Examples of the disclosure include an amplifier system comprising an amplifier having an input to receive an input signal, and an output to provide an amplified output signal, the amplifier having a power level indicative of at least one of the input signal power and the amplified output signal power, and a linearizer coupled to the amplifier and having a plurality of modes of operation including a fully disabled mode and a fully enabled mode, the linearizer being configured to determine the power level of the amplifier, select a mode of operation of the plurality of modes of operation based on the power level of the amplifier, determine one or more linearization parameters corresponding to the selected mode of operation, and control linearization of the amplified output signal based on the determined one or more linearization parameters.

Systems and devices are provided for tracking pullup current generated by power amplifiers regardless of variations in PVT conditions. An apparatus may include one or more power amplifiers that powers components of the apparatus, a tracking circuit, and a pulse generation circuit. The tracking circuit may include an amplifier. Further, the tracking circuit may include pullup current tracking circuitry that is coupled to the amplifier and generates a first current that tracks pullup current generated by the one or more power amplifiers. Furthermore, the pulse generation circuit may include pullup current generator circuitry that generates a second current that mirrors the first current. In addition, the pulse generation circuit may also include pulse generator circuitry that is coupled to the pullup current generator circuitry and that generates a pulse to control operation of the one or more power amplifiers based at least in part on the second current.

A switch controller for charge pump tracker circuitry is disclosed. The switch controller includes first monitoring circuitry configured to monitor a first voltage across a first flying capacitor during a first discharging phase. A second monitoring circuitry is configured to monitor a second voltage across a second flying capacitor during a second discharging phase. Further included is boost logic circuitry in communication with the first monitoring circuitry and the second monitoring circuitry, wherein the boost logic circuitry is configured in response to control a first switch network coupled to the first flying capacitor and a second switch network coupled to the second flying capacitor so that the first discharging phase and the second discharging phase alternate in an interleaved mode, and so that the first discharging phase and the second discharging phase are in phase during a parallel boost mode.

Techniques for generating a power tracking supply voltage for a circuit (e.g., a power amplifier) are disclosed. The circuit may process multiple transmit signals being sent simultaneously on multiple carriers at different frequencies. In one exemplary design, an apparatus includes a power tracker and a power supply generator. The power tracker determines a power tracking signal based on inphase (I) and quadrature (Q) components of a plurality of transmit signals being sent simultaneously. The power supply generator generates a power supply voltage based on the power tracking signal. The apparatus may further include a power amplifier (PA) that amplifies a modulated radio frequency (RF) signal based on the power supply voltage and provides an output RF signal.

The invention provides a radio frequency (RF) module and associated method with envelope tracking (ET) power supply in a device. The RF module may comprise a plurality of transmitters, an ET output, and an ET multiplexer. Each said transmitter may comprise an ET port and one or more RF outputs, and may be configured for providing an RF signal to one of said one or more RF outputs, and providing an ET signal, which reflects an envelope of the RF signal, to the ET port. The ET multiplexer may be coupled between said ET ports of the plurality of transmitters and the ET output, for selectively relaying one of said ET ports to the ET output.

An average power tracking (APT) power management circuit is provided. The APT power management circuit is configured to generate a first APT voltage(s) for a first power amplifier(s) and a second APT voltage(s) for a second power amplifier(s). The APT power management circuit further includes a pair of switcher circuits that can generate a pair of reference voltages. Depending on various operating scenarios of the APT power management circuit, it is possible to selectively output any of the reference voltages as any one or more of the first APT voltage(s) and the second APT voltage(s). As such, it is possible to flexibly configure the APT power management circuit to support the various operating scenarios based on a minimum possible number of the switcher circuits, thus helping to reduce footprint and cost of the APT power management circuit.

A transmission circuit includes a power amplifier, a power amplifier forestage circuit and a signal strength adjusting circuit. The power amplifier is configured to amplify an input signal to output an output signal. The power amplifier forestage circuit is configured to output the input signal. The signal strength adjusting circuit includes a conversion circuit, a processing circuit and a storage unit. The conversion circuit is configured to convert the voltage of the output signal into an operation value. The processing circuit is configured to perform an operation according to a target index value stored by the storage unit and the operation value to obtain a differential value. The processing circuit is further configured to adjust the input signal outputted by the power amplifier forestage circuit according to the differential value, so that the power of the output signal is maintained at a target power value.

In certain aspects, a method is provided for measuring power using a resistive element coupled between a power amplifier and an antenna. The method includes squaring a voltage from a first terminal of the resistive element to obtain a first signal, squaring a voltage from a second terminal of the resistive element to obtain a second signal, and generating a measurement signal based on a difference between the first signal and the second signal. In some implementations, the resistive element is implemented with a power switch.

Apparatus and methods for bias switching of power amplifiers are provided herein. In certain configurations, a power amplifier system includes a power amplifier that provides amplification to a radio frequency (RF) signal and a bias control circuit that biases the power amplifier. The power amplifier includes an amplification transistor that receives the RF signal at an input, and a first bias network and a second bias network each connected to the input. The bias control circuit includes a first switch, a first reference current source that provides the first reference current to the first bias network through the first switch, a second switch, and a second reference current source that provides the second reference current to the second bias network through the second switch.

A failure detection system for an energy network includes a radio frequency (RF) receiver adapted to be coupled with or in close proximity to the energy network, the RF receiver providing an amplitude modulated RF signal; an RF amplifier receiving the amplitude modulated RF signal and providing an amplified signal; an envelope detector receiving the amplitude modulated RF signal and providing a demodulated envelope signal; an optional algorithm implementation system receiving the demodulated envelope signal, where the optional algorithm implementation system processes the demodulated envelope signal by one or more of a Fast Fourier transform (FFT) trigger system and a phase-locked loop (PLL) trigger system; and a signature output that is the overall output signal of the failure detection system, wherein the signature output is adapted to indicate whether the energy network is experiencing partial discharge.