D68 & DP68 Series
1.0 Hz to 100 kHz 32 Pin DIP
Fixed Frequency 8-Pole Filters
Description
The D68 and DP68 Series of small 8-pole fixed-
frequency, precision active filters provide high
performance linear active filtering in a compact 32-
pin DIP package, with a broad range of corner
frequencies and a choice of transfer functions.
Individual D68 filters can serve in low-pass or high-
pass applications (DP68, low-pass only) or be
combined to create custom band-pass or band-
reject filters. These fully self-contained units
require no external components or adjustments.
Each model comes factory tuned to a user-specified
corner frequency between 1 Hz and 100 kHz (DP68,
1 Hz to 5 kHz) and operate with low total harmonic
distortion over a wide dynamic input voltage range
from non-critical +/-5V to +/-18V power supplies.
Features/Benefits:
· Low harmonic distortion and wide signal-to-noise
ratio to 16 bit resolution. Available Low-Pass Models: . . . . . . . . . . .Page
D68L8B & DP68L8B
· Compact 1.8"L x 0.8"W x 0.3"H minimizes board 8-pole Butterworth . . . . . . . . . . . . . . . . .2
space requirements. D68L8E & DP68L8E
· Plug-in ready-to-use, reducing engineering design 8-pole, 6 zero elliptic, 1.77 (-80dB) . . . .2
and manufacturing cycle time. D68L8EX & DP68L8EX
· Factory tuned, no external clocks or adjustments 8-pole, 6 zero elliptic, 1.56 (-80dB) . . . .2
needed D68L8EY & DP68L8EY
· Broad range of transfer characteristics and corner 8-pole, 6 zero elliptic, 2.00 (-100dB) . . .2
frequencies to meet a wide range of applications. D68L8L & DP68L8L
8-pole Bessel. . . . . . . . . . . . . . . . . . . . .3
Applications D68L8D60 & DP68L8D60
8-pole constant delay (-60 dB) . . . . . . . .3
· Anti-alias filtering
D68L8D & DP68L8D
· Data acquisition systems 8-pole constant delay (-80 dB) . . . . . . . .3
· Communication systems and electronics D68L8D10 & DP68L8D10
8-pole constant delay (-100 dB) . . . . . . .3
· Medical electronics equipment and research
Available High-Pass Models: . . . . . . . . . . . . . . . .
· Aerospace, navigation and sonar applications D68H8B 8-pole Butterworth . . . . . . . . . . . . . . . . .4
· Sound and vibration testing D68H8E 8-pole, 6 zero elliptic, 1.77 (-80dB) . . . .4
D68H8EX 8-pole, 6 zero elliptic, 1.56 (-80dB) . . . .4
· Acoustic and vibration analysis and control
D68H8EY 8-pole, 6 zero elliptic, 2.00 (-100dB) . . . .4
· Noise elimination General Specifications: ................
· Signal reconstruction Pin-out/package data & ordering information . . . . . .5
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
D68 & DP68 Series
8-Pole
Fixed Frequency Low-Pass Filters
Model D68L8B & DP68L8B D68L8E & DP68L8E D68L8EX & DP68L8EX D68L8EY & DP68L8EY
Product Specifications
Transfer Function 8-Pole, Butterworth 8-Pole, 6 zero, 8-Pole, 6 zero, 8-Pole, 6 zero,
Elliptic Elliptic Elliptic
Size 1.8" x 0.8" x 0.3" 1.8" x 0.8" x 0.3" 1.8" x 0.8" x 0.3" 1.8" x 0.8" x 0.3"
Range fc, fr
D68 1 Hz to 100 kHz 1 Hz to 100 kHz 1 Hz to 100 kHz 1 Hz to 100 kHz
DP68 1 Hz to 5 kHz 1 Hz to 5 kHz 1 Hz to 5 kHz 1 Hz to 5 kHz
Theoretical Transfer Appendix A Appendix A Appendix A Appendix A
Characteristics Page 9 Page 24 Page 23 Page 25
Passband Ripple 0.0 dB ± 0.035 dB -0.05 dB -0.05 dB
(theoretical)
DC Voltage Gain 0 ± 0.1 dB max. 0 ± 0.1 dB max. 0 ± 0.1 dB max. 0 ± 0.1 dB max.
(non-inverting) 0 ± 0.05 dB typ. 0 ± 0.05 dB typ. 0 ± 0.05 dB typ. 0 ± 0.05 dB typ.
Stopband
Attenuation Rate 48 dB/octave 80 dB min. 80 dB min. 100 dB min.
Cutoff Frequency fc ± 1% max. fr ± 1% max. fr ± 1% max. fr ± 2% max.
