Disclosed are a predistortion method and system, a device, and a non-transitory computer-readable storage medium. The predistortion method is applicable to a predistortion system which may include a predistortion multiplier, a complex neural network, and a radio frequency power amplifier output feedback circuit. The method may include: inputting a training complex vector to the predistortion system to obtain a complex scalar corresponding to the training complex vector, which is output by the predistortion system; training the predistortion system based on the training complex vector and the complex scalar until a generalization error vector magnitude and a generalization adjacent channel leakage ratio corresponding to the predistortion system meet set requirements; and inputting a service complex vector to the trained predistortion system to obtain a predistortion corrected complex scalar.

Disclosed are a predistortion method and system, a device, and a non-transitory computer-readable storage medium. The predistortion method is applicable to a predistortion system which may include a predistortion multiplier, a complex neural network, and a radio frequency power amplifier output feedback circuit. The method may include: inputting a training complex vector to the predistortion system to obtain a complex scalar corresponding to the training complex vector, which is output by the predistortion system; training the predistortion system based on the training complex vector and the complex scalar until a generalization error vector magnitude and a generalization adjacent channel leakage ratio corresponding to the predistortion system meet set requirements; and inputting a service complex vector to the trained predistortion system to obtain a predistortion corrected complex scalar.

A switching audio amplifier and method of operation. The switching audio amplifier comprises a voltage supply selector coupling a power supply input to a first power supply voltage; a switching circuit generating a drive signal for a loudspeaker by modulating the power supply input based on a modulation signal; a pulse generator receiving an audio input signal and outputting the modulation signal based on the audio input signal and the voltage of the power supply input; and a supply voltage monitor. The supply voltage monitor is configured to increase the voltage of the power supply input by causing the voltage supply selector to couple the power supply input to a second power supply voltage responsive to the modulation signal exceeding the first threshold, and the supply voltage monitor preventing the voltage supply selector from reducing the voltage of the power supply input for a first time period.

An amplifier unit includes an amplifier, a bias circuit, an inductor, a variable resistor circuit, and a control circuit. The amplifier includes an amplifier transistor that amplifies an input radio-frequency signal. The bias circuit is connected to the amplifier. The inductor is connected between and in series with the amplifier and the bias circuit. The variable resistor circuit is connected to the inductor. The control circuit includes a measuring circuit and a comparison circuit. The measuring circuit measures an amplification characteristic value of the amplifier transistor. The comparison circuit compares the amplification characteristic value measured by the measuring circuit with a reference value. The control circuit controls the variable resistor circuit based on a comparison result of the comparison circuit.

The present invention relates to an operational amplifier, including: a symmetrical differential amplifier; a local common mode feedback circuit coupled to the symmetrical differential amplifier; a tail current source circuit including at least one first transistor and a second transistor and a current source resistor. The tail current source circuit is configured to adjust a control voltage of the first transistor by using the second transistor such that a predetermined reference current flows through a load path of the first transistor.

The present invention relates to an operational amplifier, including: a symmetrical differential amplifier; a local common mode feedback circuit coupled to the symmetrical differential amplifier; a tail current source circuit including at least one first transistor and a second transistor and a current source resistor. The tail current source circuit is configured to adjust a control voltage of the first transistor by using the second transistor such that a predetermined reference current flows through a load path of the first transistor.

A radio-frequency module includes a module substrate, a power amplifier, and a control circuit configured to control the power amplifier. The control circuit includes a temperature sensor. The power amplifier and the control circuit are stacked one on top of another on a principal surface of the module substrate.

A radio-frequency module includes a module substrate, a power amplifier, and a control circuit configured to control the power amplifier. The control circuit includes a temperature sensor. The power amplifier and the control circuit are stacked one on top of another on a principal surface of the module substrate.

The present invention discloses a bias compensation circuit. The bias compensation circuit includes a detecting circuit, including a diode-connected transistor circuit, with a first end for receiving a first current, and a second end coupled to a first reference voltage end; and a first diode circuit, with a first end for receiving a second current, and a second end coupled to the first reference voltage end; wherein the detecting circuit provides a first voltage level according to the diode-connected transistor circuit, and provides a second voltage level according to the first diode circuit; a voltage-current converting circuit, coupled to the detecting circuit, for generating a first reference current according to the first voltage level and the second voltage level; and a bias circuit, coupled to the voltage-current converting circuit, for receiving the first reference current, to provide a bias voltage level according to the first reference current.

The present invention discloses a bias compensation circuit. The bias compensation circuit includes a detecting circuit, including a diode-connected transistor circuit, with a first end for receiving a first current, and a second end coupled to a first reference voltage end; and a first diode circuit, with a first end for receiving a second current, and a second end coupled to the first reference voltage end; wherein the detecting circuit provides a first voltage level according to the diode-connected transistor circuit, and provides a second voltage level according to the first diode circuit; a voltage-current converting circuit, coupled to the detecting circuit, for generating a first reference current according to the first voltage level and the second voltage level; and a bias circuit, coupled to the voltage-current converting circuit, for receiving the first reference current, to provide a bias voltage level according to the first reference current.