The present invention relates to a circuit for removing a citizen band which is an unnecessary signal from a tuner that does not use a citizen band. The present invention is a citizen band trap circuit in a device that receives an RF signal of airwaves as an input and tunes it. The conductance (C 4 ) and the conductance (C 4 ) for receiving an RF signal to remove DC components and passing only AC components 4 ) includes a series resonant circuit in which a conductance and an inductance for trapping a resonant frequency f 0 band according to a predetermined equation among RF signals passed through are connected in series. Therefore, the present invention can trap the citizen band enough to satisfy the European standard, and the measurement result shows the efficiency of 5dBμV or more than the specified value (89dBμV).
展开▼
