Appendix A
August 1999

 

High-Pass
4-Pole
Butterworth

Theoretical Transfer Characteristics
f/fc Amp Phase Delay1
(Hz) (dB) (deg) (sec)
       
0.10 -80.0 345 .418
0.20 -55.9 330 .423
0.30 -41.8 314 .433
0.40 -31.8 299 .449
0.50 -24.1 282 .474
       
0.60 -17.8 264 .511
0.70 -12.6 245 .558
0.80 -8.43 224 .604
0.85 -6.69 213 .619
0.90 -5.22 202.0 .622
       
0.95 -3.99 191 .612
1.00 -3.01 180 .588
1.20 -0.908 143 .427
1.40 -0.285 118 .289
1.60 -0.100 100 .204
       
1.80 -0.039 87.6 .152
2.00 -0.017 78.0 .119
2.50 -0.003 61.4 .072
3.00 -0.001 50.7 .049
4.00 0.00 37.8 .027
       
5.00 0.00 30.1 .017
6.00 0.00 25.1 .012
7.00 0.00 21.4 .009
8.00 0.00 18.8 .007
9.00 0.00 16.7 .005
10.0 0.00 15.0 .004
 

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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