90PF Slot Card
Dual Channel Programmable
Introduction Filter/Amplifier Card
Description
Each 90PF slot card provides two channels of
precision, low noise and distortion (-100 dB typical)
programmable filters with up to 60 dB of pre and 20
dB of post adjustable gain.
Filter modules are programmable from 0.1 Hz to
300 kHz utilizing 4, 11-bit tuning ranges. When
assembled with a high-pass filter in channel one
(1) and a low-pass filter in channel two (2), 90PF
slot cards can be configured on the fly to operate
as a low-pass, high-pass, band-pass, or band-
reject (notch) filter. Customers can select any
combination of two available filter modules per slot
card to meet their application specific signal
conditioning needs.
Front panel mounted BNC's provide easy access
for connection of signal input and output. Other
features include differential or single-ended input,
AC or DC-coupled input, single ended output, LED
clipping indicators and fine adjustment of DC
offset. Operating the 90PF in filter BYPASS mode
allows the design engineer to use each channel as
a precision instrumentation grade programmable
amplifier. Available 90PF Low Pass Filters
Part # dB # Poles Filter Type
Features L8B -100 8 Butterworth
· 0.1 Hz to 300 kHz Tuning Range L8L -100 8 Bessel
· Selectable single-ended or differential input L8E -88 8, 6-zero Elliptic, 1.77
· Gain/phase matched channels L8EY -100 8, 6-zero Elliptic, 2.00
· LED clipping indicators L8D80 -80 8, 6-zero Constant Delay
· Memory storage for up to 9 set-ups/slot card L8D10 -100 8, 6-zero Constant Delay
· <-100 dB signal-to-noise ratio to 100 kHz BW
· Programmable gain, 60 dB pre and 20 dB post Available 90PF High Pass Filters
Part # dB # Poles Filter Type
Applications H8B -100 8 Butterworth
· Anti-Aliasing H8E -88 8, 6-zero Elliptic, 1.77
· Sound Measurement H8EY -100 8, 6-zero Elliptic, 2.00
· Noise Testing
· Audio Communications
· Medical Research
· Industrial Process Control
· Seismic Analysis
· Vibration Analysis
1
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
90PF Slot Card
Dual Channel Programmable
Introduction Filter/Amplifier Card
6 10
Signal Channel Signal
2
Pre-Gain Filter M odule Post-Gain
Input 1
19
One Output 1
BNC
SNG/DIF
BNC 14
AC/DC
BYPASS
ACTIVE
BDREJECT1
6 10
20
Signal Channel Signal
2
Pre-Gain Filter M odule Post-Gain
Input 2 Two Output 2
BNC
BYPASS BNC
SNG/DIF
14 ACTIVE
AC/DC
BDREJECT2
CH2_NO_CASCADE
CPLD DAC CPLD DAC CPLD DAC DAC CPLD
SPI BUS
EEPROM for FILTER CODE
AT25256 P89C660 25C080
EEPROM for PARAM ETERS
32-PIN CONNECTOR
TO BACKPLANE
Figure 1 Signal Path
2
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
90PF Slot Card
Low Pass
Specifications Filter Options
Aaaa
Product Model 90PF - L8B 90PF - L8L 90PF - L8E 90PF - L8EY
Transfer Function 8-Pole 8-Pole 8-Pole, 6-Zero 8-Pole, 6-Zero
Butterworth Bessel elliptic 1.77 elliptic 2.00
Tuning Range 0.1 Hz to 300 kHz 0.1 Hz to 300 kHz 0.1 Hz to 300 kHz 0.1 Hz to 300 kHz
Theoretical Transfer Appendix A Appendix A Appendix A Appendix A
Characteristics Page 9 Page 4 Page 24 Page 25
Passband Ripple 0.0 dB 0.0 dB ±0.035 dB ±0.05 dB
(theoretical)
Pass Band Gain 0 ± 0.2 dB 0 ± 0.2 dB 0 ± 0.2 dB 0 ± 0.2 dB
(non-inverting)
Stop Band Attenuation Rate Attenuation Rate Attenuation Attenuation
48 dB/octave 48 dB/octave 80 dB 100 dB
Corner Frequency
Accuracy fc ±2% max. fc ± 2% max. fr ± 2% max. fr ± 2% max.
Amplitude -3 dB -3 dB -0.035 dB -0.05 dB
Phase -360° -182° -323° -419°
Phase Match1 0 - fc ±2º max. 0 - fc ±2º max. 0 0.8fr ±2º max. 0 0.8fr ±3º max.
±1º typ. ±1º typ. ±1º typ. ±1.5º typ.
0.8fr - fr ±4º max. 0.8fr - fr ±4º max.
±2º typ. ±2º typ.
