AN Dataforth Corporation Page  of  DID YOU KNOW  Low Pass Filter Rise Time vs Bandwidth Preamble A Few Little Reminders  AN Dataforth Corporation Page  of  R R R C C C Vin Vou Illustrative Example Fi
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AN Dataforth Corporation Page of DID YOU KNOW Low Pass Filter Rise Time vs Bandwidth Preamble A Few Little Reminders AN Dataforth Corporation Page of R R R C C C Vin Vou Illustrative Example Fi

can be factored Important Note 1 Important Note 2 brPage 3br AN121 Dataforth Corporation Page 3 of 7 ID Value ID Value Note Time and Frequency Response Analysis Important Table 1 Circuit Values brPage 4br AN121 Dataforth Corporation Page 4 of 7 Figu

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AN Dataforth Corporation Page of DID YOU KNOW Low Pass Filter Rise Time vs Bandwidth Preamble A Few Little Reminders AN Dataforth Corporation Page of R R R C C C Vin Vou Illustrative Example Fi




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Presentation on theme: "AN Dataforth Corporation Page of DID YOU KNOW Low Pass Filter Rise Time vs Bandwidth Preamble A Few Little Reminders AN Dataforth Corporation Page of R R R C C C Vin Vou Illustrative Example Fi"— Presentation transcript:


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AN121 Dataforth Corporation Page 1 of 7 DID YOU KNOW ? Low Pass Filter Rise Time vs Bandwidth Preamble A Few Little Reminders
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AN121 Dataforth Corporation Page 2 of 7 R5 R4 R3 C3 C5 C4 Vin Vou Illustrative Example Figure 1 Low Pass 3-Pole Filter Sallen-Key Active-Passive Combination Note: For interested circuit gurus, recall that in LP filters like this, theory shows that the b1 coefficients are always the sum of open-circuit-time constants (OCT) as seen by each capacitor. can be factored. Important Note 1: Important Note 2:
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AN121 Dataforth

Corporation Page 3 of 7 ID Value ID Value Note: Time and Frequency Response Analysis Important: Table 1 Circuit Values
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AN121 Dataforth Corporation Page 4 of 7 Figure 2 (a, b, c, d) Normalized Response Plots for the LP Filter Topology in Figure 1 Plots Show Effects of Different Poles with Component Values from Table 1 Bandwidth and Rise Time Data Shown Below in Table 2 Table 2 Data for Figure 2 Gain Pole, w1 Pole, w2 Pole, w3 BW, 3dB Hz 10%-90% Rise Time 18421 8899 1569 241 1.45ms 2 18264 5070 2778 356 0.97ms 3.5 18131 1907 j*3248 1907 +j*3248 744 0.45ms 4 18101 1227 -j*3564

1227 +j*3564 848 0.37ms 2.b 2.a 2.c 2.d
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AN121 Dataforth Corporation Page 5 of 7 Figure 3 Enlarged Copies of Figure 2.b and 2.d Important Observations about Low Pass Filter Responses without N(s) Zeros Note: ( 2.b 2.d
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AN121 Dataforth Corporation Page 6 of 7 Dataforth Signal Conditioning Module (SCM) Low Pass Filter Figure 4 Dataforth Generic 7-Pole Low Pass Filter BW = 4Hz and Rise Time = 0.090 sec. ___ No Frequency Peaking Maximum Flatness 140 dB/decade Minimum Rise Time, Fast Settlin with Minimum Rin in
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AN121 Dataforth Corporation Page 7 of 7

Rise Time vs Bandwidth [Rise Time = 0.35/ (BW, Hz)] Figure 5 10%-90% Rise time vs Bandwidth in Hz 3-Pole LP Filter Figure 1, Component values Table 1 Actual vs Ideal with % Error [Rise Time = 0.35/ (BW, Hz)] Final Note Dataforth References Rise Time vs Bandwidth 4.0E-04 6.0E-04 8.0E-04 1.0E-03 1.2E-03 1.4E-03 1.6E-03 200 225 250 275 300 325 350 375 400 425 450 475 500 525 550 575 600 625 BW, Hz 10-90 Rise Time, sec 0.0 0.5 1.0 1.5 2.0 2.5 % Error