A radio frequency front end system has a first receive path with a first receive filter and is configured to receive a first receive signal in a first band group from a first antenna. A first additional receive path is configured to receive a radio frequency signal from the first antenna unfiltered. A first switch is configured to couple the first antenna to either the first receive path or the first additional receive path to bypass the first receive filter.

A PA module includes: a multilayer substrate having a ground pattern layer connected to a ground of a power source; amplifier transistors disposed on the multilayer substrate; a bypass capacitor having one end connected to the collector of the amplifier transistor; a first wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a second wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a third wiring line connecting the other end of the bypass capacitor and the ground pattern layer to each other; and a fourth wiring line formed between the amplifier transistor and the ground pattern layer and between the bypass capacitor and the ground pattern layer and connecting the first wiring line and the third wiring line to each other.

A base station for cancelling a transmitter noise present in a reception band, according to the embodiment of the present invention comprises: a transmitting and receiving unit for transmitting and receiving a signal; an uplink signal detector for detecting a first signal extracted from a reception path of the base station and a second signal extracted by filtering, on the basis of the reception band, a signal transmitted on a transmission path of the base station, and for determining, on the basis of the detection result, whether an uplink signal transmitted from a terminal is included in the first signal; and a processor for determining whether to cancel the transmitter noise depending on whether the uplink signal is included in the first signal.

A peer-to-peer power compensation architecture for utility power systems has a ring-pathed power transmission supply line with legs connecting a utility power source to a utility customer load, to a secondary power source, and to the utility customer load. A sinusoidal signal is injected on the first and third legs, with a predetermined amplitude, frequency and phase characteristics, wherein at least one of the characteristics being varied as function of a voltage level and a power factor of supplied power from the respective leg. A controllable power hub with an inverter is coupled to at least the first leg and the third leg, the inverter having at least one DC or AC-based power source. The injected signal's characteristics from the respective leg are evaluated to determine if the power hub's power should be introduced to the leg to compensate for under-voltage conditions.

A communication device is provided. The communication device includes: an antenna; a matching circuit connected with the antenna; a transmitter configured to generate a transmission communication signal and provide the transmission communication signal to the antenna through the matching circuit; a filter connected between the matching circuit and the antenna; and a receiver configured to receive an attenuated signal from the antenna through the filter. The filter is configured to pass frequencies of an antenna signal corresponding to a pass band and attenuate frequencies of the antenna signal corresponding to a stop band, and a center frequency of the transmission communication signal corresponds to the stop band of the filter.

A high performance low noise amplifier integrated circuit having multiple low noise amplifiers enabling operation over a wide range for frequencies is disclosed. In particular, an auxiliary input is provided to the low noise amplifier integrated circuit that can be routed to one of several low noise amplifiers, each tuned to operate efficiently in different frequency ranges.

A first attenuation circuit is connected between a node and ground, and the node is located between a ladder resonance circuit and a transmitter-side terminal. A second attenuation circuit is connected between a first parallel arm resonator of the ladder resonance circuit and ground and is connected in series to the first parallel arm resonator. The first attenuation circuit includes a second parallel arm resonator and a first switch that switches between a first state in which the second parallel arm resonator is connected to the node and a second state in which the first switch is open. The second attenuation circuit includes a capacitor and a second switch that switches between a first state in which the capacitor is connected to the first parallel arm resonator and a second state in which the first parallel arm resonator is connected to ground.

A semiconductor device includes a semiconductor chip. The semiconductor chip includes: a switching-type DC-DC converter; a pad for receiving a high frequency signal from an antenna; a balun connected to the pad and configured with a coil to output a differential signal based on the high frequency signal; an internal circuit driven by an output voltage of the DC-DC converter to process the differential signal output from the balun; and a ground voltage line that couples the internal circuit to a ground voltage source. The ground voltage line includes a first partial ground voltage line, and a second partial ground voltage line arranged to face the first partial ground voltage line with the balun interposed therebetween.

A radio frequency module includes: a module substrate having a main surface; a conductive member to partition the main surface into regions in a plan view of the main surface, and being set to ground electric potential; a switch disposed in one of the regions and connected to an antenna connection terminal; a power amplifier disposed in one of the regions and connected to the antenna connection terminal via the switch; and a low-noise amplifier disposed in one of the regions and connected to the antenna connection terminal via the switch.

A wireless communication device can include a transmitter subsystem configured to transmit a transmit signal that, once propagated from the wireless communication device, may be reflected back and received by a receiver subsystem as interference. The wireless communication device can include a self-interference cancellation subsystem configured to generate a cancellation signal to mix with received signals to mitigate self-interference effects. A performance floor for the self-interference cancellation subsystem may be determined based on a phase noise profile of an oscillator of either or both the transmitter subsystem or the receiver subsystem. The performance floor metric can be thereafter used to inform an operation or operational setting of the wireless communication device.