Filter Attenuation
(theoretical) 0.12 dB 0.80 fc 1.91 dB 0.80 fc 0.035 dB 1.00 fr 0.5 dB 1.00 fr
3.01 dB 1.00 fc 3.01 dB 1.00 fc 3.01 dB 1.13 fr 3.01 dB 1.06 fr
60.0 dB 2.37 fc 60.0 dB 4.52 fc 60.0 dB 1.67 fr 80.0 dB 1.83 fr
80.0 dB 3.16 fc 80.0 dB 6.07 fc 80.0 dB 1.77 fr 100.0 dB 2.00 fr
Amplitude Accuracy1 0 - 0.8 fc 0 - fc 0 - 0.8 fr 0 - 0.8 fr
0.1 to 100 kHz ±0.2 dB max. ±0.2 dB max. ±0.2 dB max. ±0.2 dB max.
(theoretical)
±0.1 dB typ. ±0.1 dB typ. ±0.1 dB typ. ±0.1 dB typ.
0.8 fc - fc 0.8 fr - fr 0.8 fr - fr
±0.3 dB max. ±0.4 dB max. ±0.5 dB max.
±0.15 dB typ. ±0.2 dB typ. ±0.25 dB typ.
Total Harmonic
Distortion @ 1 kHz <-100dB typ.@3Vrms <-100dB typ.@3Vrms <-100dB typ.@3Vrms <-100dB typ.@3Vrms
Broad Band Noise 200µVrms typ. 200µVrms typ. 200µVrms typ. 200µVrms typ.
(5 Hz to 2MHz)
Narrow Band Noise <100nV/ Hz typ. <100nV/ Hz typ. <100nV/ Hz typ. <100nV/ Hz typ.
Note 1: Channel to channel match for the same transfer function set to the same frequency and operating configuration.
3
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
90PF Slot Card
Low Pass
Specifications Filter Options
Product Model 90PF - L8D80 90PF - L8D10
Transfer Function 8-Pole, 6-Zero 8-Pole, 6-Zero
constant delay constant delay
Tuning Range 0.1 Hz to 300 kHz 0.1 Hz to 300 kHz
Theoretical Transfer Appendix A Appendix A
Characteristics Page 21 Page 22
Passband Ripple 0.10 dB 0.15 dB
(theoretical)
Pass Band Gain 0 ± 0.2 dB 0 ± 0.2 dB
(non-inverting)
Stop Band Attenuation Rate Attenuation Rate
80 dB 100 dB
Corner Frequency
Accuracy fc ±2% max. fc ±2% max.
Amplitude -3 dB -3 dB
Phase -306° -311°
Phase Match1 0 0.8fc ±2º max. 0 0.8fc ±2º max.
±1º typ. ±1º typ.
0.8fc fc ±4º max. 0.8fc fc ±4º max.
±2º typ. ±2º typ.
Filter Attenuation
(theoretical) 3.01 dB 1.00 fc 3.01 dB 1.00 fc
60.0 dB 3.08 fc 80.0 dB 4.45 fc
80.0 dB 3.57 fc 100 dB 5.20 fc
Amplitude Accuracy1 0 - 0.8 fc 0 - 0.8 fc
0.1 to 100 kHz ±0.2 dB max. ±0.2 dB max.
(theoretical)
±0.1 dB typ. ±0.1 dB typ.
0.8 fc - fc 0.8 fc - fc
±0.4 dB max. ±0.5 dB max.
±0.2 dB typ. ±0.25 dB typ.
Total Harmonic
Distortion @ 1 kHz <-100dB typ.@3Vrms <-100dB typ.@3Vrms
Broad Band Noise 200µVrms typ. 200µVrms typ.
(5 Hz to 2MHz)
Narrow Band Noise <100nV/ Hz typ. <100nV/ Hz typ.
Note 1: Channel to channel match for the same transfer function set to the same frequency and operating configuration.
4
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
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90PF Slot Card
High Pass
Specifications Filter Options
Product Model 90PF - H8B 90PF - H8E 90PF - H8EY
Transfer Function 8-Pole 8-Pole, 6-Zero 8-Pole, 6-Zero
Butterworth elliptic 1.77 elliptic 2.00
Tuning Range 0.1 Hz to 300 kHz 0.1 Hz to 300 kHz 0.1 Hz to 300 kHz
Theoretical Transfer Appendix A Appendix A Appendix A
Characteristics Page 29 Page 37 Page 38
Passband Ripple 0.0 dB ±0.035 dB ±0.05 dB
(theoretical)
Pass Band Gain 0 ± 0.2dB to 100kHz 0 ± 0.2dB to 100kHz 0 ± 0.2dB to 100kHz
(non-inverting) 0 ± 0.5dB to 400kHz 0 ± 0.5dB to 400kHz 0 ± 0.5dB to 400kHz
Power Bandwidth 500 kHz 500 kHz 500 kHz
Small Signal
Bandwidth (-6 dB) 1 MHz (-6 dB) 1 MHz (-6 dB) 1 MHz
Stop Band Attenuation Rate Attenuation Attenuation
48 dB/octave 80 dB 100 dB
Corner Frequency
Accuracy fc ± 2% max. fr ± 2% max. fr ± 2% max.
