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LS204 Scheda tecnica(PDF) 9 Page - STMicroelectronics |
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LS204 Scheda tecnica(HTML) 9 Page - STMicroelectronics |
9 / 16 page LS204 Application information for active low-pass filters 9/16 Figure 13. Filter configuration Three parameters are needed to characterize the frequency and phase response of a 2nd order active filter: ● the gain (Gv), ● the damping factor ( ξ ) or the Q factor (Q = 2 ξ )1), ● the cut-off frequency (Fc). The higher order response is obtained with a series 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 6). Table 6. Filter response to ξ or Q factor Filter response ξ Q Cut-off frequency (Fc) Bessel Frequency at which phase shift is -90°C Butterworth Frequency at which Gv = -3 dB Chebyschev Frequency at which the amplitude response passes through specified max. ripple band and enters the stop bank. C2 R2 R1 Vin C1 Vout 3 2 ------- 1 3 ------- 2 2 ------- 1 2 ------- 2 2 ------- 1 2 ------- |
Codice articolo simile - LS204_08 |
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Descrizione simile - LS204_08 |
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