A multi-band power amplifier module includes at least one transmission input terminal, at least one power amplifier circuit that receives a first transmission signal and a second transmission signal through the at least one transmission input terminal, a first filter circuit that allows the first transmission signal to pass therethrough, a second filter circuit that allows the second transmission signal to pass therethrough, at least one transmission output terminal through which the first and second transmission signals output from the first and second filter circuits are output, a transmission output switch that outputs each of the first and second transmission signals output from the at least one power amplifier circuit to the first filter circuit or the second filter circuit, and a first tuning circuit that adjusts impedance matching between the at least one power amplifier circuit and the at least one transmission output terminal.

An electronic device and method thereof of are provided to prevent burnout due to overcurrent. An electronic device includes a power amplifier configured to amplify a transmission signal; a battery configured to provide a bias voltage to the at least one power amplifier; and an overcurrent protection circuit configured to prevent overcurrent from flowing through the power amplifier. The overcurrent protection circuit includes a configurer configured to configure a reference current value, based on the power amplifier; a measurer configured to measure a bias current value due to the bias voltage; a comparator configured to compare the measured bias current value with the reference current value; and a controller configured to recognize overcurrent flowing through the power amplifier and control provision of the bias voltage, based on a result of the comparison.

A multi-band power amplifier module includes at least one transmission input terminal, at least one power amplifier circuit that receives a first transmission signal and a second transmission signal through the at least one transmission input terminal, a first filter circuit that allows the first transmission signal to pass therethrough, a second filter circuit that allows the second transmission signal to pass therethrough, at least one transmission output terminal through which the first and second transmission signals output from the first and second filter circuits are output, a transmission output switch that outputs each of the first and second transmission signals output from the at least one power amplifier circuit to the first filter circuit or the second filter circuit, and a first tuning circuit that adjusts impedance matching between the at least one power amplifier circuit and the at least one transmission output terminal.

A transmission apparatus is provided with: a plurality of amplification units that amplify RF signals arranged in at least 2 bands; a first control unit that selects amplification units that perform an amplification operation, from among the plurality of amplification units, in accordance with total power of RF signals to be transmitted; a second control unit which, in accordance with a power ratio of the RF signals to be transmitted in respective bands, changes the power ratio of the RF signals in the respective bands while keeping constant the total power of the RF signals received at each of the selected amplification units; and a combining unit that combines the RF signals outputted by the selected amplification units.

To provide a monitoring system capable of monitoring, without stopping operations for a long period of time, a change of the characteristics of an apparatus to be subjected to characteristic measurement, to which high frequency signals are inputted. [Solution] A signal to be monitored and a reference signal are inputted to an input unit 11 , and the input unit inputs one of the inputted signals to an apparatus 15 to be subjected to characteristic measurement. On the basis of an output signal of the apparatus 15 and the reference signal in the cases where the reference signal is inputted to the apparatus, an input/output characteristic calculation unit 12 calculates the input/output characteristics of the apparatus 15 . On the basis of calculation results obtained from the input/output characteristic calculation unit 12, a correction result generating unit 13 generates a correction result signal that indicates the results obtained by correcting an output signal of the apparatus 15 in the cases where the signal to be monitored is inputted to the apparatus. On the basis of the correction result signal generated by the correction result generating unit 13 , a failure determining unit 14 determines whether the apparatus has a failure.

In accordance with an embodiment, a circuit includes a low noise amplifier transistor disposed on a first integrated circuit, a single pole multi throw (SPMT) switch disposed on a second integrated circuit, and a bypass switch coupled between a control node of the low noise amplifier transistor and an output node of the low noise amplifier transistor. The SPMT switch couples a plurality of module input terminals to a control node of the low noise amplifier transistor, and the bypass switch including a first switch coupled between the control node of the low noise amplifier transistor and an intermediate node, a second switch coupled between the intermediate node and the output node of the low noise amplifier transistor, and a third switch coupled between the intermediate node and a first reference node. The first integrated circuit and the second integrated circuit are disposed on a substrate.

The disclosure relates to an electronic device and a method for wireless communication including a power amplification circuit. According to an embodiment, an electronic device may include: a radio frequency processing module comprising radio frequency circuitry, a first power amplification circuit connected to the radio frequency processing module, a second power amplification circuit connected to the radio frequency processing module and the first power amplification circuit, and a front-end module comprising circuitry connected to the second power amplification circuit and an antenna and configured to transmit a signal, wherein the second power amplification circuit is configured to acquire, from the first power amplification circuit, a first signal obtained by amplifying a signal output from the radio frequency processing module and a second signal by amplifying a signal output from the radio frequency processing module, based on a combination of frequency bands for a first communication scheme and a second communication scheme, and switch at least one of the first signal or the second signal to at least one output port connected to the front-end module, based on a first frequency band of the first signal and a second frequency band of the second signal. Other embodiments are also possible.

Described are concepts, systems and techniques for dividing a communication channel such that no single radio frequency (RF) power amplifier (PA) in a remote radio head (RRH) operates over an excessively wide frequency bandwidth. This allows efficient operation of the RF PA wherein each PA transmit path is tuned for operation at a respective one of a plurality of different center frequencies (f.sub.0, f.sub.0+Δf, . . . f.sub.0+(n−1)Δf where n is an integer corresponding to the number of RF PA transmit paths.

A system for split-frequency amplification, preferably including: one or more primary-band amplification stages, one or more secondary-band amplification stages, one or more band-splitting filters, and/or one or more signal couplers. An analog canceller including one or more split-frequency amplifiers. A mixer including one or more split-frequency amplifiers. A voltage-controlled oscillator including one or more split-frequency amplifiers. A method for split-frequency amplification, preferably including: receiving an input signal, separating the input signal into signal portions, and/or amplifying the signal portions, and optionally including combining the amplified signal portions and/or providing one or more output signals.

An apparatus is disclosed, comprising means for storing reference data indicative of characteristics for each of two or more amplifiers for amplifying signals in two or more respective bands, the reference data including voltage characteristics required by the particular amplifier to achieve a particular output power for a range of output power values for its respective frequency band. The apparatus may comprise means for receiving at least a first required output power for a first amplifier and a second required output power for a second amplifier, and determining, based on the reference data, the voltage characteristics required for the first amplifier to achieve the first required output power and the voltage characteristics required for the second amplifier to achieve the second required output power.