Stability ± 0.01% /°C ± 0.01% /°C ± 0.01% /°C ± 0.01% /°C
Amplitude -3 dB -0.035 dB -0.05 dB -0.05 dB
Phase -360° -323.5° -414° -419°
Filter Attenuation 0.12 dB 0.80 fc 0.035 dB 1.00 fr 0.05 dB 1.00 fr 0.05 dB 1.00 fr
(theoretical) 3.01 dB 1.00 fc 3.01 dB 1.13 fr 3.01 dB 1.05 fr 3.01 dB 1.06 fr
60.0 dB 2.37 fc 60.0 dB 1.67 fr 60.0 dB 1.45 fr 80.0 dB 1.83 fr
80.0 dB 3.16 fc 80.0 dB 1.77 fr 80.0 dB 1.56 fr 100.0 dB 2.00 fr
Phase Match1 0 - 0.8 fc ± 2° max. 0 - 0.8 fr ± 2° max. 0 - 0.8 fr ± 3° max. 0 - 0.8 fr ± 3° max.
± 1° typ. ± 1° typ. ± 1.5° typ. ± 1.5° typ.
0.8 fc - 1.0 fc ± 3° max. 0.8 fr - 1.0 fr ± 4° max. 0.8 fr - 1.0 fr ± 4° max. 0.8 fr - 1.0 fr ± 4° max.
± 1.5° typ. ± 2° typ. ± 2° typ. ± 2° typ.
Amplitude Accuracy 0 - 0.8 fc ± 0.2 dB max. 0 - 0.8 fr ± 0.2 dB max. 0 - 0.8 fr ± 0.2 dB max. 0 - 0.8 fr ± 0.2 dB max.
(theoretical) ± 0.1 dB typ. ± 0.1 dB typ. ± 0.1 dB typ. ± 0.1 dB typ.
0.8 fc - 1.0 fc ± 0.3 dB max. 0.8 fr - 1.0 fr ± 0.3 dB max. 0.8 fr - 1.0 fr ± 0.5 dB max. 0.8 fr - 1.0 fr ± 0.5 dB max.
± 0.15 dB typ. ±0 .15 dB typ. ± 0.25 dB typ. ± 0.25 dB typ.
Total Harmonic
Distortion @ 1 kHz
D68 <-100 dB typ. <-88 dB typ. <-88 dB typ. <-88 dB typ.
DP68 <-80 dB typ. <-80 dB typ. <-80 dB typ. <-80 dB typ.
Wide Band Noise 200 mVrms typ. 200 mVrms typ. 250 mVrms typ. 250 mVrms typ.
(5 Hz - 2 MHz)
Narrow Band Noise 50 mVrms typ. 50 mVrms typ. 75 mVrms typ. 75 mVrms typ.
(20 Hz - 100 kHz)
Filter Mounting
Assembly FMA-01A FMA-01A FMA-01A FMA-01A
1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.
2
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
D68 & DP68 Series
8-Pole
Fixed Frequency Low-Pass Filters
Model D68L8L & DP68L8L D68L8D60 & DP68L8D60 D68L8D & DP68L8D D68L8D10 & DP68L8D10
Product Specifications
Transfer Function 8-Pole, Bessel 8-Pole, 6 zero, 8-Pole, 6 zero, 8-Pole, 6 zero,
Constant Delay Constant Delay Constant Delay
Size 1.8" x 0.8" x 0.3" 1.8" x 0.8" x 0.3" 1.8" x 0.8" x 0.3" 1.8" x 0.8" x 0.3"
Range fc
D68 1 Hz to 100 kHz 1 Hz to 100 kHz 1 Hz to 100 kHz 1 Hz to 100 kHz
DP68 1 Hz to 5 kHz 1 Hz to 5 kHz 1 Hz to 5 kHz 1 Hz to 5 kHz
Theoretical Transfer Appendix A Appendix A Appendix A Appendix A
Characteristics Page 4 Page 20 Page 21 Page 22
Passband Ripple 0.0 dB 0.15 dB 0.15 dB 0.15 dB
(theoretical)
DC Voltage Gain 0 ± 0.1 dB max. 0 ± 0.1 dB max. 0 ± 0.1 dB max. 0 ± 0.1 dB max.
(non-inverting) 0 ± 0.05 dB typ. 0 ± 0.05 dB typ. 0 ± 0.05 dB typ. 0 ± 0.05 dB typ.
Stopband
Attenuation Rate 48 dB/octave 60 dB min. 80 dB min. 100 dB min.
Cutoff Frequency fc ± 1% max. fc ± 1% max. fc ± 1% max. fc ± 2% max.
Stability ± 0.01% /°C ± 0.01% /°C ± 0.01% /°C ± 0.01% /°C
Amplitude -3dB -3dB -3dB -3dB
Phase -182° -306° -306° -311°
Filter Attenuation 1.91 dB 0.80 fc 3.01 dB 1.00 fc 3.01 dB 1.00 fc 3.01 dB 1.00 fc
(theoretical) 3.01 dB 1.00 fc 40.0 dB 2.28 fc 60.0 dB 3.08 fc 80.0 dB 4.45 fc
60.0 dB 4.52 fc 60.0 dB 2.64 fc 80.0 dB 3.57 fc 100.0 dB 5.20 fc
80.0 dB 6.07 fc
Phase Match1 0 - fc ± 2° max. 0 - fc ± 2° max. 0 - fc ± 2° max. 0 - fc ± 2° max.
± 1° typ. ± 1° typ. ± 1° typ. ± 1° typ.
