EQUALIZER

PROBLEM TO BE SOLVED: To widen the bandwidth of an equalizer. SOLUTION: An equalizer comprises resistors 8 and 10 of a T-tipe resistor attenuator 2, which are connected in series between an input terminal 4 supplied RF signals in a wide frequency band and an output terminal 6, and a resistor 12, which is connected between an interconnection point of the resistors 8 and 10 and a reference potential point. A serial resonant circuit 14 is connected in shunt with the resistors 8 and 10, the resonance frequency is set to an upper side frequency in the wide frequency band. The resistor 12 and a parallel resonant circuit 20 are connected in series, and the resonant frequency is set to a lower side frequency in the wide frequency band. Capacitors 26 and 28 are connected in shunt with the resistors 8 and 10. COPYRIGHT: (C)2003,JPO