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LS404M Datasheet(PDF) 7 Page - STMicroelectronics |
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LS404M Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 11 page LS404 7/11 Fixed R = R1 = R2, we have (see figure 13) Figure 13 : Filter Configuration Three parameters are needed to characterize the frequency and phase response of a 2nd order ac- tive filter: the gain (Gv), the damping factio ( ξ) or the Q factor (Q = 2 ξ)1), and the cuttoff frequency (fc). The higher order response are obtained with a se- ries of 2nd order sections. A simple RC section is introduced when an odd filter is required. The choice of ’ ξ' (or Q factor) determines the filter response (see table 1). Table 1 EXAMPLE Figure 14 : 5th Order Low-pass Filter (Butterworth) with Unity Gain configuration C1 = 1 R ---- ζ ωc ------- C 2 = 1 R ---- 1 ξωc ----------- C2 R2 R1 Vin C1 Vout Filter Response ξ Q Cuttoff Frequency fc Bessel Frequency at which Phase Shift is -90°C Butterworth Frequency at which Gv = -3dB Chebyschev Frequency at which the amplitude response passes through specified max. ripple band and enters the stop bank. 3 2 ------- 1 3 ------- 2 2 ------- 1 2 ------- 2 2 ------- 1 2 ------- C2 R2 R1 C1 Ri Ci C4 R4 R3 C3 |
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