900CT Datasheet, PDF (14/19 Pages) Frequency Devices, Inc. – Tunable Active Filter Instrument

8-Pole, 6-Zero
Appendix A
Constant Delay
Low-Pass (100 dB)
Theoretical Transfer Characteristics
f/fc
Amp Phase Delay1
(Hz) (dB) (deg) (sec)
0.00 0.00
0.00 .865
0.10 0.015 -31.1 .865
0.20 0.051 -62.3 .865
0.30 0.085 -93.4 .865
0.40 0.085 -125
.865
0.50
0.010 -156
.865
0.60 -0.182 -187
.865
0.70 -0.532 -218
.865
0.80 -1.09
-249
.864
0.85 -1.45
-265
.863
0.90 -1.89
-280
.861
0.95 -2.41
-296
.857
1.00 -3.01
-311
.851
1.10 -4.50
-341
.828
1.20 -6.38
-370
.785
1.40 -11.2
-422
.650
1.60 -16.8
-464
.504
1.80 -22.5
-496
.389
2.00 -28.0
-520
.306
2.25 -34.5
-544
.235
2.50 -40.5
-563
.186
2.75 -46.1
-578
.151
3.00 -51.4
-591
.125
3.50 -61.5
-610
.090
4.00 -71.2
-624
.068
4.50 -81.3
-635
.054
5.00 -93.4
-643
.043
5.50 -142
-651
.036
6.00 -105
-476
.030
6.20 -105
-478
.028
6.50 -106
-481
.025
7.00 -110
-486
.022
8.00 -122
-312
.017
9.00 -109
-318
.013
10.0 -106
-322
.011
Frequency Response
0
-20
-40
-60
-80
-100
-120
0.1 ^{2 3 4 5 678} 1.0 ^{2 3 4 5 67} 10.0
Normalized Frequency(f/fc)
Delay (Normalized)
1.0
0.5
0.0
0.1
0.15
2
3 4 5 6 7 8 9 _1.0 1.5
Normalized Time (1/f sec)
Step Response
1.2
1.0
0.8
12.0 -105
-328
.007
0.6
14.0 -106
-333
.005
16.0 -107
-336
.004
0.4
18.0 -108
-339
.003
20.0 -109
-341
.003
0.2
1.Normalized Group Delay:
-0.0
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).
-0.2
0
1
2
3
4
5
Normalized Time (1/f sec)
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
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