Appendix A
August 1999

 

Low-Pass 6-Pole Butterworth

Theoretical Transfer Characteristics
f/fc Amp Phase Delay1
(Hz) (dB) (deg) (sec)
       
0.00 0.00 0.00 .615
0.10 0.000 -22.2 .617
0.20 0.000 -44.5 .624
0.30 0.000 -67.2 .637
0.40 0.000 -90.4 .656
0.50 -0.001 -115 .685
       
0.60 -0.009 -140 .731
0.70 -0.060 -167 .803
0.80 -0.289 -198 .911
0.85 -0.578 -215 .970
0.90 -1.080 -233 1.02
       
0.95 -1.88 -252 1.03
1.00 -3.01 -270 1.00
1.10 -6.17 -304 .845
1.20 -9.96 -331 .660
1.30 -13.9 -352 .518
       
1.40 -17.6 -368 .417
1.50 -21.2 -382 .345
1.60 -24.5 -393 .291
1.70 -27.7 -403 .251
1.80 -30.6 -412 .219
       
1.90 -33.5 -419 .193
2.00 -36.1 -425 .171
2.25 -42.3 -439 .132
2.50 -47.8 -450 .105
2.75 -52.7 -458 .086
       
3.00 -57.3 -465 .071
3.25 -61.4 -471 .060
3.50 -65.3 -476 .052
4.00 -72.2 -484 .039
5.00 -83.9 -496 .025
       
6.00 -93.4 -503 .017
7.00 -101 -508 .012
8.00 -108 -512 .0097
9.00 -115 -515 .0076
10.0 -120 -518 .0062
 

Notes:

  1. Normalized Group Delay:
    The above delay data is normalized to a corner frequency of 1.0Hz.
    The actual delay is the normalized delay divided by the actual corner frequency (fc).

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