Amplitude -3 dB -0.035 dB -0.05 dB
Phase -360° -323.5° -419°
Phase Match1 fc to 100 kHz ±3º max. fr 1.25 fr ±4º max. fr 1.25 fr ±4º max.
±1.5º typ. ±2º typ. ±2º typ.
1.25fr -100 kHz ±2º max. 1.25fr -100 kHz ±3º max.
±1º typ. ±1.5º typ.
Filter Attenuation
(theoretical) -83 dB 0.30 fc -80.0 dB 0.56 fr 100 dB 0.05 fr
-48 dB 0.50 fc -60.0 dB 0.60 fr -80.0 dB 0.55 fr
-3.01 dB 1.00 fc -0.03 dB 1.00 fr -60.0 dB 0.94 fr
-0.01 dB 1.50 fc 0.00 dB 2.00 fr -0.03 dB 1.00 fr
0.00 dB 2.00 fr
Amplitude Accuracy1 fc 1.25 fc fr 1.25 fr fr 1.25 fr
0.1 Hz to 100 kHz ±0.3 dB max. ±0.4 dB max. ±0.5 dB max.
(theoretical)
±0.15 dB typ. ±0.2 dB typ. ±0.25 dB typ.
1.25 fc 400 kHz 1.25 fr 400 kHz 1.25 fr 400 kHz
±0.2 dB max. ±0.2 dB max. ±0.2 dB max.
±0.1 dB typ. ±0.1 dB typ ±0.1 dB typ
Total Harmonic
Distortion @ 1 kHz <-100dB typ. @ 3Vrms <-100dB typ. @ 3Vrms <-100dB typ. @ 3Vrms
Broad Band Noise 400µVrms typ. 400µVrms typ. 400µVrms typ.
(5 Hz 2 MHz)
Narrow Band Noise <100nV/ Hz typ. <100nV/ Hz typ. <100nV/ Hz typ.
Note 1: Channel to channel match for the same transfer function set to the same frequency and operating configuration.
5
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
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90PF Slot Card
Bypass Mode Dual Channel Programmable
Specifications @ 25ºC Filter/Amplifier Card
Input Characteristics Amplifier Characteristics
Input Impedance: Distortion @ 1 kHz <-100 dB typ. @ 3.0 Vrms
Differential 2 M shunted by 47pF Noise Density 14 nV/ Hz
Single Ended 1 M shunted by 47pF
Coupling AC or DC Pre Filter Gain (No Filter)
Maximum Input Signal ±10V pk @0 dB Gain Settings 0 to 60 dB in 5 dB steps
±0.1 dB tolerance
Input Voltage: Signal Bandwidth -6.0 dB @ 1.0 MHz@ +60 dB
Linear Differential 20V p-p (Gain Set at 0 dB) Amplitude Match ±0.1 dB @ DC
Max. Safe Differential Any Continuous value Gain Accuracy@ DC ±0.1 dB
between ±40V
Max Safe Common Mode Any Continuous value
between ±40V
Bias Current 1 nA typ., 2 nA max. Pre Filter Gain (No Filter)
Common Mode Rejection Gain Settings 0 to 20 dB in 1 dB steps
Ratio with 2k source >60 dB, dc to 50kHz ±0.1 dB tolerance
unbalance and 0 dB gain Signal Bandwidth -6.0 dB @ 1.0 MHz
Amplitude Match ±0.1 dB @ DC
Output Characteristics Gain Accuracy@ DC ±0.1 dB
Full Power Bandwidth dc to 1.0 MHz
Small Signal Bandwidth 1.0 MHz @ -6dB
(1V pk-pk)
Related Output 10V p-p for RL = 50
20V p-p for RL = 2k
Output Protection short circuit to Ground only
Output Impedance 50
Offset Voltage Adjustable to zero,
In 1 mV steps.
(Range ±100mV dc)
General
Cross Talk between
Channels <-100 dB @ 1 kHz
Operating Temperature 0ºC to 50ºC
Offset Temperature Coeff. 10µV/ºC RTI
Humidity 0 to 95%, non-condensing
Slot Card Dimensions 100 x 220 mm (3U)
Weight 0.60 Lbs., (0.3 Kg.)
Ordering Information
Select Filter Option
Channel 2
90PF-H8B/L8L
Select Filter Option
Channel 1
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 that applies 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.
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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
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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
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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
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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
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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, 1.77
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