A radio frequency (RF) integrated circuit is provided. The RF integrated circuit supports carrier aggregation and includes first receiving circuits and a first shared phase locked loop circuit that provides a first frequency signal of a first frequency to the first receiving circuits. One of the first receiving circuits includes an analog to digital converter (ADC) and a digital conversion circuit. The ADC converts an RF signal received by the one of the first receiving circuits to a digital signal by using the first frequency signal. The digital conversion circuit generates a digital baseband signal by performing frequency down conversion on the digital signal.

A radio frequency (RF) integrated circuit is provided. The RF integrated circuit supports carrier aggregation and includes first receiving circuits and a first shared phase locked loop circuit that provides a first frequency signal of a first frequency to the first receiving circuits. One of the first receiving circuits includes an analog to digital converter (ADC) and a digital conversion circuit. The ADC converts an RF signal received by the one of the first receiving circuits to a digital signal by using the first frequency signal. The digital conversion circuit generates a digital baseband signal by performing frequency down conversion on the digital signal.

A reference signal distribution system is disclosed. The reference signal distribution system can include a power splitter to create, from a frequency-divided reference signal, a counterclockwise divided reference signal and a clockwise divided reference signal. The reference signal distribution system can include a distribution ring to provide the counterclockwise divided reference signal to a ring tap, and provide the clockwise divided reference signal to the ring tap. The reference signal distribution system can include a ring tap to produce a phase synchronization signal based the counterclockwise divided reference signal and the clockwise divided reference signal. The reference signal distribution system can include an analog regenerative frequency divider to produce a common phase reference signal based in part on the phase synchronization signal.

Wireless communication system may be configured to use different frequency bands for uplink communication and downlink communication. For example, a wireless system may use multiple frequency bands for downlink with carrier aggregation, and the wireless system may use only one frequency band for uplink. Up-conversion and down-conversion between baseband signals and RF signals, using a fixed frequency local oscillator signal may cause energy leak to an adjacent frequency band during transmission of signal and may result in interferences to other radio communication devices using the adjacent bands. To limit the amount of energy that leaks out of its assigned radio frequency bands, the UE may use local oscillator signals with different frequencies for up-conversion and down-conversion and may switch the frequencies of the local oscillator signals between reception of downlink signals and transmission of uplink signals.

In one example, a remote tuner module includes: a first tuner to receive, process and demodulate a first radio frequency (RF) signal to output an analog audio signal, and to receive and process a second RF signal to output a first downconverted modulated signal; a second tuner to receive and process the second RF signal to output a second downconverted modulated signal; a demodulator circuit coupled to the first and second tuners to demodulate and link the first and second modulated signals, to output a linked demodulated signal. The remote tuner module may further include a gateway circuit coupled to at least the demodulator circuit to output the analog audio signal and the linked demodulated signal.

A mobile terminal according to the present invention includes a first power amplifier (PA) to amplify and output a first signal of a first transceiver, a power combiner to combine a second signal of the first transceiver with a third signal of the second transceiver, a second power amplifier to amplify and output a fourth signal combined by the power combiner, and a switch to select one of a first transmission signal that is an output signal of the first power amplifier and a second transmission signal that is an output signal of the second power amplifier, wherein the first transceiver operates in a first communication system and the second transceiver operates in a second communication system, whereby a mobile terminal having improved transmission output power characteristics can be provided using the first communication system and the second communication system.

Exemplary embodiments dynamically select the LO frequency and mixer mode (i.e., low-side LO injection or high-side LO injection) for upconversion based on the desired RF output frequency in order to mitigate the effects of spurious and LO leakage signals that could violate radiation emission limits, e.g., in the case where the IF signal frequency is smaller than the RF operating band. By dynamically switching the LO frequency and mixer mode as a function of the requested operating RF channel, low-level emissions and spurious signal compliance with restricted bands can be achieved.

A multimode multiband wireless device includes a broadband RF power amplifier that receives RF signals and produces amplified RF signals in a cellular band in a broadband, and a coexist filter coupled to the input of the broadband RF power amplifier. The coexist filter can reject RF noise in a predetermined frequency range in the broadband adjacent to the cellular band.

A base station interface module included in a distributed antenna system includes: a separator configured to separate a base station signal input from a base station and output first and second base station signals; a pre-compensator configured to compensate for at least one of an amplitude and a phase of the first base station signal based on a preset compensation value; a first attenuator configured to attenuate the compensated first base station signal and to output the attenuated first base station signal to the distributed antenna system; and a second attenuator configured to attenuate the second base station signal and to terminate the attenuated second base station signal.

The portable communication terminal for communicating on at least two independent radio networks, comprises, in a single housing: Communication means (47, 49) by time multiplexing on a single radio channel, TDMA type full-duplex, for audio communication in conference and hands-free mode on a first autonomous network without infrastructure, Access means (43, 50) for half-duplex audio communication on a second autonomous network, independent from the first full-duplex network, A connection to a microphone (41) and a speaker (52), A wireless connection for a cellular telephone network, At least one pushbutton (45) for switching the communication of the microphone and the loudspeaker to and from the communication on the first network, the second network or the cellular telephone network by means of electronic switching circuits and An electronic codec type audio signal mixer (42, 51) having a plurality of inputs and outputs, configured to mix half-duplex communications on the full-duplex local area network to provide to a user, via the microphone and the loudspeaker, simultaneous access to multiple audio communications on different networks, depending on the press on the push button.