Abstract: Detection accuracy is improved with a reduced size. A radio-frequency module includes an antenna terminal, a signal input terminal, a signal output terminal, a mounting substrate, a chip inductor, and a directional coupler. The mounting substrate has a first major surface and a second major surface opposite to each other. The chip inductor is mounted on the first major surface of the mounting substrate. The chip inductor is provided in at least one of a transmitting path between the antenna terminal and the signal input terminal and a receiving path between the antenna terminal and the signal output terminal. The directional coupler is mounted on the second major surface of the mounting substrate, and at least part of the directional coupler is provided in the transmitting path.

Abstract: A radio-frequency circuit includes a power amplifier circuit, a first switch, a duplexer, a second switch, a capacitor element, and a controller. The first switch includes a first common terminal and first selection terminals. An output signal of the power amplifier circuit is applied to the first common terminal. The duplexer is a filter connected at one terminal to the first selection terminal. The second switch includes a second common terminal and plural second selection terminals. The plural second selection terminals includes the second selection terminal connected to the other terminal of the duplexer. The capacitor element is built in the first switch. The controller controls the gain of the power amplifier circuit in accordance with a monitor signal obtained via the capacitor element so as to regulate the maximum output level of the power amplifier circuit.

Abstract: A radio-frequency circuit includes a power amplifier circuit, a first switch, a duplexer, a second switch, a capacitor element, and a controller. The first switch includes a first common terminal and first selection terminals. An output signal of the power amplifier circuit is applied to the first common terminal. The duplexer is a filter connected at one terminal to the first selection terminal. The second switch includes a second common terminal and plural second selection terminals. The plural second selection terminals includes the second selection terminal connected to the other terminal of the duplexer. The capacitor element is built in the first switch. The controller controls the gain of the power amplifier circuit in accordance with a monitor signal obtained via the capacitor element so as to regulate the maximum output level of the power amplifier circuit.