitude distortion   <=3ns across any 24MHz et`1#_o  
                                                            2.Parabolic amplitude distortion  <=3ns across any 24MHz  !n`9V^`  
是什么意思啊？ /1y\EEc  
                                  &n .. ltWEA  
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