图1. 一阶巴特沃斯低通滤波器电路图
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图1是一由运放741或351组成的一阶有源巴特沃斯低通滤波器电路图。截止频率fc = 1/{2π(RC),增益Gp = 1 + (RF/R1).The circuit shown in Figure 1 is a first-order Butterworth low-pass filter. A low-pass filter is a circuit that blocks signals with frequencies greater than a cut-off frequency fc. The circuit in
Figure 1 uses an op-amp configured as a non-inverting amplifier, with an RC circuit at the non-inverting input to do the filtering of the high-frequency signals. The cut-off frequency fc of this circuit is determined by R and C, i.e., fc = 1/{2π(RC)}.
负压脉动式清肺仪The pass-band gain Gp of this filter is given by: Gp = 1 + (RF/R1). Thus, if the frequency f of the input signal is lower than fc, Vo ≈ Gp x Vin. If f = fc, Vo ≈ 0.707 Gp x Vin. If f > fc, Vo < Gp x Vin.
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颗粒冷却塔图2. 二阶巴特沃斯低通滤波器电路图
水中氨氮的测定方法图2是一由运放741或351组成的二阶有源巴特沃斯低通滤波器电路图。截止频率fc = 1/{2π x sqrt(R2R3C2C3)},增益Vo/Vin = (1+RF/R1).
As the frequency of the input signal goes higher than fc, the gain of the first-order Butterworth low-pass filter in Figure 1 decreases at a rate of -20 dB/decade. If one desires a better low-pass frequency response than this, the second-order Butterworth low-pass filter in Figure 2 can be used. This circuit exhibits a -40 dB/decade roll-off at f>fc, wherein fc = 1/{2π x sqrt(R2R
3C2C3)}. Also, for this circuit, magnitude of Vo/Vin = (1+RF/R1)/(sqrt(1+(f/fc)4)).
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