Amplitude Accuracy 0 - fc ± 0.2 dB max. 0 - 0.8 fc ± 0.2 dB max. 0 - 0.8 fc ± 0.2 dB max. 0 - 0.8 fc ± 0.2 dB max.
(theoretical) ± 0.1 dB typ. ± 0.1 dB typ. ± 0.1 dB typ. ± 0.1 dB typ.
0.8 fc - 1.0 fc ± 0.3 dB max. 0.8 fc - 1.0 fc ± 0.3 dB max. 0.8 fc - 1.0 fc ± 0.3 dB max.
±0 .15 dB typ. ±0 .15 dB typ. ± 0.15 dB typ.
Total Harmonic
Distortion @ 1 kHz
D68 <-100 dB typ. <-100 dB typ. <-100 dB typ. <-100 dB typ.
DP68 <-80 dB typ. <-80 dB typ. <-80 dB typ. <-80 dB typ.
Wide Band Noise 200 mVrms typ. 200 mVrms typ. 200 mVrms typ. 200 mVrms typ.
(5 Hz - 2 MHz)
Narrow Band Noise 50 mVrms typ. 50 mVrms typ. 50 mVrms typ. 50 mVrms typ.
(20 Hz - 100 kHz)
Filter Mounting
Assembly FMA-01A FMA-01A FMA-01A FMA-01A
1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.
3
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
D68 & DP68 Series
8-Pole
Fixed Frequency High-Pass Filters
Model D68H8B D68H8E D68H8EX D68H8EY
Product Specifications
Transfer Function 8-Pole, Butterworth 8-Pole, 6 Zero, 8-Pole, 6 Zero, 8-Pole, 6 zero,
Elliptic Elliptic Elliptic
Size 1.8" x 0.8" x 0.3" 1.8" x 0.8" x 0.3" 1.8" x 0.8" x 0.3" 1.8" x 0.8" x 0.3"
Range fc, fr
D68 1 Hz to 100 kHz 1 Hz to 100 kHz 1 Hz to 100 kHz 1 Hz to 100 kHZ
DP68 Not Available Not Available Not Available Not Available
Theoretical Transfer Appendix A Appendix A Appendix A Appendix A
Characteristics Page 29 Page 37 Page 36 Page 38
Passband Ripple 0.0 dB ± 0.035 dB -0.05 dB -0.05 dB
(theoretical)
Voltage Gain 0 ± 0.2 dB to 100 kHz 0 ± 0.2 dB to 100 kHz 0 ± 0.2 dB to 100 kHz 0 ± 0.2 dB to 100 kHz
(non-inverting) 0 ± 0.5 dB to 120 kHz 0 ± 0.5 dB to 120 kHz 0 ± 0.5 dB to 120 kHz 0 ± 0.5 dB to 120 kHz
Stopband
Attenuation Rate 48 dB/octave 80 dB 80 dB 100 dB
Power Bandwidth 120 kHz 120 kHz 120 kHz 120 kHz
Small Signal Bandwidth (-6dB) 1 MHz (-6dB) 1 MHz (-6dB) 1 MHz (-6dB) 1 MHz
Cutoff Frequency fc ± 1% max. fr ± 1% max. fr ± 1% max. fr ± 2% max.
Stability ± 0.01% /°C ± 0.01% /°C ± 0.01% /°C ± 0.01% /°C
Amplitude -3 dB -0.035 dB` -0.05 dB -0.05 dB
Phase -360° -323.5° -414° -419°
Filter Attenuation 80.0 dB 0.31 fc 80.0 dB 0.56 fr 80.0 dB 0.64 fr 100.0 dB 0.50 fr
(theoretical) 60.0 dB 0.42 fc 60.0 dB 0.60 fr 60.0 dB 0.69 fr 80.0 dB 0.55 fr
3.01 dB 1.00 fc 3.01 dB 0.88 fr 3.01 dB 0.95 fr 3.01 dB 0.94 fr
0.00 dB 2.00 fc 0.03 dB 1.00 fr 0.05 dB 1.00 fr 0.03 dB 1.00 fr
0.00 dB 2.00 fr 0.00 dB 2.00 fr 0.00 dB 2.00 fr
Phase Match1 fc - 100 kHz ± 3° max. 0 - 1.25 fr ± 4° max. 0 - 1.25 fr ± 4° max. 0 - 1.25 fr ± 4° max.
± 1.5° typ. ± 2° typ. ± 2° typ. ± 2° typ.
1.25 fr-100 kHz ± 2° max. 1.25 fr-100 kHz ± 2° max. 1.25 fr-100 kHz ± 3° max.
± 1° typ. ± 1° typ. ± 1.5° typ.
Amplitude Accuracy 1.0 - 1.25 fc ± 0.3 dB max. 1.00 - 1.25 fr ± 0.3 dB max. 1.00 - 1.25 fr ± 0.5 dB max. 1.00 - 1.25 fr ± 0.5 dB max
(theoretical) ± 0.15 dB typ. ± 0.15 dB typ. ± 0.25 dB typ. ± 0.25 dB typ
1.25 fc-100 kHz± 0.2 dB max. 1.25 fr-100 kHz ± 0.2 dB max. 1.25 fr-100 kHz± 0.2 dB max. 1.25 fr-100 kHz ± 0.2 dB max.
