90PF Datasheet, PDF (12/18 Pages) Frequency Devices, Inc. – Dual Channel Programmable Filter/Amplifier Card

8-Pole, 6-Zero
Appendix A
Elliptic, 1.56
Low-Pass
Theoretical Transfer Characteristics
Frequency Response
f/fc
Amp Phase Delay1
0
(Hz) (dB) (deg) (sec)
0.00 0.00
0.00 0.823
-20
0.10 -0.001 -29.7 0.829
0.20 -0.013 -59.8 0.844
-40
0.30 -0.040 -90.5 0.865
0.40 -0.049 -122 0.904
-60
0.50 -0.018 -156
0.55 -0.003 -174
0.60 -0.002 -192
0.65 -0.019 -212
0.70 -0.042 -233
0.75 -0.049 -255
0.80 -0.026 -279
0.85 -0.001 -305
0.90 -0.024 -335
0.95 -0.045 -369
0.972
1.016
1.064
1.116
1.178
1.264
1.388
1.557
1.767
2.111
-80
-100
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 -0.050 -414 3.062
4.0
1.10 -10.48 -531 2.043
1.20 -25.96 -576 0.814
1.30 -39.45 -598 0.493
1.40 -52.87 -614 0.348
1.50 -69.11 -624
1.60 -89.09 -453
0.265
0.211
2.0
1.70 -85.32 -459 0.174
1.75 -89.95 -463 0.156
1.80 -103.5 -465 0.147
0.8
1.85 -95.94 -288
1.90 -89.31 -290
1.95 -86.44 -292
2.00 -84.96 -295
2.20 -84.54 -302
0.158
0.126
0.117
0.110
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 -88.65 -307
2.60 -99.78 -311
2.80 -99.97 -135
3.00 -90.20 -139
3.50 -85.09 -145
4.00 -84.04 -150
5.00 -84.76 -156
6.00 -86.45 -160
7.00 -88.31 -163
0.069
0.057
0.048
0.041
0.029
0.022
0.014
0.009
0.007
Step Response
1.2
1.0
0.8
0.6
8.00 -90.11 -165 0.005
0.4
9.00 -91.82 -167
10.0 -93.41 -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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