Patent ID: 9705474
Date: 2017-07-11
CPC Classifications: H03F,H03H

Claim:
1. A complex band pass filter comprising: a first active filter circuit to which a first input signal is to be supplied; a second active filter circuit to which a second input signal is to be supplied, the second input signal having a substantially 90 degree phase difference from the first input signal; a first feedback circuit that includes a first element having a first impedance and feeds back an output signal of the first active filter circuit to an input side of the second active filter circuit; a second feedback circuit that includes a second element having a second impedance different from the first impedance and feeds back an output signal of the second active filter circuit to an input side of the first active filter circuit; and an output circuit that outputs an output signal according to a signal from the first active filter circuit and to a signal from the second active filter circuit.