900CT Datasheet, PDF (17/19 Pages) Frequency Devices, Inc. – Tunable Active Filter Instrument

Appendix A
Theoretical Transfer Characteristics
f/fc
Amp Phase Delay1
(Hz) (dB) (deg) (sec)
0.10 -160
691
0.20 -112
661
0.30 -83.7 631
0.40 -63.7 600
0.50 -48.2 568
0.819
0.828
0.843
0.867
0.903
0.60 -35.5 535
.956
0.70 -24.8 499
1.04
0.80 -15.6 459
1.19
0.85 -11.6 437
1.29
0.90 -8.06 413
1.40
0.95 -5.15 386
1.00 -3.01 360
1.20 -0.229 275
1.40 -0.020 226
1.60 -0.002 194
1.48
1.46
0.873
0.540
0.380
1.80 0.00 170
2.00 0.00 152
2.50 0.00 120
3.00 0.00 99.2
4.00 0.00 74.0
0.287
0.226
0.139
0.094
0.052
5.00 0.00 59.0
6.00 0.00 49.0
7.00 0.00 42.1
8.00 0.00 36.8
9.00 0.00 32.7
10.0 0.00 29.4
0.033
0.023
0.017
0.013
0.010
0.008
High-Pass
8-Pole
Butterworth
Frequency Response
0
-20
-40
-60
-80
-100
0.1
2 3 4 5 6 78 _1.0 2 3 4 5 6 7 _10.0
Normalized Frequency(f/fc)
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).
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
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