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

Appendix A
Theoretical Transfer Characteristics
f/fc
Amp Phase Delay1
(Hz) (dB) (deg) (sec)
0.10 -110
0.20 -105
0.30 -114
0.40 -110
0.50 -107
168 0.338
156
0.348
323
0.367
309
0.397
654
0.445
0.55 -78.6 646
0.60 -64.6 637
0.70 -44.1 615
0.80 -26.7 586
0.85 -18.2 565
0.480
0.524
0.669
1.001
1.401
0.90 -9.46 533
0.95 -2.16 478
1.00 -0.046 419
1.10 -0.038 352
1.20 -0.001 308
2.315
3.604
2.681
1.416
1.018
1.30 -0.032 277
1.40 -0.046 252
1.50 -0.034 231
1.60 -0.016 214
1.70 -0.004 200
0.773
0.618
0.514
0.436
0.376
1.80 0.000 187
1.90 -0.003 176
2.00 -0.010 166
2.50 -0.042 131
3.00 -0.045 108
0.328
0.288
0.255
0.153
0.103
4.00 -0.028 80.6
5.00 -0.015 64.2
6.00 -0.008 53.4
7.00 -0.005 45.7
8.00 -0.003 40.0
0.057
0.036
0.025
0.018
0.014
9.00 -0.002 35.5
10.0 -0.001 31.9
0.011
0.009
8-Pole, 6-Zero
Elliptic, 2.00
High-Pass
Frequency Response
0
-20
-40
-60
-80
-100
-120
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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