发明授权
US08134409B2 Radio frequency power amplifier 失效
射频功率放大器

Radio frequency power amplifier
摘要:
A radio frequency power amplifier includes an input terminal to which a radio frequency signal is applied; a first hetero-bipolar transistor (HBT), which amplifies the radio frequency signal; a second HBT, which amplifies the radio frequency signal; a matching circuit connected to an output node of the second HBT; a switch connected to an output node of the matching circuit; and an output matching circuit connected to an output node of the first HBT. The output node of the switch is connected to the output node of the first HBT via the output matching circuit, and an impedance looking into an output side of the radio frequency power amplifier from the output node of the switch is higher than an impedance looking into the output side of the radio frequency power amplifier from the output node of the first HBT.
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