± 0.1 dB typ. ±0 .1 dB typ. ±0 .1 dB typ. ±0 .1 dB typ.
Total Harmonic
Distortion @ 1 kHz
D68 <-88 dB typ. <-88 dB typ. <-88 dB typ. <-88 dB typ.
Wide Band Noise 400 mVrms 400 mVrms typ. 500 mVrms typ. 500 mVrms typ.
(5 Hz - 2 MHz)
Narrow Band Noise 100 mVrms typ. 100 mVrms typ. 150 mVrms typ. 150 mVrms typ.
(20 Hz - 100 kHz)
Filter Mounting
Assembly FMA-01A FMA-01A FMA-01A FMA-01A
1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.
4
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
D68 & DP68 Series
Specification Pin-Out and Package Data
(25°C and Vs ± 15 Vdc) Ordering Information
1
Analog Input Characteristics 0.80
Impedance 10 kW min.
Voltage Range ± 10 Vpeak Side View
All dimensions are in inches
Max. Safe Voltage ± Vs All case dimensions ± 0.01"
0.025 dia.
Analog Output Characteristics 1.80
Impedance(Closed Loop) 1 W typ.
10 W max. Front View 0.30
Linear Operating Range ± 10 V 0.15 (min)
2
Maximum Current ± 2 mA
3
Offset Voltage 2 mV typ. 0.80
20 mV max. 0.70
OUT +VS -VS OS4
Offset Temp. Coeff. 50 mV / °C
Bottom View
Power Supply (±V) GND IN
Rated Voltage ± 15 Vdc 0.10
0.00
Operating Range ± 5 to ± 18 Vdc
0.00
0.15
0.45
0.55
1.55
1.65
1.80
Maximum Safe Voltage ± 18 Vdc
Quiescent Current D68 Filter Mounting Assembly-See FMA-01A
± 25 mA typ.
± 40 mA max. Ordering Information
Quiescent Current DP68
± 7 mA typ. Filter Type Transfer Function
± 10 mA max. L - Low Pass B - Butterworth
Temperature H - High Pass L - Bessel
D - constant delay (-80 dB)
Operating - 0 to + 70 °C D60 - constant delay (-60 dB)
Storage - 25 to + 85 °C D10 - constant delay (-100 dB)
E - elliptic 1.77 (-80 dB)
EX - elliptic 1.56 (-80 dB)
DC Offset Adjustment EY - elliptic 2.00 (-100 dB)
± Vs
D68L8B-849 Hz
Do not connect
if trim is not Power Level 5
required. - 3 dB Corner Frequency
D Standard Power
20 k W
e.g., 849 Hz
OS DP Low Power 2.50 kHz
(Cermet)
Notes: 33.3 kHz
1. Input and output signal voltage referenced to supply common.
2. Output is short circuit protected to common. DO NOT CONNECT TO ±Vs.
3. Adjustable to zero.
- Vs 4. Units operate with or with out offset pin connected.
5. How to Specify Corner Frequency:
Corner frequencies are specified by attaching a three digit frequency
designator to the basic model number. Corner frequencies can range from
1.00 Hz to 100 kHz.
We hope the information given here will be helpful. The information is based on data and our best knowledge, and we consider the information to be true and accurate. Please read all statements,
recommendations or suggestions herein in conjunction with our conditions of sale which apply to all goods supplied by us. We assume no responsibility for the use of these statements,
recommendations or suggestions, nor do we intend them as a recommendation for any use which would infringe any patent or copyright. IN-00D68-02
5
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
8-Pole
Bessel
Appendix A Low-Pass
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.00 0.00 0.00 .506
Amp (dB)
0.10 -0.029 -18.2 .506 -40
0.20 -0.117 -36.4 .506
0.30 -0.264 -54.7 .506 -60
0.40 -0.470 -72.9 .506
0.50 -0.737 -91.1 .506
-80
0.60 -1.06 -109 .506
0.70 -1.45 -128 .506 -100
0.80 -1.91 -146 .506 2 3 4 5 6 78
0.85 -2.16 -155 .506 0.1 1.0 2 3 4 5 6 7 10.0
0.90 -2.42 -164 .506 Normalized Frequency(f/fc)
0.95 -2.71 -173 .506
1.00 -3.01 -182 .506
1.10 -3.67 -200 .506 Delay (Normalized)
1.20 -4.40 -219 .506
1.30 -5.20 -237 .506 1.0
1.40 -6.10 -255 .505
Delay (sec)
1.50 -7.08 -273 .504
1.60 -8.16 -291 .502
