Design a 4th order lowpass filter using Butterworth approximation with a cut-off corner frequency of 45Hz. Table 4.1 shows the Butterworth response value. (Assume that all the capacitances are 0.3μF, you can choose your own suitable resistance value calculation) RAI ORDER 1 2 3 4 5 6 RB1 www ROLL-OFF DB/DECADE -20 -40 -60 -80 -100 - 120 CB1 CAL 2 poles POLES 1 2 2 2 2 2 1ST STAGE DF Optional 1.414 1.00 1.848 1.00 1.932 www www R₁ R₂ RA2 Figure 4.1 R₁/R₂ POLES 0.586 1 0.152 1 0.068 1 2 2 2 Table 4.1 RB2 www CA2 CB2 2 poles 2ND STAGE 1.00 0.765 1.618 1.414 DF R3/R4 1 1.235 0.382 0.586 POLES 1 2 www R3 R4 3RD STAGE DF R5/R6 0.618 1.382 0.518 1.482

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Design a 4th order lowpass filter using Butterworth approximation with a cut-off
corner frequency of 45Hz. Table 4.1 shows the Butterworth response value. (Assume
that all the capacitances are 0.3μF, you can choose your own suitable resistance value
calculation)
RAI
ORDER
1
2
3
4
5
6
RB1
www
ROLL-OFF
DB/DECADE
-20
-40
-60
-80
-100
- 120
CB1
CAL
2 poles
POLES
1
2
2
2
2
2
1ST STAGE
DF
Optional
1.414
1.00
1.848
1.00
1.932
www
R₁
R₂
RA2
Figure 4.1
R₁/R₂ POLES
0.586
1
0.152
1
0.068
1
2
2
2
Table 4.1
RB2
www
CA2
CB2
2 poles
2ND STAGE
DF R3/R4
1.00
1
0.765
1.235
1.618
0.382
1.414 0.586
POLES
1
2
www
www-li
R3
R4
3RD STAGE
DF R5/R6
0.618 1.382
0.518
1.482
Transcribed Image Text:Design a 4th order lowpass filter using Butterworth approximation with a cut-off corner frequency of 45Hz. Table 4.1 shows the Butterworth response value. (Assume that all the capacitances are 0.3μF, you can choose your own suitable resistance value calculation) RAI ORDER 1 2 3 4 5 6 RB1 www ROLL-OFF DB/DECADE -20 -40 -60 -80 -100 - 120 CB1 CAL 2 poles POLES 1 2 2 2 2 2 1ST STAGE DF Optional 1.414 1.00 1.848 1.00 1.932 www R₁ R₂ RA2 Figure 4.1 R₁/R₂ POLES 0.586 1 0.152 1 0.068 1 2 2 2 Table 4.1 RB2 www CA2 CB2 2 poles 2ND STAGE DF R3/R4 1.00 1 0.765 1.235 1.618 0.382 1.414 0.586 POLES 1 2 www www-li R3 R4 3RD STAGE DF R5/R6 0.618 1.382 0.518 1.482
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