900CT Datasheet, PDF (18/19 Pages) Frequency Devices, Inc. – Tunable Active Filter Instrument

Appendix A
Theoretical Transfer Characteristics
f/fc
Amp Phase Delay1
(Hz) (dB) (deg) (sec)
0.10 -89.3 164 0.440
0.20 -82.1 148 0.459
0.30 -90.6 131 0.495
0.40 -82.4 292 0.559
0.50 -87.8 450 0.671
0.55 -90.0 437 0.761
0.60 -60.2 603 0.890
0.70 -32.4 563 1.37
0.80 -13.1 498 2.35
0.85 -6.28 451 2.77
0.90 -2.21
0.95 -0.51
1.00 -0.03
1.10 -0.01
1.20 -0.05
401 2.66
358 2.15
324 1.64
277 1.04
225 0.757
1.30 -0.03
1.40 0.01
1.50 0.03
1.60 0.03
1.70 0.03
221 0.596
201 0.486
185 0.409
172 0.347
160 0.299
1.80 0.02
1.90 0.01
2.00 0.01
2.50 -0.02
3.00 -0.02
150
0.260
141
0.229
133
0.203
105
0.123
86.9 0.083
4.00 -0.02
5.00 -0.01
6.00 -0.01
7.00 -0.01
8.00 -0.01
64.7 0.046
51.6 0.029
42.9 0.020
36.8 0.015
32.1 0.011
9.00 -0.01
10.0 0.00
28.6 0.009
25.7 0.007
8-Pole, 6-Zero
Elliptic, 1.77
High-Pass
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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