1.70 -9.36 -309 .498
1.80 -10.7 -327 .492 0.5
1.90 -12.1 -345 .482
2.00 -13.7 -362 .468
2.25 -18.1 -402 .417
2.50 -23.1 -436 .352
2.75 -28.3 -465 .291 0.0
0.15 2 3 4 5 6 7 89 1.5
0.1 1.0
3.00 -33.4 -489 .241 Normalized Time (1/f sec)
3.25 -38.3 -509 .201
3.50 -43.1 -526 .170
4.00 -51.8 -552 .126
5.00 -66.8 -587 .077 Step Response
Step Response (V/V)
6.00 -79.2 -610 .052 1.2
7.00 -89.8 -626 .038 1.0
8.00 -99.0 -638 .029
9.00 -107 -647 .023 0.8
10.0 -114 -655 .018
0.6
0.4
0.2
1.Normalized Group Delay:
-0.0
The above delay data is normalized to a corner frequency -0.2
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
4
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
Low-Pass
8-Pole
Appendix A Butterworth
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.00 0.00 0.00 .816
Amp (dB)
0.10 0.00 -29.4 .819 -40
0.20 0.00 -59.0 .828
0.30 0.00 -89.1 .843 -60
0.40 0.00 -120 .867
0.50 0.00 -152 .903
-80
0.60 -0.001 -185 .956
0.70 -0.014 -221 1.04 -100
0.80 -0.121 -261 1.19 2 3 4 5 6 78 1.0 2 3 4 5 67
0.85 -0.311 -283 1.29 0.1 10.0
0.90 -0.738 -307 1.40 Normalized Frequency(f/fc)
0.95 -1.58 -333 1.48
1.00 -3.01 -360 1.46
1.10 -7.48 -408 1.17 Delay (Normalized)
1.20 -12.9 -445 .873 2.0
1.30 -18.2 -472 .672
1.40 -23.4 -494 .540
Delay (sec)
1.50 -28.2 -511 .448
1.60 -32.7 -526 .380
1.70 -36.9 -539 .328 1.0
1.80 -40.8 -550 .287
1.90 -44.6 -560 .253
2.00 -48.2 -568 .226
2.25 -56.3 -586 .174
2.50 -63.7 -600 .139 0.0
2.75 -70.3 -611 .113 0.1 0.15 2 3 4 5 6 7 8 9 1.0 1.5
3.00 -76.3 -621 .094 Normalized Time (1/f sec)
3.25 -81.9 -629 .080
3.50 -87.1 -635 .069
4.00 -96.3 -646 .052
5.00 -112 -661 .033 Step Response
Step Response (V/V)
6.00 -125 -671 .023 1.2
7.00 -135 -678 .017
8.00 -144 -683 .013 1.0
9.00 -153 -687 .010 0.8
10.0 -160 -691 .008
0.6
0.4
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
9
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
8-Pole, 6-Zero
Constant Delay
Appendix A Low-Pass (60 dB)
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.00 0.00 0.00 .776
Amp (dB)
0.10 0.005 -28.0 .776 -40
0.20 0.012 -55.9 .776
0.30 0.005 -83.9 .776 -60
0.40 -0.042 -112 .776
0.50 -0.161 -140 .776 -80
0.60 -0.384 -168 .776
0.70 -0.745 -196 .776 -100
0.80 -1.28 -224 .776 2 3 4 5 6 78
0.85 -1.62 -238 .776 0.1 1.0 2 3 4 5 6 7 10.0
Normalized Frequency(f/fc)
0.90 -2.02 -252 .776
0.95 -2.48 -265 .775
1.00 -3.01 -279 .773
1.10 -4.29 -307 .766 Delay (Normalized)
1.20 -5.91 -334 .749
1.0
1.40 -10.3 -386 .675
1.60 -15.9 -431 .558
Delay (sec)
1.80 -22.4 -467 .443
2.00 -29.4 -495 .351
2.25 -39.0 -523 .268
0.5
2.50 -50.5 -544 .212
2.75 -78.0 -561 .171
3.00 -63.7 -395 .142
3.25 -63.5 -407 .119
3.50 -66.9 -417 .102
0.0
3.75 -74.7 -425 .088 0.1 0.15 2 3 4 5 6 7 89
1.0 1.5
4.00 -85.0 -253 .077 Normalized Time (1/f sec)
4.25 -72.0 -259 .068
4.50 -67.9 -265 .060
4.75 -65.8 -270 .054
Step Response
5.00 -64.6 -275 .048
Step Response (V/V)
5.25 -63.9 -279 .044 1.2
5.50 -63.5 -283 .040 1.0
5.75 -63.3 -286 .036
6.00 -63.2 -289 .033 0.8
6.50 -63.3 -295 .028 0.6
7.00 -63.7 -299 .024
8.00 -64.7 -307 .019 0.4
9.00 -66.0 -313 .015 0.2
10.0 -67.3 -318 .012
1.Normalized Group Delay:
-0.0
The above delay data is normalized to a corner frequency -0.2
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
20
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
8-Pole, 6-Zero
Constant Delay
Appendix A Low-Pass (80 dB)
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.00 0.00 0.00 .852
Amp (dB)
0.10 0.017 -30.7 .852 -40
0.20 0.058 -61.3 .852
