The present invention provides a receiver including a first band group, a second band group and a mixer. The first band group includes at least one LNA, wherein the first band group is configured to select one first LNA to receive a first input signal to generate an amplified first input signal. The second band group includes at least one LNA, wherein the second band group is configured to select one second LNA to receive a second input signal to generate an amplified second input signal. The first band group and the second band group are coupled to a first input terminal and a second input terminal of the mixer, respectively, and the mixer receives one of the amplified first input signal and the amplified second input signal to generate an output signal.

An amplifier for a receiver circuit is disclosed. The amplifier has an input node (V.sub.in) and an output node (V.sub.out). It comprises a tunable tank circuit connected to the output node (V.sub.out), a feedback circuit path connected between the output node (V.sub.out) and the input node (V.sub.in), and a tunable capacitor connected between an internal node of the feedback circuit path and a reference-voltage node. A receiver circuit and a communication apparatus is disclosed as well.

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.

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.

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.

One illustrative dual mode frequency multiplier embodiment includes: a first and a second nonlinear element, a summation node, and a switchable phase shifter. The first and second nonlinear elements are driven by a differential signal to produce a first and a second branch signal each having even and odd harmonics, the even harmonics being in-phase and the odd harmonics being out of phase. The first and second branch signals combine at the summation node to form a combined signal. The switchable phase shifter couples the first nonlinear element to the summation node, providing the first branch signal with a phase shift switchable between 0 and 180 to suppress either the odd or the even harmonics from the combined signal.

One illustrative dual mode frequency multiplier embodiment includes: a first and a second nonlinear element, a summation node, and a switchable phase shifter. The first and second nonlinear elements are driven by a differential signal to produce a first and a second branch signal each having even and odd harmonics, the even harmonics being in-phase and the odd harmonics being out of phase. The first and second branch signals combine at the summation node to form a combined signal. The switchable phase shifter couples the first nonlinear element to the summation node, providing the first branch signal with a phase shift switchable between 0 and 180 to suppress either the odd or the even harmonics from the combined signal.

An amplifier for a receiver circuit is disclosed. The amplifier has an input node (V.sub.in) and an output node (V.sub.out). It comprises a tunable tank circuit connected to the output node (V.sub.out), a feedback circuit path connected between the output node (V.sub.out) and the input node (V.sub.in), and a tunable capacitor connected between an internal node of the feedback circuit path and a reference-voltage node. A receiver circuit and a communication apparatus is disclosed as well.

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, including generating at least a first series and a second series of waveform coded symbols, the first series being incorporated into a first wake-up-radio (WUR) frame that is intended for a first receiving station and has a first predefined bandwidth, the second series being incorporated into a second WUR frame that is intended for a second receiving station and has a second predefined bandwidth; combining the first and second WUR frames into a multiband WUR data unit having a bandwidth that is greater than a sum of the predefined bandwidths of the first and second WUR frames; and transmitting a wake-up signal including the multiband WUR data unit in the communications channel.

The present invention provides a receiver including a first band group, a second band group and a mixer. The first band group includes at least one LNA, wherein the first band group is configured to select one first LNA to receive a first input signal to generate an amplified first input signal. The second band group includes at least one LNA, wherein the second band group is configured to select one second LNA to receive a second input signal to generate an amplified second input signal. The first band group and the second band group are coupled to a first input terminal and a second input terminal of the mixer, respectively, and the mixer receives one of the amplified first input signal and the amplified second input signal to generate an output signal.