An electronic device and method for supporting carrier aggregation are provided. An electronic device may include a communication circuit including a plurality of local oscillators; and a processor configured to determine an operation mode of at least one local oscillator among the plurality of oscillators based on at least one of a number of uplink carriers and a number of downlink carriers; and control the at least one local oscillator to operate based on the determined operation mode.

Proposed is a 5G common filter with excellent PIMD performance using a coupling method upon combining frequency bands and a filtering method therewith that are capable of combining outputs of multiple carriers into one and transmitting it to an antenna by improving PIMD performance and are capable of improving PIMD performance of common couplers by changing coupling methods depending on frequency band signals of multiple carriers including 5G. The 5G common filter with excellent PIMD performance using a coupling method upon combining frequency bands in accordance with the present invention comprises a first coupler for combining a first band signal and a second band signal; and a second coupler for combining output of the first coupler and a third band signal.

Proposed is a 5G common filter with excellent PIMD performance using a coupling method upon combining frequency bands and a filtering method therewith that are capable of combining outputs of multiple carriers into one and transmitting it to an antenna by improving PIMD performance and are capable of improving PIMD performance of common couplers by changing coupling methods depending on frequency band signals of multiple carriers including 5G. The 5G common filter with excellent PIMD performance using a coupling method upon combining frequency bands in accordance with the present invention comprises a first coupler for combining a first band signal and a second band signal; and a second coupler for combining output of the first coupler and a third band signal.

A multi-radio access technology (RAT) circuit is provided. The multi-RAT circuit includes a radio frequency (RF) circuit(s) coupled to an interconnect medium(s). The RF circuit(s) includes a power head circuit configured to receive a local oscillation (LO) pilot and an RF signal via the interconnect medium(s). The power head circuit generates an LO signal based on the LO pilot without requiring a synthesizer. Accordingly, the power head circuit modulates the RF signal to a carrier band based on the LO signal for transmission in a millimeter wave (mmWave) spectrum. By generating the LO signal and modulating the RF signal to the carrier band in the power head circuit, it may be possible to minimize attenuation and/or interference to the RF signal. Further, it may also be possible to share the interconnect medium(s) with existing RATs, thus helping to reduce size, power, and cost impacts associated with supporting an mmWave RAT.

A transmission device includes a modulation unit that performs chirp-spread modulation on an input information series to generate a modulation signal; a delay unit that provides, to a plurality of modulation signals obtained by duplicating the modulation signal generated by the modulation unit, delays having lengths different from each other, a difference between the delays being an integral multiple of a reciprocal of a bandwidth of the modulation signal; and a plurality of transmission antennas that transmit the plurality of modulation signals, respectively, to which the delays are provided by the delay unit.

Various schemes for mitigating radio frequency (RF) interference are described, wherein an adaptive local oscillator (LO) is utilized. A receiver measures a jamming indicator which indicates a total power within a receiving band of the receiver. If the jamming indicator indicates a presence of substantial in-band interference, the receiver may program the LO to a different frequency and/or adjust a bandwidth of a filter accordingly to reject or reduce the interference. The receiver may adjust the LO and/or the filter repeatedly until the interference is rejected to a point that de-sense to the signal intended to be received is satisfactorily mitigated. The receiver may restore the LO and the filter to a default setting when the jamming indicator indicates that the interference is no longer present.

Techniques for mitigating interference between coexisting Bluetooth baseband processing circuitry and Wireless Local Area Network (WLAN) baseband processing circuitry are disclosed. In some implementations, an oscillator control circuit may determine a first operating frequency associated with the WLAN baseband processing circuitry. The oscillator control circuit may determine a second operating frequency associated with the Bluetooth baseband processing circuitry. The oscillator control circuit may detect overlap between the first operating frequency and the second operating frequency. The oscillator control circuit may adjust an oscillator sideband for an oscillator of the Bluetooth baseband processing circuitry based on the detected overlap to mitigate interference between signals generated by the oscillator of the Bluetooth baseband processing circuitry and the first operating frequency associated with the WLAN baseband processing circuitry.

A front-end receiver includes a first mixer of a first channel, a second mixer of a second channel, and a switching circuit that is configured to select the first mixer or the second mixer during a particular time period. Upon being selected, one of the first mixer or the second mixer is configured to deliver a down-converted signal that down-converts a respective RF signal of either the first or second reception channel. As the tasks of down-conversion and multiplexing are combined at the mixer level, the first and second reception channels may share a baseband circuit while being able to provide a well-balanced metrics of channel isolation, low noise figure, and linearity.

Systems, methods, and circuitries are provided to generate a radio frequency (RF) signal having a desired radio frequency f.sub.RF. In one example a frequency synthesizer system includes a clock, an opportunistic phase locked loop (PLL), and an RF PLL. The clock circuitry is configured to generate a clock signal having a frequency f.sub.XTL. The opportunistic phase locked loop (PLL) is configured to generate a reference signal having a reference frequency f.sub.REF that is close to a free-running frequency of an oscillator in the opportunistic PLL. The opportunistic PLL is configured to synchronize the reference signal to the clock signal. The RF PLL is configured to generate the RF signal having the desired radio frequency and to synchronize the RF signal with the reference signal.

We disclose multiband receivers for millimeter-wave devices, which may have reduced size and/or reduced power consumption. One multiband receiver comprises a first band path comprising a first passive mixer configured to receive a first input RF signal having a first frequency and to be driven by a first local oscillator signal having a frequency about the first frequency; a second band path comprising a second passive mixer configured to receive a second input RF signal having a second frequency and to be driven by a second local oscillator signal having a frequency about the second frequency; and a base band path comprising a third passive mixer configured to receive intermediate RF signals during a duty cycle and to be driven by a third local oscillator signal having a frequency about the first frequency or about the second frequency during the duty cycle.