An electronic device may include wireless circuitry with a processor, a transceiver, an antenna, and a front-end module coupled between the transceiver and the antenna. The front-end module may include one or more power amplifiers for amplifying a signal for transmission through the antenna. A power amplifier may include an amplitude modulation distortion compensation circuit coupled to the input of the power amplifier. The compensation circuit may include adaptive biasing transistors each having a first source-drain terminal coupled to the input of the power amplifier, a second source-drain terminal coupled to a supply voltage, and a gate terminal configured to receive a control voltage via a big resistor. The control voltage can be set to a voltage level so that the adaptive biasing transistors are only turned on when the voltage swing at the input of the power amplifier is relatively large.

An electronic device may include wireless circuitry with a processor, a transceiver, an antenna, and a front-end module coupled between the transceiver and the antenna. The front-end module may include one or more power amplifiers for amplifying a signal for transmission through the antenna. A power amplifier may include a phase distortion compensation circuit. The phase distortion compensation circuit may include one or more n-type metal-oxide-semiconductor capacitors configured to receive a bias voltage. The bias voltage may be set to provide the proper amount of phase distortion compensation.

Examples described herein provide a radio frequency circuit. The radio frequency circuit includes a controller; a parameter estimator circuit; a capture circuit; and a pre-distorter circuit. The pre-distorter generally includes one or more nonlinear filter circuits and configurable hardware circuitry. Each of the one or more the nonlinear filter circuits includes: adder(s); multiplier(s); and memories coupled to at least one of the adder(s) and the multiplier(s); where the configurable hardware circuitry is configured to distort one or more input signals by directing the one or more input signals along a path through the one or more adders, the one or more multipliers, and the one or more memories and by distorting the one or input signals using the nonlinear parameters stored in the one or more memories as the one or more input signals travels the path.

An apparatus is disclosed for passive intermodulation distortion filtering. The apparatus includes a radio-frequency front-end circuit. The radio-frequency front-end circuit includes a transmit filter circuit and a receive filter circuit. The transmit filter circuit includes a passive circuit configured to combine at least two radio-frequency transmit signals associated with different transmit frequency bands. The transmit filter circuit also includes a filter coupled between the passive circuit and a first feed of an antenna. The filter is configured to attenuate frequencies associated with a receive frequency band. The receive filter circuit is coupled to a second feed of the antenna and is configured to pass the frequencies associated with the receive frequency band.

Examples described herein include methods, devices, and systems which may compensate input data for nonlinear power amplifier noise to generate compensated input data. In compensating the noise, during an uplink transmission time interval (TTI), a switch path is activated to provide amplified input data to a receiver stage including a recurrent neural network (RNN). The RNN may calculate an error representative of the noise based partly on the input signal to be transmitted and a feedback signal to generate filter coefficient data associated with the power amplifier noise. The feedback signal is provided, after processing through the receiver, to the RNN. During an uplink TTI, the amplified input data may also be transmitted as the RF wireless transmission via an RF antenna. During a downlink TTI, the switch path may be deactivated and the receiver stage may receive an additional RF wireless transmission to be processed in the receiver stage.

The disclosure provides a method for measuring a power of a non-constant envelope modulated signal, an electronic device, and a computer readable storage medium. The method includes: sampling baseband I/Q data transmitted by a device under test to obtain sample data, in which a sampling duration is less than a length of a cycle of the non-constant envelope modulated signal; calculating a sample power within the sampling duration based on the sample data; matching in predetermined baseband I/Q data in the cycle based on the sample data to obtain a target baseband I/Q data segment; obtaining a power calibration value corresponding to the target baseband I/Q data segment; and obtaining an actual power of the non-constant envelope modulated signal in the cycle based on the power calibration value corresponding to the target baseband I/Q data segment and the sample power within the sampling duration.

A device for wireless communications can include a phase selector, a coarse delay line, and a digitally controlled edge interpolator (DCEI). The phase selector receives an input signal and is coupled to the coarse delay line. The coarse delay line can provide one of a plurality of delay ranges. A DCEI, connected to the coarse delay line can provide a fine delay output signal.

A power amplification circuit may comprise a power distributor configured to receive a radio frequency (RF) signal and output a first RF signal and a second RF signal, a first power amplifier configured to receive the first RF signal from the power distributor and amplify the first RF signal based on a first bias, a second power amplifier configured to receive the second RF signal from the power distributor and amplify the second RF signal based on a second bias, an impedance matching circuit configured to receive the first RF signal amplified by the first power amplifier and the second RF signal amplified by the second power amplifier, and a protection circuit configured to identify a current input to a bias terminal of the second power amplifier and, control a magnitude of the current input to the bias terminal based on the identified input current.

In an electronic device and an operation method of the electronic device according to various embodiments, a communication circuit of the electronic device may comprise: a first transmission chain which outputs a first transmission signal through a first antenna; a second transmission chain which outputs a second transmission signal through a second antenna; a first amplifier which is electrically connected to the first transmission chain, and amplifies the first transmission signal output from the first transmission chain; and a second amplifier which is electrically connected to the second transmission chain, and amplifies the second transmission signal output from the second transmission chain, where the second amplifier is configured to have an output end connected to an output end of the first amplifier through a transmission line, and output the second transmission signal received from the second transmission chain to the first antenna through the transmission line. Various other embodiments may be possible.

An amplifier circuit comprising a power amplifier and a protection circuit coupled to the power amplifier. The protection circuit is configured to detect an overdrive condition and, in response to detecting an overdrive condition, apply a clamping status to the protection circuit to reduce a bias current to the power amplifier. The protection circuit has a capacitor and a recovery circuit including: a sensing component configured to monitor a change of charging and discharging currents to and from the capacitor respectively during the clamping status; a first device configured to set a time constant of the recovery circuit; and a second device configured to reset the protection circuit to remove the clamping status when the change of charging or discharging current is beyond a predetermined threshold.