Abstract: Radio frequency (RF) communication systems with interference cancellation for coexistence are provided herein. In certain embodiments, an RF communication system includes a transmitter including a power amplifier that amplifies an RF transmit signal to generate an amplified RF transmit signal, a receiver including a low noise amplifier (LNA) that amplifies an RF receive signal, and an interference cancellation circuit. The interference cancellation circuit includes a filter that generates an analog interference cancellation signal based on filtering the amplified radio frequency transmit signal, a controllable phase circuit that provides a phase adjustment to the analog interference cancellation signal, and a controllable gain circuit that provides a gain adjustment to the analog interference cancellation signal. The interference cancellation circuit injects the analog interference cancellation signal into the LNA to compensate the receiver for interference arising from the transmitter.

Abstract: RF communication systems with interference cancellation for coexistence are provided herein. In certain embodiments, an RF communication system includes a transmitter that transmits a transmit signal through a first front end circuit, a receiver that processes a receive signal from a second front end circuit, and a feedback receiver that processes a feedback signal from the first front end circuit to generate a digital interference cancellation signal that compensates the receiver for interference arising from the transmitter.

Abstract: Envelope tracking systems for power amplifiers are provided herein. In certain embodiments, an envelope tracker system includes a first power amplifier that amplifies a first radio frequency (RF) signal and receives power from a first supply voltage, a second power amplifier that amplifies a second RF signal and receives power from a second supply voltage, and an envelope tracker including a first modulator that generates a first output current based on an envelope of the first RF signal and a plurality of regulated voltages, a second modulator that generates a second output current based on an envelope of the second RF signal and the regulated voltages, a first combiner that combines a first DC voltage with the first output current to generate the first supply voltage, and a second combiner that combines a second DC voltage with the second output current to generate the second supply voltage.

Abstract: According to some implementations, a radio-frequency (RF) device includes a communication interface coupled to a serial bus. The RF device also includes a monitoring component coupled to the communication interface, the monitoring component configured to monitor the serial bus for first data transmitted to a first device coupled to the serial bus and configure the RF device based on the first data.

Abstract: A switching circuit comprises a first filter, a second filter and a plurality of switches. The first filter is configured to filter a first frequency band, a second frequency band that is adjacent to the first frequency band and a gap band between the first frequency band and the second frequency band. The second filter is configured to filter the second frequency band. The plurality of switches is configured to route signals from an antenna through one of the first filter and second filter.

Abstract: Envelope tracking systems for power amplifiers are provided herein. In certain embodiments, an envelope tracker is provided for a power amplifier that amplifies an RF signal. The envelope tracker includes an error amplifier that controls a voltage level of a power amplifier supply voltage of the power amplifier based on amplifying a difference between a reference signal and an envelope signal indicating an envelope of the RF signal. The envelope tracker further includes a multi-level switching circuit that generates an error amplifier supply voltage based on sensing a current of the error amplifier, and uses the error amplifier supply voltage to power the error amplifier.

Abstract: Broadband feedforward power amplifiers are disclosed herein. In certain embodiments, a broadband feedforward power amplifier includes a power amplifier electrically connected between a radio frequency (RF) input and an RF output, and a feedforward compensation circuit including a first amplifier electrically connected in parallel with the power amplifier, a load impedance, and a second amplifier electrically connected between the radio frequency input and the load impedance. The feedforward compensation circuit generates a compensation signal based on sensing an output of the first amplifier and an output of the second amplifier, and provides the compensation signal to the radio frequency output to thereby compensate the power amplifier for non-linearity.

Abstract: Honeycomb cavity waveguides are disclosed. In certain embodiments, a mobile device includes an antenna and a front-end system. The front-end system includes a radio frequency circuit that outputs a radio frequency signal, and a plurality of honeycomb cavity waveguides arranged in an array. The plurality of honeycomb cavity waveguides includes a first honeycomb cavity waveguide that guides the radio frequency signal to the antenna.

Abstract: Tunable cavity waveguides are disclosed. In certain embodiments, a tunable cavity waveguide includes a controllable tunnel structure including a signal feed configured to receive a millimeter wave signal, and a plurality of controllable tunnel walls providing a waveguide for the millimeter wave signal. The unable cavity waveguide further includes a control circuit configured to control the waveguide by individually setting each of the plurality of controllable tunnel walls in a blocking state in which the millimeter wave signal is blocked or a transparent state in which the millimeter wave signal is passed.

Abstract: Crossbar switches for coarse phase shifting are disclosed. In certain embodiments, a mobile device includes an antenna array including a plurality of antennas. The mobile device further includes a front end system coupled to the antenna array and including a plurality of signal conditioning circuits each including a phase shifter. The plurality of signal conditioning circuits each provide phase shifting to a respective one of a plurality of radio frequency signals based on a fine control signal. The front end system further includes a crossbar switch coupled to the plurality of signal conditioning circuits and configured to provide phase shifting to the plurality of radio frequency signals based on a coarse control signal.

