One embodiment provides a broadband signal source. The broadband signal source includes a number, n, signal paths and a combiner circuitry. Each signal path, i, includes a programmable phase shifter circuitry, an amplifier circuitry and a harmonic generation circuitry. The programmable phase shifter circuitry is configured to phase shift a path input signal by a respective phase angle, θ.sub.i. The path input signal corresponds to a source input signal having a fundamental frequency, f, and an input signal bandwidth. The amplifier circuitry is configured to amplify the phase shifted path input signal. The harmonic generation circuitry is configured to generate a path output signal including a plurality of harmonics of the amplified phase shifted path input signal. The combiner circuitry is configured to combine the number, n, path output signals to produce a broadband output signal having an output signal center frequency greater than the input signal fundamental frequency and an output signal bandwidth greater than the input signal bandwidth.

A communication device includes an input port, a first output port, a second output port, a first output arm including one end connected to the first output port and another end connected to a branch point and including a first switching element configured to be shorted in a second mode, a second output arm including one end connected to the second output port and another end connected to the branch point and including a second switching element configured to be shorted in a first mode, and an input arm including one end connected to the input port and another end connected to the branch point and including a third switching element configured to introduce a discontinuity into a transmission line in the form of a matching element configured to change an impedance of the input arm in a divider mode.

A wireless communication device includes a first circuit including a baseband circuit and a radio circuit, and at least one frontend module (FEM) remote from the first circuit and placed in close proximity to and coupled to at least one radio-frequency (RF) antenna. The FEM is coupled to the first circuit via interface circuitry. An FEM comprises a frontend (FE) circuit including one or more low-noise amplifiers (LNAs), one or more power amplifiers (PAs), and at least one of a multi-pole switch and a multiplexer. The multi-pole switch and the multiplexer being implemented on a first side of the FEM coupled to the interface circuitry. The interface circuitry includes at least some of filters, splitters, multi-pole switches, and multiplexers to reduce a count of interconnect routes to the at least one FEM.

Embodiments relate to a multiband transceiver apparatus (100), comprising a first transmit path (110) operable to transmit a first transmit signal (sig1) in a first radio frequency band (RF.sub.1), wherein the first transmit path (110) comprises an input (112), an output (114) and a first feedback path (116) from the output towards the input of the first transmit path, a second transmit path (130) operable to transmit a second signal (sig2) in a second radio frequency band (RF.sub.2), the second radio frequency band (RF.sub.2) being different from the first radio frequency band (RF.sub.1), wherein the second transmit path (130) comprises an input (132), an output (134) and a second feedback path (136) from the output towards the input of the second transmit path, and a cross-talk canceller (150) operable to cancel cross-talk from the second feedback path (136) to the first feedback path (116) and/or to cancel cross-talk from the first feedback path (116) to the second feedback path (136) of the multiband transceiver apparatus (100).

The present disclosure relates to an antenna driver circuit for an antenna associated with a motor vehicle. The antenna driver circuit may include at least one pair of output paths to at least one antenna for forming at least one oscillatory circuit composed of in each case an antenna and at least one capacitor, and a plurality of switches in the form of MOSFETs controlled by control signals in one respective oscillatory circuit with an antenna. In the respective oscillatory circuit, at least two controllable switches may be arranged in an anti-serial fashion with respect to one another in that their drain connections are connected together, and/or source connections of controllable switches are connected to one another via an antenna.

An envelope signal time delay adjustment apparatus includes a negative group delay unit for converting an envelope signal input from a signal generator into an envelope signal having a group delay of a negative value whose frequency increases from a predetermined frequency band; an envelope-tracking modulator for power-amplifying and outputting the envelope signal output from the negative group delay unit; and a frequency limiting unit for limiting a bandwidth of the envelope-tracking modulator to be lower than an original bandwidth of the envelope-tracking modulator.

A radio frequency (RF) transmitter includes a power amplifier comprising a plurality of power amplifier cells. At least one digital signal processing module of the RF transmitter is operably coupled to the power amplifier and comprises at least one digital pre-distortion component arranged to apply at least one digital pre-distortion codeword to the plurality of power amplifier cells, wherein the at least one digital pre-distortion codeword is applied to at least one of the plurality of power amplifier cells via a digital filter. A combiner is arranged to combine outputs of the plurality of power amplifier cells thereby generating an analogue RF signal for transmission over an RF interface based at least partly on the digitally filtered at least one digital pre-distortion codeword.

A method is described for the wireless signal transmission of a measurement signal and/or a control signal between two functional components of a MR system. The measurement signal and/or the control signal is encoded into a RF transmit signal with a predefined orbital angular momentum and this RF transmit signal is transmitted between transmit antenna arrangements of the functional components. In addition, the embodiments relate to a local coil and an orbital angular momentum transmit unit with which the method may be carried out, and also a MR system that has a local coil and an orbital angular momentum transmit unit of this type.

Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.

In order to realize a power-saving power amplifier compatible with Carrier Aggregation technology using a plurality of bands, with a small size and low cost, while improving the amplitude accuracy and power efficiency, a transmission device of the present invention comprises: a modulation means that generates, from a baseband signal corresponding to each of the plurality of bands, a first and a second constant-envelope signals having different phases; a power amplification means that amplifies respective ones of the first and second constant-envelope signals generated by the modulation means; and a combining means that combines together the first and second constant-envelope signals amplified by the power amplification means and thereby generating an RF signal in which amplitude information contained in each of the baseband signals corresponding to respective ones of the plurality of bands is restored.