A semiconductor IC includes a first radio-frequency element (e.g., an inductor in a low-noise amplifier), a second radio-frequency element (e.g., an inductor in a low-noise amplifier), a first via conductor (e.g., a via conductor that is placed between the first radio-frequency element and the second radio-frequency element and that is connected to a ground potential.

Power amplification system with variable supply voltage. A power amplification system can include a power amplifier and a boost converter configured to provide a supply voltage to the power amplifier. The power amplification system can include a control system configured to provide a boost converter control signal to the boost converter to adjust the supply voltage based on a parameter associated with the power amplifier.

A radio frequency filter includes communication bandpass filters disposed corresponding respectively to a plurality of communication bands, a switch, and a matching circuit. The switch includes a common terminal and a plurality of optionally selectable terminals, the plurality of optionally selectable terminals being individually connected to the plurality of bandpass filters in a one-to-one relation. The matching circuit is connected to the common terminal and is a common matching circuit to the plurality of communication bandpass filters. The plurality of communication bandpass filters are set such that filter characteristics of a serial circuit in combination of one of the plurality of communication bandpass filters, the one being selected by the switch, and the common matching circuit are improved in comparison with filter characteristics of the selected communication bandpass filter with respect to the communication band corresponding to the selected communication bandpass filter.

Transmitters having increased efficiency, such as may be useful in millimeter-wave devices. A semiconductor device, comprising a transmitter, comprising a modulator configured to receive a differential input signal having a first frequency and provide a differential modulated signal having the first frequency and a first clock phase; a series comprising one or more frequency multipliers, wherein the series of frequency multipliers is configured to receive the differential modulated signal and provide a differential second signal having a second frequency greater than the first frequency and having a second clock phase; and an output transformer configured to receive the differential second signal and transform the differential second signal to a single-ended output signal. Methods of using such transmitters. Systems for manufacturing devices comprising such transmitters.

A low frequency loss correction circuit that improves the efficiency of a power amplifier at near-DC low frequencies The low frequency loss correction circuit can include a signal error detection circuit configured to produce an error signal in response to detecting one or more frequency components of a tracking signal below a cutoff frequency that are substantially attenuated through a capacitive path. The low frequency loss correction circuit can include a drive circuit configured to convert the error signal into a low frequency correction signal, and provide the low frequency correction signal to a voltage supply line, the low frequency correction signal including at least some of the one or more frequency components of the tracking signal below a cutoff frequency that are substantially attenuated through the capacitive path.

Switchable base feed circuit for radio-frequency (RF) power amplifiers. In some embodiments, an RF power amplifier (PA) circuit can include a transistor having a base, a collector, and an emitter, with the transistor being configured to amplify an RF signal. The PA circuit can further include a bias circuit configured to provide a base bias signal to the base of the transistor. The PA circuit can further include a switchable base feed circuit implemented between the bias circuit and the base of the transistor. The switchable base feed circuit can be configured to provide a plurality of different resistance values for the base bias signal between the bias circuit and the base of the transistor. Such a PA circuit can be implemented in products such as a die, a module, and a wireless device.

A low noise amplifier includes a first input transistor coupled to an input signal and a second input transistor coupled to the input signal. The low noise amplifier also includes a first output transistor, coupled between the first input transistor and a first carrier aggregation load, configured to connect the first input transistor to the first carrier aggregation load. Additionally, the low noise amplifier includes a second output transistor, coupled between the first input transistor and a second carrier aggregation load, configured to connect the first input transistor to the second carrier aggregation load. Further, the low noise amplifier includes a third output transistor, coupled between the second input transistor and the second carrier aggregation load, configured to connect the second input transistor to the second carrier aggregation load. Also included are a method of operating a low noise amplifier and an extended carrier low noise amplifier.

A predistortion circuit for a wireless transmitter includes a signal input configured to receive a baseband signal. Further, the predistortion circuit includes a predistorter configured to generate a predistorted baseband signal using the baseband signal and a select of one of a first predistorter configuration and a second predistorter configuration.

A signal transmitting-receiving apparatus includes a first switching section, a second switching section, a controller, and an isolation unit. The first switching section is configured to connect Bluetooth signal receiving lines to a Bluetooth antenna. The second switching section configured to connect antennas to one of a Bluetooth receiving terminal, a Wi-Fi signal receiving terminal, and a Wi-Fi signal transmitting terminal. The controller is configured to signal process the Bluetooth signal and a Wi-Fi signal that are transmitted and received. The isolation unit is configured to suppress a signal coupling between the transmitted Bluetooth signal and the Bluetooth signal receiving lines.

Systems, devices and methods related to diversity receivers. In some embodiments, a receiving system can include a controller configured to selectively activate one or more of a plurality of paths between an input and an output, and a plurality of amplifiers, with each one of the plurality of amplifiers disposed along a corresponding one of the plurality of paths and configured to amplify a signal received at the amplifier. The receiving system can further include two or more of features including (a) variable-gain amplifiers, (b) phase-shifting components, (c) impedance matching components, (d) post-amplifier filters, (e) a switching network, and (f) flexible band routing. In some embodiments, such a receiving system can be implemented as a diversity receive (DRx) module.