0.30 0.099 -92.0 .852 -60
0.40 0.105 -123 .852
0.50 0.034 -153 .852 -80
0.60 -0.157 -184 .852
0.70 -0.510 -215 .852 -100
0.80 -1.07 -245 .851 2 3 4 5 6 78
0.85 -1.44 -261 .850 0.1 1.0 2 3 4 5 6 7 10.0
Normalized Frequency(f/fc)
0.90 -1.89 -276 .849
0.95 -2.41 -291 .846
1.00 -3.01 -306 .841
1.10 -4.50 -336 .821 Delay (Normalized)
1.20 -6.39 -365 .783
1.0
1.40 -11.3 -417 .656
1.60 -17.1 -459 .512
Delay (sec)
1.80 -23.2 -492 .396
2.00 -29.1 -517 .312
2.25 -36.3 -542 .239
0.5
2.50 -43.4 -561 .189
2.75 -50.3 -576 .153
3.00 -57.6 -589 .127
3.25 -62.5 -599 .107
3.50 -75.4 -608 .092
0.0
3.75 -98.3 -616 .079 0.1 0.15 2 3 4 5 6 7 89
1.0 1.5
4.00 -86.3 -442 .069 Normalized Time (1/f sec)
4.25 -84.1 -448 .061
4.50 -85.1 -454 .054
4.75 -87.9 -458 .049
Step Response
5.00 -92.8 -462 .044
Step Response (V/V)
5.25 -104 -466 .040 1.2
5.50 -101 -289 .036 1.0
5.75 -93.3 -293 .033
6.00 -89.9 -295 .030 0.8
6.50 -86.6 -300 .026 0.6
7.00 -85.1 -305 .022
8.00 -84.1 -312 .017 0.4
9.00 -84.3 -317 .013 0.2
10.0 -84.9 -321 .011
1.Normalized Group Delay:
-0.0
The above delay data is normalized to a corner frequency -0.2
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
21
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
8-Pole, 6-Zero
Constant Delay
Appendix A Low-Pass (100 dB)
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec) -20
0.00 0.00 0.00 .865
Amp (dB)
0.10 0.015 -31.1 .865 -40
0.20 0.051 -62.3 .865 -60
0.30 0.085 -93.4 .865
0.40 0.085 -125 .865 -80
0.50 0.010 -156 .865 -100
0.60 -0.182 -187 .865
0.70 -0.532 -218 .865 -120
0.80 -1.09 -249 .864 2 3 4 5 678 2 3 4 5 67
0.85 -1.45 -265 .863 0.1 1.0 10.0
Normalized Frequency(f/fc)
0.90 -1.89 -280 .861
0.95 -2.41 -296 .857
1.00 -3.01 -311 .851
1.10 -4.50 -341 .828 Delay (Normalized)
1.20 -6.38 -370 .785
1.0
1.40 -11.2 -422 .650
1.60 -16.8 -464 .504
Delay (sec)
1.80 -22.5 -496 .389
2.00 -28.0 -520 .306
2.25 -34.5 -544 .235
0.5
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
0.0 0.15 2 3 4 5 6 7 89
4.50 -81.3 -635 .054 0.1 1.0 1.5
5.00 -93.4 -643 .043 Normalized Time (1/f sec)
5.50 -142 -651 .036
6.00 -105 -476 .030
6.20 -105 -478 .028
Step Response
6.50 -106 -481 .025
Step Response (V/V)
7.00 -110 -486 .022 1.2
8.00 -122 -312 .017 1.0
9.00 -109 -318 .013
10.0 -106 -322 .011 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 0.2
20.0 -109 -341 .003
1.Normalized Group Delay:
-0.0
The above delay data is normalized to a corner frequency -0.2
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
22
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
8-Pole, 6-Zero
Elliptic, 1.56
Appendix A Low-Pass
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.00 0.00 0.00 0.823
Amp (dB)
0.10 -0.001 -29.7 0.829 -40
0.20 -0.013 -59.8 0.844
0.30 -0.040 -90.5 0.865
0.40 -0.049 -122 0.904 -60
0.50 -0.018 -156 0.972 -80
0.55 -0.003 -174 1.016
0.60 -0.002 -192 1.064 -100
0.65 -0.019 -212 1.116 2 3 4 5 6 78 2 3 4 5 67
0.70 -0.042 -233 1.178 0.1 1.0 10.0
0.75 -0.049 -255 1.264 Normalized Frequency(f/fc)
0.80 -0.026 -279 1.388
0.85 -0.001 -305 1.557
0.90 -0.024 -335 1.767
0.95 -0.045 -369 2.111 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
Delay (sec)
1.30 -39.45 -598 0.493
1.40 -52.87 -614 0.348
1.50 -69.11 -624 0.265 2.0
1.60 -89.09 -453 0.211
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 0.158
1.90 -89.31 -290 0.126 0.0 0.15 2 3 4 5 6 7 89
1.95 -86.44 -292 0.117 0.1 1.0 1.5
2.00 -84.96 -295 0.110 Normalized Time (1/f sec)
2.20 -84.54 -302 0.087
2.40 -88.65 -307 0.069
2.60 -99.78 -311 0.057 Step Response
