A filter circuit may include a first path having a first complex baseband filter. The circuit may further include a second path having a second complex baseband filter. The circuit may further include a combiner coupled to an output of the first complex baseband filter and an output of the second complex baseband filter.

Example systems and methods of a wireless device use first communication circuitry of the wireless device to determine a first signal level associated with a first radio frequency signal and use second communication circuitry of the wireless device to determine a second signal level associated with a second radio frequency signal. Systems and methods generate a sensitivity adjustment value based on the first signal level and the second signal level, and use the sensitivity adjustment value to process a combined signal comprising the first radio frequency signal and the second radio frequency signal.

Techniques that facilitate reconfigurable transmission of a radar frequency signal are provided. In one example, a system includes a signal generator and a power modulator. The signal generator provides a radar waveform signal from a set of radar waveform signals. The power modulator divides a local oscillator signal associated with a first frequency and a first amplitude into a first local oscillator signal and a second local oscillator signal. The power modulator also generates a radio frequency signal associated with a second frequency and a second amplitude based on the radar waveform signal, the first local oscillator signal and the second local oscillator signal.

Methods and systems for waking up a wireless receiving stations having wake-up radio (WUR) circuits. A method of providing a wake-up signal in a communications channel for a plurality of receiving stations, comprising: generating a plurality of series of waveform coded symbols, each series being incorporated into a respective wake-up-radio (WUR) frame that is intended for a respective receiving station and has a respective predefined bandwidth; combining the respective WUR frames into a multiband WUR data unit having a bandwidth that is greater than a sum of the predefined bandwidths of the wake-up radio frames; transmitting a wake-up signal including the multiband WUR data unit in the communications channel.

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.

This case is directed to supporting LB/LB, LB/MB, LB/HB and MB/HB carrier aggregation while reducing the area consumed on a transceiver and reducing power consumed on the transceiver. In some cases, four supporting such carrier aggregation may include implementing four separate radio frequency mixer chains. However, implementing four separate mixer chains may consume excessive area on the transceiver and may result in excessive transceiver power consumption. By leveraging the fact that HB LO frequency ranges overlap with LB LO frequency ranges, a dual-band gain stage may be implemented such that an LB/HB mixer may share a single LO signal (e.g., so as to provide a dual-band matching network that may provide impedance matching at LB and HB frequencies) without extending an original LB LO signal bandwidth. The dual-band gain stage may reduce space and power consumed on the transceiver while maintaining support for LB/LB, LB/MB, LB/HB and MB/HB carrier aggregation.

This case is directed to supporting LB/LB, LB/MB, LB/HB and MB/HB carrier aggregation while reducing the area consumed on a transceiver and reducing power consumed on the transceiver. In some cases, four supporting such carrier aggregation may include implementing four separate radio frequency mixer chains. However, implementing four separate mixer chains may consume excessive area on the transceiver and may result in excessive transceiver power consumption. By leveraging the fact that HB LO frequency ranges overlap with LB LO frequency ranges, a dual-band gain stage may be implemented such that an LB/HB mixer may share a single LO signal (e.g., so as to provide a dual-band matching network that may provide impedance matching at LB and HB frequencies) without extending an original LB LO signal bandwidth. The dual-band gain stage may reduce space and power consumed on the transceiver while maintaining support for LB/LB, LB/MB, LB/HB and MB/HB carrier aggregation.

A transceiver circuit includes a receiver front end utilizing a ring oscillator, and a transmitter front end utilizing a pass-gate circuit in a first feedback path across a last-stage driver circuit. The transceiver circuit provides low impedance at low frequency and high impedance at high frequency, and desirable peaking behavior.

A receiver includes a tunable receiving chain, configured to receive a subframe header when tuned to a first receiving bandwidth; a decoder, configured to decode an allocation information from the subframe header, the allocation information indicating an allocation of a plurality of resource blocks in the subframe; and a controller, configured to derive a second receiving bandwidth from the allocation information and to tune the receiving chain to the second receiving bandwidth.

A signal source with a wireless frequency reference. A signal loop includes an amplifier and a coupler. The magnitude of the loop gain in the signal loop is substantially equal to 1 at a steady-state amplitude of a signal at a fundamental frequency. A reference oscillator is coupled to the loop through the coupler, via a wireless link, and provides phase stabilization. The loop may include a nonlinear transmission line, to generate a comb output spectrum.