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LS204CD Scheda tecnica(PDF) 8 Page - STMicroelectronics |
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LS204CD Scheda tecnica(HTML) 8 Page - STMicroelectronics |
8 / 16 page Application information for active low-pass filters LS204 8/16 Increased ripple in the passband allows increased attenuation above the cut-off frequency. The cut-off frequency is defined as the frequency at which the amplitude response passes through the specified maximum ripple band and enters the stop band. Other characteristics: ● Greater selectivity ● Very non-linear phase response ● High overshoot response to step inputs Table 5 shows the typical overshoot and setting time response of the low pass filters to a step input. 4.4 Design of 2nd order active low pass filter (Sallen and Key configuration unity gain op-amp) For fixed R = R1 = R2, we have (see Figure 13): Table 5. Overshoot and setting time response of low pass filters to step input Number of poles Peak overshoot Settling time (% of final value) % Overshoot ±1% ±0.1% ±0.01% Butterworth 2 4 6 8 4 11 14 14 1.1Fc sec. 1.7/ Fc 2.4/ Fc 3.1/ Fc 1.7Fc sec. 2.8/ Fc 3.9S/ Fc 5.1/ Fc 1.9Fc sec. 3.8/ Fc 5.0S/ Fc 7.1/ Fc Bessel 2 4 6 8 0.4 0.8 0.6 0.1 0.8/ Fc 1.0/ Fc 1.3/ Fc 1.6/ Fc 1.4/ Fc 1.8/ Fc 2.1/ Fc 2.3/ Fc 1.7/ Fc 2.4/ Fc 2.7/ Fc 3.2/ Fc Chebyschev (ripple ±0.25dB) 2 4 6 8 11 18 21 23 1.1/ Fc 3.0/ Fc 5.9/ Fc 8.4/ Fc 1.6/ Fc 5.4/ Fc 10.4/ Fc 16.4/ Fc - - - - Chebyschev (ripple ±1dB) 2 4 6 8 21 28 32 34 1.6/ Fc 4.8/ Fc 8.2/ Fc 11.6/ Fc 2.7/ Fc 8.4/ Fc 16.3/ Fc 24.8/ Fc - - - C1 = 1 R ---- ζ ωc ------ C2 = 1 R ---- 1 ξ ωc ----------- |
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