Abstract: A multiband filter circuitry utilized in a radio-frequency (RF) system is disclosed. The multiband filter circuitry operates at a plurality of operating frequency bands. The multiband filter circuitry comprises at least a switchable-filtering series. Each of the at least a switchable-filtering series comprises a first terminal coupled between the antenna and the RF processing unit; a second terminal coupled to a ground; and a plurality of switchable-filtering units connected in series, each comprising a filtering unit; and a switching unit, connected to the filtering unit in parallel.

Abstract: An electronic device includes a circuit board. The circuit board includes a power amplifier footprint configured for mounting a first power amplifier or a second power amplifier thereon. The power amplifier footprint includes a first part and a second part. The first part includes multiple I/O pads. When the first power amplifier is mounted on the circuit board, the I/O pads in the first part are coupled to the first power amplifier. The second part includes multiple I/O pads. When the second power amplifier is mounted on the circuit board, both the I/O pads in the first part and the I/O pads in the second part are coupled to the second power amplifier.

Abstract: A radio frequency (RF) module capable of self-calibration is provided. According to an embodiment, the RF module includes an RF signal processor, a plurality of RF signal paths, an antenna switch module (ASM), and a power detector. The RF signal paths are connected between the RF signal processor and the ASM. The ASM has an antenna port and selectively connects the RF signal processor to the antenna port through one of the RF signal paths. The power detector is operative to detect power of an RF transmission signal that exits the antenna port of the ASM and enters an antenna when the ASM connects an RF transmission path of the RF signal paths to the antenna port of the ASM.

Abstract: A radio frequency (RF) module capable of self-calibration is provided. According to an embodiment, the RF module includes an RF signal processor, a plurality of RF signal paths, an antenna switch module (ASM), and a power detector. The RF signal paths are connected between the RF signal processor and the ASM. The ASM has an antenna port and selectively connects the RF signal processor to the antenna port through one of the RF signal paths. The power detector is operative to detect power of an RF transmission signal that exits the antenna port of the ASM and enters an antenna when the ASM connects an RF transmission path of the RF signal paths to the antenna port of the ASM.

Abstract: An electronic device includes a circuit board. The circuit board includes a power amplifier footprint configured for mounting a first power amplifier or a second power amplifier thereon. The power amplifier footprint includes a first part and a second part. The first part includes multiple I/O pads. When the first power amplifier is mounted on the circuit board, the I/O pads in the first part are coupled to the first power amplifier. The second part includes multiple I/O pads. When the second power amplifier is mounted on the circuit board, both the I/O pads in the first part and the I/O pads in the second part are coupled to the second power amplifier.