900CT Datasheet, PDF (16/19 Pages) Frequency Devices, Inc. – Tunable Active Filter Instrument

8-Pole, 6-Zero
Appendix A
Elliptic, 2.00
Low-Pass
Theoretical Transfer Characteristics
Frequency Response
f/fc
Amp Phase Delay1
(Hz) (dB) (deg) (sec)
0.00 0.00
0.00 0.885
0.10 -0.001 -31.9 0.891
0.20 -0.015 -64.2 0.903
0.30 -0.040 -97.0 0.922
0.40 -0.042 -131 0.958
0.50 -0.001 -166
0.55 0.000 -185
0.60 -0.007 -204
0.65 -0.027 -225
0.70 -0.045 -245
1.020
1.057
1.099
1.140
1.193
0.75 -0.040 -268
0.80 -0.014 -291
0.85 -0.001 -317
0.90 -0.031 -346
0.95 -0.036 -378
1.269
1.377
1.513
1.677
1.960
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)
Delay (Normalized)
1.00 -0.046 -419 2.681
4.0
1.10 -7.910 -525 2.127
1.20 -21.06 -573 0.856
1.30 -31.96 -597 0.509
1.40 -41.51 -612 0.357
1.50 -50.35 -623
1.60 -58.90 -632
0.271
0.216
2.0
1.70 -67.54 -639 0.177
1.75 -72.04 -642 0.162
1.80 -76.79 -645 0.149
0.8
1.85 -81.93 -647
1.90 -87.78 -650
1.95 -95.04 -652
2.00 -106.6 -654
2.20 -106.0 -481
0.138
0.128
0.119
0.111
0.087
0.0
0.1 ^{0.15 2}
3 4 5 6 7 8 9_1.0 1.5
Normalized Time (1/f sec)
2.40 -121.3 -307
2.60 -106.5 -311
2.80 -105.0 -315
3.00 -106.4 -318
3.50 -123.6 -325
4.00 -111.5 -149
5.00 -105.4 -156
6.00 -105.1 -160
7.00 -106.0 -163
0.070
0.058
0.049
0.042
0.030
0.022
0.014
0.010
0.007
Step Response
1.2
1.0
0.8
0.6
8.00 -107.3 -165 0.005
0.4
9.00 -108.6 -167
10.0 -110.0 -168
0.004
0.003
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
0
1
2
3
4
5
by the actual corner frequency (fc).
Normalized Time (1/f sec)
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
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