Disclosed is a technology related to a low noise amplifier applied between an RF receiver and an RF switch. A phase difference matching circuit having the same phase difference as a positive gain amplifier is added to an output terminal of an attenuator of a low noise amplifier having a variable gain switching structure. In addition, a variable impedance circuit connected to an output terminal of the positive gain amplifier and an output terminal of a phase difference matching unit to finely adjust the phase difference of each output terminal may be further included.

In one embodiment, an apparatus includes a clock generator circuit to receive a first clock signal at a first frequency and output a second clock signal at a second frequency less than the first clock frequency. The clock generator circuit may include: a divider circuit to divide the first clock signal to obtain at least a first divided clock signal and a second divided clock signal; and a gating circuit coupled to the divider circuit, the gating circuit to gate the first clock signal with at least one of the first divided clock signal and the second divided clock signal to output the second clock signal.

Methods and devices to implement efficiently an AUX terminal in RF front end receivers using LNAs are described. The described methods implement a smaller number of switches resulting in an overall performance improvement by reducing the noise figure at the input of the LNA. The presented devices can be used in low/high gain and bypass modes and can accommodate an arbitrary number of bands over a wide frequency range.

There is provided an antenna arrangement for a radio transceiver device. The antenna arrangement comprises at least two antenna arrays, wherein at least one of the at least two antenna arrays has antenna elements of two polarizations. The antenna elements of one polarization at each of the at least two antenna arrays define a respective set of antenna elements. The antenna arrangement comprises at least two baseband chains. The antenna arrangement comprises a switching network configured to selectively operatively connect each of the at least two baseband chains with its own set of antenna elements such that no two baseband chains are operatively connected to one and the same set of antenna elements. Each of the at least one antenna array that has antenna elements of two polarizations is operatively connected to the switching network via a respective hybrid connector configured to provide a signal from one of the baseband chains to antenna elements of both polarizations.

Examples disclosed herein relate to a high gain active relay antenna system. The active relay antenna system comprises a first antenna pair having a first receive antenna and a first transmit antenna to communicate wireless signals in a forward link from a base station to a plurality of users; and a second antenna pair having a second receive antenna and a second transmit antenna to communicate wireless signals in a return link from the plurality of users to the base station. The active relay antenna system further comprises a first active relay section and a second active relay section to provide for adjustable power gain in the wireless signals.

A radio-frequency module including a module substrate having a first main surface and a second main surface on opposite sides; a low-noise amplifier disposed on the second main surface; and a power amplifier circuit in a Doherty configuration. The power amplifier including a first phase circuit; a second phase circuit; a carrier amplifier disposed on the first main surface and including an input terminal connected to a first end of the first phase circuit and an output terminal connected to a first end of the second phase circuit; and a peaking amplifier disposed on the first main surface and including an input terminal connected to a second end of the first phase circuit and an output terminal connected to a second end of the second phase circuit.

Methods and devices used in mobile receiver front end to support multiple paths and multiple frequency bands are described. The presented devices and methods provide benefits of scalability, frequency band agility, as well as size reduction by using one low noise amplifier per simultaneous outputs. Based on the disclosed teachings, variable gain amplification of multiband signals is also presented.

An amplifier and corresponding method include a field-effect transistor (FET) amplifier and a cascode FET. Each FET may operate with a positive ratio between its third-order nonlinearity coefficient and its linear gain. An inductor added at a gate of the cascode FET, operatively coupled with other components in a circuit, results in a first equivalent impedance looking into an input of the cascode FET. The first equivalent impedance may substantially offset a distortion output of the FET amplifier based upon the added inductor. The inductor operatively coupled with the circuit may result in a second equivalent impedance looking out of the gate of the cascode FET. The second equivalent impedance may substantially offset a distortion output of the cascode FET based upon the added inductor. In addition, a programmable capacitor connected between the gate and drain of the cascode FET may further substantially offset a distortion output of each FET.

A radio-frequency module includes an integrated circuit (IC) device and an external inductor provided outside the IC device. The IC device includes a plurality of low-noise amplifiers, one or more inductors, and a switching circuit. The plurality of low-noise amplifiers includes a plurality of transistors in one to one correspondence. The one or more inductors are coupled to one or more of the plurality of transistors. Each inductor is coupled to the emitter or source of a corresponding one of the plurality of transistors. The switching circuit is coupled between the emitter or source of each of the plurality of transistors and the external inductor. The external inductor is coupled between the switching circuit and ground in series with each of the one or more inductors via the switching circuit.

An aspect relates to an apparatus including a radio frequency (RF) signal power detector. The RF signal power detector includes a first current source configured to generate a first current based on a power level of a first RF signal; a transimpedance amplifier (TIA) configured to generate a first voltage based on the first current, wherein the TIA is coupled between a first upper voltage rail and a lower voltage rail; and a second current source configured to generate a second current related to the first current, wherein the first and second current sources are coupled in series between a second upper voltage rail and the lower voltage rail.