| 摘要 |
A voltage control variable attenuator takes a structure using a feedback loop which allows a signal modulated by a modulator to be attenuated based on a comparison result from a comparator. A power amplifier outputs the signal inputted thereto from the voltage control variable attenuator without amplifying the signal when no control signal is outputted from a control section, and amplifies a power of the signal inputted thereto from the voltage control variable attenuator to output it when the control signal is outputted from the control section. In a detection circuit, a change-over switch is provided which switches a detection voltage to be detected, depending on whether or not the control signal is outputted from the control section.
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