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# Circuit of a Filter with 4 Characteristics Simultaneously

2017-02-23 20:45

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As shown in the figure is a filter circuit with four characteristics at the same time, that is band-pass (BPF), low pass (LPF), high pass (HPF) and elimination (BEF). This circuit is composed of 4 op-amps .The center frequency f0 is decided by RF and CF,as in the formula f0 = 1/2π RFCF.The value of Q in the circuit is decided by R5 / R2 ,and the gain is decided by R2 / R1. R5 = 10 k Ω, therefore when Q = 1,the output for BPF, LPF and HPF is 0 dB. When input is sine wave, output of BEF is 0, and other filters output the same voltage.

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