2.80 -99.97 -135 0.048
Step Response (V/V)
3.00 -90.20 -139 0.041 1.2
3.50 -85.09 -145 0.029
4.00 -84.04 -150 0.022 1.0
5.00 -84.76 -156 0.014 0.8
6.00 -86.45 -160 0.009
7.00 -88.31 -163 0.007 0.6
8.00 -90.11 -165 0.005 0.4
9.00 -91.82 -167 0.004
10.0 -93.41 -168 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
23
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
8-Pole, 6-Zero
Elliptic, 1.77
Appendix A Low-Pass
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.00 0.00 0.00 0.713
Amp (dB)
0.10 -0.004 -25.7 0.716 -40
0.20 -0.014 -51.6 0.724
0.30 -0.024 -77.9 0.740
0.40 -0.020 -105 0.767 -60
0.50 0.007 -133 0.811 -80
0.55 0.022 -148 0.840
0.60 0.033 -163 0.872 -100
0.65 0.031 -179 0.908
2 3 4 5 6 78
0.70 0.014 -196 0.946 0.1 1.0 2 3 4 5 6 7 10.0
0.75 -0.015 -213 0.989 Normalized Frequency(f/fc)
0.80 -0.041 -232 1.04
0.85 -0.046 -251 1.12
0.90 -0.016 -272 1.23
0.95 -0.025 -296 1.40 Delay (Normalized)
1.00 -0.035 -323 1.65 4.0
1.10 -1.76 -392 2.14
1.20 -8.28 -467 1.86
Delay (sec)
1.30 -18.4 -522 1.19
1.40 -29.3 -558 0.753
1.50 -40.1 -578 0.517 2.0
1.60 -51.5 -594 0.381
1.70 -65.2 -606 0.296
1.75 -75.0 -611 0.265
1.80 -113.0 -616 0.239 0.8
1.85 -83.6 -440 0.217
1.90 -82.0 -444 0.198 0.0
0.15 2 3 4 5 6 7 89
1.95 -83.7 -447 0.182 0.1 1.0 1.5
2.00 -87.8 -450 0.168 Normalized Time (1/f sec)
2.20 -85.8 -280 0.126
2.40 -82.0 -289 0.099
2.60 -83.5 -295 0.081 Step Response
2.80 -88.2 -301 0.067
Step Response (V/V)
3.00 -99.9 -305 0.057 1.2
3.50 -87.2 -134 0.040
4.00 -83.1 -140 0.030 1.0
5.00 -82.1 -148 0.018 0.8
6.00 -83.1 -154 0.013
7.00 -84.6 -157 0.009 0.6
8.00 -86.2 -160 0.007 0.4
9.00 -87.8 -163 0.005
10.0 -89.3 -164 0.004 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
24
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
8-Pole, 6-Zero
Elliptic, 2.00
Appendix A Low-Pass
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec) -20
0.00 0.00 0.00 0.885
Amp (dB)
0.10 -0.001 -31.9 0.891 -40
0.20 -0.015 -64.2 0.903
0.30 -0.040 -97.0 0.922 -60
0.40 -0.042 -131 0.958 -80
0.50 -0.001 -166 1.020
0.55 0.000 -185 1.057 -100
0.60 -0.007 -204 1.099
0.65 -0.027 -225 1.140 -120
2 3 4 5 6 78
0.70 -0.045 -245 1.193 0.1 1.0 2 3 4 5 6 7 10.0
0.75 -0.040 -268 1.269 Normalized Frequency(f/fc)
0.80 -0.014 -291 1.377
0.85 -0.001 -317 1.513
0.90 -0.031 -346 1.677
0.95 -0.036 -378 1.960 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
Delay (sec)
1.30 -31.96 -597 0.509
1.40 -41.51 -612 0.357
1.50 -50.35 -623 0.271 2.0
1.60 -58.90 -632 0.216
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 0.138
1.90 -87.78 -650 0.128 0.0
0.15 2 3 4 5 6 7 89
1.95 -95.04 -652 0.119 0.1 1.0 1.5
2.00 -106.6 -654 0.111 Normalized Time (1/f sec)
2.20 -106.0 -481 0.087
2.40 -121.3 -307 0.070
2.60 -106.5 -311 0.058 Step Response
2.80 -105.0 -315 0.049
Step Response (V/V)
3.00 -106.4 -318 0.042 1.2
3.50 -123.6 -325 0.030
4.00 -111.5 -149 0.022 1.0
5.00 -105.4 -156 0.014 0.8
6.00 -105.1 -160 0.010
7.00 -106.0 -163 0.007 0.6
8.00 -107.3 -165 0.005 0.4
9.00 -108.6 -167 0.004
10.0 -110.0 -168 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
25
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
High-Pass
8-Pole
Appendix A Butterworth
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.10 -160 691 0.819
Amp (dB)
0.20 -112 661 0.828 -40
0.30 -83.7 631 0.843
0.40 -63.7 600 0.867 -60
0.50 -48.2 568 0.903
0.60 -35.5 535 .956 -80
0.70 -24.8 499 1.04
0.80 -15.6 459 1.19 -100
0.85 -11.6 437 1.29 2 3 4 5 6 78
0.90 -8.06 413 1.40 0.1 1.0 2 3 4 5 6 7 10.0
