MULTI-BAND OUTPUT IMPEDANCE MATCHING CIRCUIT FORMED BY PASSIVE DEVICES, AMPLIFIER HAVING MULTI-BAND INPUT IMPEDANCE MATCHING CIRCUIT FORMED BY PASSIVE DEVICES AND AMPLIFIER HAVING MULTI-BAND INPUT-OUTPUT IMPEDANCE MATCHING CIRCUIT FORMED BY PASSIVE DEVICES

摘要

A multi band output impedance matching circuit composed of a passive element, an amplifier having a multi band input impedance matching circuit composed of the passive element, and the amplifier having a multi band input and output impedance matching circuit composed of the passive element are provided to suppress current consumption by adopting the passive element. A first inductor(112) and a second inductor(114) are connected between a wireless signal input terminal and a driving power terminal to supply a predetermined driving power in series. A first capacitor(111) is connected between a coupling terminal of the first and second inductors and the wireless signal output terminal in series. An input impedance matching circuit(110) matches the impedance with the wireless signal output terminal and sets up a first output frequency band by resonating according to the capacitance of the first capacitor. The input impedance matching circuit sets up a second output frequency band higher than the first output frequency band by resonating according to a parallel combination of the capacitance of the first capacitor and the combined inductance of the first and second inductors.