IMAGE TRAP FILTER

摘要

PROBLEM TO BE SOLVED: To provide a trap filter for image signal removal, miniaturized and facilitated in monolithic integration to be used for a radio receiver. SOLUTION: An inductor 10 and a capacitor 12 are serially connected and resonated in an image frequency to provide a low impedance in respect of an image frequency and an impedance element 14 is provided parallel with the serial circuit and resonated to provide a high impedance in respect of a radio frequency.