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Low-Pass
4-Pole, 0.5 dB Ripple
Appendix A
Chebychev
15
25 Locust St., Haverhill, Massachusetts 01830
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∑Web Address: http://www.freqdev.com ∑Fax on Demand: 978/521-5178
Normalized Frequency(f/fc)
Normalized Time (1/f sec)
Normalized Time (1/f sec)
Frequency Response
Delay (Normalized)
Step Response
0.1
1.0
10.0
2
3 4 5 6 78
2
3 4 5 6 7 8
-100
-80
-60
-40
-20
0
0.1
1.0
2
3
4
5 6 7 8 9
0.0
1.0
2.0
1.5
0.15
0
1
2
3
4
5
-0.0
0.2
0.4
0.6
0.8
1.0
1.2
(sec)
Theoretical Transfer Characteristics
1
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.85
0.90
0.95
1.00
1.10
1.20
1.30
1.40
1.50
1.60
1.70
1.80
1.90
2.00
2.25
2.50
2.75
3.00
3.25
3.50
4.00
5.00
6.00
7.00
8.00
9.00
10.0
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).
Actual Delay =
Normalized Delay
Actual Corner Frequency (fc) in Hz
f/fc
(Hz)
Amp
(dB)
Phase
(deg)
Delay
-74.0
-79.4
-84.1
-88.2
-91.9
-49.3
-52.2
-54.9
-59.7
-67.6
-32.1
-34.1
-38.6
-42.6
-46.1
-350
-351
-352
-353
-354
-339
-340
-342
-344
-347
-324
-326
-301
-334
-336
.005
.004
.003
.002
.002
.021
.018
.015
.011
.007
.065
.057
.042
.033
.026
-19.3
-22.4
-25.1
-27.6
-29.9
-1.12
-3.01
-7.61
-12.0
-15.9
-305
-311
-315
-318
-321
0.025
0.072
0.432
0.482
0.062
-226
-245
-272
-288
-298
.173
.134
.108
.089
.075
1.13
.946
.559
.345
.235
0.00
0.087
0.295
0.474
0.463
0.248
-119
-141
-168
-185
-205
0.00
-17.3
-35.7
-55.7
-76.9
-98.2
.578
.647
.881
1.06
1.18
.476
.492
.533
.577
.596
.583
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