Appendix A November, 2000   Low-Pass 3-Pole Butterworth

Theoretical Transfer Characteristics
f/fc   Amp   Phase   Delay1 (Hz)   (dB)   (deg)   (sec)               0.10   0.000   -11.5   .320 0.20   0.000   -23.1   .325 0.30   -0.003   -34.9   .335 0.40   -0.018   -47.3   .350 0.50   -0.067   -60.3   .372               0.60   -0.198   -74.1   .398 0.70   -0.483   -88.9   .423 0.80   -1.01   -104   .436 0.90   -1.85   -120   .428 1.00   -3.01   -135   .398               1.10   -4.43   -149   .352 1.20   -6.01   -160   .303 1.30   -7.65   -170   .257 1.40   -9.31   -179   .217 1.50   -10.9   -186   .185               1.60   -12.5   -192   .158 1.70   -14.0   -198   .137 1.80   -15.4   -202   .119 1.90   -16.8   -206   .105 2.00   -18.1   -210   .093               2.50   -23.9   -223   .056 3.00   -28.6   -231   .038 3.50   -32.6   -237   .027 4.00   -36.1   -241   .021 5.00   -41.9   -247   .013               6.00   -46.7   -251   .009 7.00   -50.7   -254   .007 8.00   -54.2   -256   .005 9.00   -57.3   -257   .004 10.0   -60.0   -259   .003 Notes: 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).   Normalized Delay Actual Delay =     Actual Corner Frequency (fc) in Hz