Normalized Frequency(f/fc)
0.95 -5.15 386 1.48
1.00 -3.01 360 1.46
1.20 -0.229 275 0.873
1.40 -0.020 226 0.540
1.60 -0.002 194 0.380
1.80 0.00 170 0.287
2.00 0.00 152 0.226
2.50 0.00 120 0.139
3.00 0.00 99.2 0.094
4.00 0.00 74.0 0.052
5.00 0.00 59.0 0.033
6.00 0.00 49.0 0.023
7.00 0.00 42.1 0.017
8.00 0.00 36.8 0.013
9.00 0.00 32.7 0.010
10.0 0.00 29.4 0.008
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
29
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
8-Pole, 6-Zero
Elliptic, 1.56
Appendix A High-Pass
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.10 -93.4 168 0.334
Amp (dB)
0.20 -84.8 156 0.344 -40
0.30 -86.0 143 0.363
0.40 -92.6 310 0.392 -60
0.50 -85.0 295 0.439
0.55 -114 287 0.472 -80
0.60 -84.1 458 0.515
0.70 -57.0 617 0.652 -100
0.80 -32.8 589 0.962 2 3 4 5 6 78
0.85 -22.6 569 1.325 0.1 1.0 2 3 4 5 6 7 10.0
Normalized Frequency(f/fc)
0.90 -12.3 538 2.198
0.95 -3.08 483 3.993
1.00 -0.05 414 3.062
1.10 -0.03 341 1.498
1.20 -0.01 296 1.039
1.30 -0.04 264 0.773
1.40 -0.05 239 0.612
1.50 -0.03 219 0.505
1.60 -0.01 202 0.426
1.70 0.00 188 0.364
1.80 0.00 176 0.315
1.90 -0.01 165 0.275
2.00 -0.02 156 0.243
2.50 -0.05 122 0.145
3.00 -0.05 101 0.097
4.00 -0.03 75.1 0.053
5.00 -0.01 59.8 0.034
6.00 -0.01 49.7 0.023
7.00 0.00 42.5 0.017
8.00 0.00 37.2 0.013
9.00 0.00 33.0 0.010
10.0 0.00 29.7 0.008
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
36
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
8-Pole, 6-Zero
Elliptic, 1.77
Appendix A High-Pass
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec)
-20
0.10 -89.3 164 0.440
Amp (dB)
0.20 -82.1 148 0.459 -40
0.30 -90.6 131 0.495
0.40 -82.4 292 0.559 -60
0.50 -87.8 450 0.671
0.55 -90.0 437 0.761 -80
0.60 -60.2 603 0.890
0.70 -32.4 563 1.37 -100
0.80 -13.1 498 2.35 2 3 4 5 6 78 1.0 2 3 4 5 67
0.85 -6.28 451 2.77 0.1 10.0
Normalized Frequency(f/fc)
0.90 -2.21 401 2.66
0.95 -0.51 358 2.15
1.00 -0.03 324 1.64
1.10 -0.01 277 1.04
1.20 -0.05 225 0.757
1.30 -0.03 221 0.596
1.40 0.01 201 0.486
1.50 0.03 185 0.409
1.60 0.03 172 0.347
1.70 0.03 160 0.299
1.80 0.02 150 0.260
1.90 0.01 141 0.229
2.00 0.01 133 0.203
2.50 -0.02 105 0.123
3.00 -0.02 86.9 0.083
4.00 -0.02 64.7 0.046
5.00 -0.01 51.6 0.029
6.00 -0.01 42.9 0.020
7.00 -0.01 36.8 0.015
8.00 -0.01 32.1 0.011
9.00 -0.01 28.6 0.009
10.0 0.00 25.7 0.007
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
37
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
8-Pole, 6-Zero
Elliptic, 2.00
Appendix A High-Pass
Theoretical Transfer Characteristics Frequency Response
1 0
f/fc Amp Phase Delay
(Hz) (dB) (deg) (sec) -20
0.10 -110 168 0.338
Amp (dB)
0.20 -105 156 0.348 -40
0.30 -114 323 0.367 -60
0.40 -110 309 0.397
0.50 -107 654 0.445 -80
0.55 -78.6 646 0.480 -100
0.60 -64.6 637 0.524
0.70 -44.1 615 0.669 -120
0.80 -26.7 586 1.001 2 3 4 5 6 78
0.85 -18.2 565 1.401 0.1 1.0 2 3 4 5 6 7 10.0
Normalized Frequency(f/fc)
0.90 -9.46 533 2.315
0.95 -2.16 478 3.604
1.00 -0.046 419 2.681
1.10 -0.038 352 1.416
1.20 -0.001 308 1.018
1.30 -0.032 277 0.773
1.40 -0.046 252 0.618
1.50 -0.034 231 0.514
1.60 -0.016 214 0.436
1.70 -0.004 200 0.376
1.80 0.000 187 0.328
1.90 -0.003 176 0.288
2.00 -0.010 166 0.255
2.50 -0.042 131 0.153
3.00 -0.045 108 0.103
4.00 -0.028 80.6 0.057
5.00 -0.015 64.2 0.036
6.00 -0.008 53.4 0.025
7.00 -0.005 45.7 0.018
8.00 -0.003 40.0 0.014
9.00 -0.002 35.5 0.011
10.0 -0.001 31.9 0.009
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
38
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de