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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN3984 데이터시트(PDF) 13 Page - STMicroelectronics |
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AN3984 데이터시트(HTML) 13 Page - STMicroelectronics |
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13 / 46 page  AN3984 Second-order filter design Doc ID 022240 Rev 1 13/46 4.3.2 High-shelf filter The coefficients for an HSF can be calculated as follows: Equation 28 The coefficient to load in APWorkbench to program a HSF can be computed by applying the formulas shown in Equation 11. 4.4 Notch filter The first step is to define the constant α(a): Equation 29 The coefficients for a notch filter can be calculated as follows: Equation 30 The coefficients to load in APWorkbench can be calculated using Equation 11. () ( ) () ( ) () ( ) () ( ) () () () () () ( ) () β ϑ ϑ β ϑ β ϑ ϑ β ϑ − ⋅ − + + ⋅ = ⋅ + − − ⋅ ⋅ − = + ⋅ − + + ⋅ = − ⋅ − − + = ⋅ + − − ⋅ = + ⋅ − − + = c c c c c c Gain Gain Gain b Gain Gain Gain b Gain Gain Gain b Gain Gain a Gain Gain a Gain Gain a cos 1 1 cos 1 1 2 cos 1 1 cos 1 1 cos 1 1 2 cos 1 1 2 1 0 2 1 0 a. ϑc is defined in Equation 12 () Q c ⋅ = 2 sin ϑ α 1 cos 2 1 1 cos 2 1 2 1 0 2 1 0 = ⋅ − = = − = ⋅ − = + = b b b a a a c ϑ α ϑ α |
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