Parallel filter

The invention discloses a parallel filter which comprises a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor and a first inductor, and one end of the first resistor, one end of the first capacitor, one end of the second capacitor and one end of the first inductor are connected. The other end of the second capacitor, the other end of the first inductor, one end of the third capacitor and one end of the second resistor are connected; the other end of the first resistor, the other end of the first capacitor, the other end of the third capacitor and the other end of the second resistor are connected; the values of the first capacitor, the second capacitor, the third capacitor and the first inductor are related to a parameter m and the values of related devices of the fixed k type filter, fc is the cut-off frequency of the filter, and f infinity is the frequency for infinitely attenuating noise signals; the filter has the advantages that the infinite frequency and impedan