POWER AMPLIFIER CIRCUIT

摘要

PURPOSE: A power amplification circuit is provided to improve cross isolation between a low frequency combining device and a high frequency combining device by constituting an inductance or an LC resonance circuit. CONSTITUTION: A power amplification circuit(100) comprises a power amplifying unit(110), a joint unit(120), an isolating unit(130), and a shielding unit(140). The power amplifying unit amplifies the level of an input signal according to a fixed gain. A differential signal, which is amplified in the power amplifying unit, is transmitted to the high frequency power combining device(121) or the low frequency power combining device(122) of the joint unit according to a frequency bandwidth. The isolating unit includes a blocking unit(131) which blocks a frequency interference between a second power line and a first power source line. The shield unit is able to shield a harmonic component in the even number degree of an output signal.