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AN3984 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN3984
Description  The purpose of this document is to provide a tool to calculate
PDF  46 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3984 Datasheet(HTML) 9 Page - STMicroelectronics

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AN3984
Second-order filter design
Doc ID 022240 Rev 1
9/46
For a second-order LPF, the coefficients given in APWorkbench can be calculated as
follows:
Equation 15
4.1.2
High-pass filter
The numerator coefficient for a second-order HPF can be calculated as follows:
Equation 16
For a second-order HPF, the coefficients given in APWorkbench can be calculated as
follows:
Equation 17
DE
W
b
t
Coefficien
DE
W
Q
K
t a
Coefficien
DE
W
a
t
Coefficien
DE
W
t b
Coefficien
DE
W
b
t
Coefficien
⋅
=
+
−
−
=
−
⋅
−
=
=
=
2
1
2
1
1
1
2
2
0
2
1
2
1
DE
b
DE
W
b
DE
b
1
2
1
2
1
0
=
⋅
−
=
=
DE
b
t
Coefficien
DE
W
Q
K
t a
Coefficien
DE
W
a
t
Coefficien
DE
t b
Coefficien
DE
b
t
Coefficien
1
2
1
2
1
1
1
2
1
1
2
0
2
1
2
1
⋅
=
+
−
−
=
−
⋅
−
=
=
−
=



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