Abstract: The radio frequency front-end systems herein include modules having bandwidth controllable components, such as amplifier and filters. By implementing the modules with bandwidth control, the same module can be used for operation of multiple frequency bands including a first frequency band and a second frequency band. Thus, when implementing features such as carrier aggregation, multiple-input multiple-output (MIMO), and/or sounding resource signaling (SRS) for supporting the multiple frequency bands, the total number of modules used can be reduced and/or additional feature support can be provided compared to an implementation in which each module supports a single frequency band.

Abstract: Radio frequency front-end systems with filter reuse. In certain embodiments, a front-end system includes a filter, a low noise amplifier (LNA), and a switch interposed between the filter and an input to the LNA. In a first state of the switch, the filter serves to filter a radio frequency signal that is amplified by the LNA. The front-end system further includes a power amplifier that is coupled to the switch. Additionally, in a second state of the switch, the filter serves to filter an amplified radio frequency transmit signal provided by the power amplifier. Accordingly, a filter along a receive path of the front-end system is reused for transmit.

Abstract: Multi-level envelope trackers with an analog interface are provided herein. In certain embodiments, an envelope tracking system for generating a power amplifier supply voltage for a power amplifier is provided. The envelope tracking system includes a multi-level supply (MLS) DC-to-DC converter that outputs multiple regulated voltages, and an MLS modulator that controls selection of the regulated voltages over time based on an analog envelope signal corresponding to an envelope of the RF signal amplified by the power amplifier.

Abstract: Aspects of the disclosure include a front-end module comprising one or more receive ports configured to be coupled to a transceiver, at least one low-noise amplifier configured to be coupled to the one or more receive ports, one or more antenna ports configured to be coupled to one or more respective antennas, and a multiplexer coupled to the one or more receive ports and to the one or more antenna ports, the multiplexer being configured to route a signal received at the one or more antenna ports to a selected receive port of the one or more receive ports.

Abstract: Envelope tracking systems for power amplifiers are provided herein. In certain embodiments, an envelope tracker is provided for a power amplifier that amplifies an RF signal. The envelope tracker includes a multi-level switching circuit having an output that provides an output current that changes in relation to an envelope signal indicating an envelope of the RF signal when the envelope tracker is operating in an envelope tracking mode. The multi-level switching circuit includes a multi-level supply (MLS) modulator that receives multiple regulated voltages of different voltage levels, and an MLS control circuit that controls the selection of the MLS modulator over time based on the envelope signal. When transitioning the MLS modulator from selection of one regulated voltage level to another regulated voltage level, the MLS control circuit provides a soft transition to gradually switch the regulated voltage levels.

Abstract: Embodiments of the invention relate to a switching circuit that includes a first signal path for a first frequency range, a second signal path for a second frequency range, and one or more switches. Each of the first and second signal paths may include one or more filters configured to pass a respective region of the first or second frequency ranges. The one or more switches are configured to select one or more signal path filters based on a control signal. Related methods for filtering a radio-frequency signal, radio-frequency modules and wireless devices are also provided.

Abstract: Embodiments relate to radio-frequency front-end configurations having a shared amplifier network. The front-end configuration includes a first signal path configured to provide a first radio-frequency signal, a second signal path configured to provide a second radio-frequency signal, and a shared amplifier network that forms at least part of the first signal path and the second signal path. The shared amplifier network comprises a low noise amplifier configured to amplify received first or second radio-frequency signals and a power amplifier configured to amplify first or second radio-frequency signals for transmitting by an antenna. Related radio-frequency modules, wireless devices and methods for simultaneously transmitting and receiving a first radio-frequency signal and a second radio-frequency signal are also provided.

Abstract: Architectures and techniques relate to selectively implementing certain components to suppress emissions. For example, an emissions-suppression circuit can include a notch filter associated with a first frequency range, a switch assembly coupled to the notch filter, and a duplexer coupled to the switch assembly. The switch assembly can be configured to, in a filter state, couple the notch filter to a transmit path and configured to, in a bypass state, decouple the notch filter from the transmit path. The transmit path can be associated with two or more switch connections in the notch-filter state and associated with one switch connection in the bypass state. The duplexer can include a transmit filter that is associated with a second frequency range.

Abstract: Increased radiated power using multiple antennas is disclosed. In certain aspects, power spectral density limitations on a per antenna basis can be met while increasing radiated power for a shared channel by transmitting the signal over multiple antennas. Further aspects relate to allocating a monolithic block of modulation as a single cluster to minimize the required power back-off and maximize power density.

Abstract: Beamforming in radio frequency (RF) communication systems using frequency division duplexing (FDD) are provided. In certain embodiments, a front end system includes a first transmit path configured to process a first radio frequency transmit signal of a frequency band, the transmit path including a power amplifier and a transmit filter having a passband that passes an uplink frequency range of the frequency band, and a receive path configured to process a first radio frequency receive signal of the frequency band. The receive path includes a low noise amplifier, a switch, and a receive filter having a passband that passes a downlink frequency range of the frequency band, and the switch has a first state in which an input of the low noise amplifier is coupled to the receive filter and a second state in which an output of the power amplifier is coupled to the receive filter.