10 results about "Envelope Tracking" patented technology

This invention discloses a GaN power amplifier system and control method based on envelope tracking and thermal feedback. The system includes a system control module, and an audio signal conditioning module, a programmable power supply module, a thermal feedback module, and a GaN power output module, all communicatively connected to the control module. The system control module executes dual closed-loop control logic: the first closed loop dynamically adjusts the output voltage of the programmable power supply module using envelope tracking technology, ensuring it closely follows changes in the amplitude of the audio signal, thus reducing power consumption and heat generation at the source; the second closed loop, based on real-time temperature data collected by the thermal feedback module, prioritizes dynamic compression of the low-frequency band of the audio signal or smoothly reduces the overall main volume when overheating occurs, achieving intelligent thermal derating protection without interrupting playback. This invention significantly improves the energy efficiency and reliability of the power amplifier system.

A power amplifier system is disclosed having a carrier amplifier having a first supply node, a peaking amplifier having a second supply node, and an envelope tracking (ET) circuit. The ET circuit has a first tracking amplifier that generates a first voltage signal at the first supply node, a second tracking amplifier that generates a second voltage signal at the second supply node, and a transistor coupled between the first supply node and the second supply node. A control circuit has a first input coupled to the output of either or both the first tracking amplifier and the second tracking amplifier, and a control output terminal coupled to the control input terminal of the transistor. The control circuit is configured to gradually turn on the transistor to pass current from the first supply node to the second supply node as the peaking amplifier is gradually activated.

Apparatuses and methods for power amplifier power management are disclosed. In certain embodiments, a mobile device includes a transceiver that generates a radio frequency signal, a front-end system that includes a first power amplifier module that amplifies the radio frequency signal, and a power management system that includes an envelope tracking power management unit that provides an envelope tracking supply voltage to the first power amplifier module, and a first average power tracking power management unit that provides an average power tracking supply voltage to the first power amplifier module. The first power amplifier module is configured to selectively switch between the envelope tracking supply voltage and the average power tracking supply voltage.

This invention discloses a relay-charge parallel envelope tracking power supply with multiplexed input sources, comprising: a stepped wave voltage generation circuit, an AB-class linear amplifier, a feedforward control circuit, and a pulse edge distribution unit. It improves upon conventional parallel envelope tracking power supplies by using a relay-charge switched-capacitor converter to generate a stepped wave voltage based on the modulated wave voltage output from the feedforward control circuit. By integrating a level providing unit and a level gating unit, it simultaneously reduces the switching frequency relative to the reference signal frequency l / k, thereby reducing switching losses. This facilitates further reducing the switching frequency while maintaining tracking bandwidth, simplifying the circuit structure. Multiplexing the input source of the stepped wave voltage generation circuit reduces linear amplifier losses and input power, further improving the overall circuit efficiency.

Hybrid MOSFET designs in which low ON resistance RON and high transconductance Gm values can be achieved while improving the safe operating area (SOA) of the device. Embodiments accomplish these design goals by adding a sub-gate drift region substantially only under the conductive layer of the gate structure, thereby allowing the drain to be positioned in closer proximity to the source and thus reducing RON and increasing Gm. The sub-gate drift region also reduces the peak drain-side E-field by dividing the E-field into two edges. This aspect helps push out the onset of breakdown mechanisms such as band-to-band tunneling and / or impact ionizations. Another aspect is a stepped gate oxide that is thicker in the drift region, which reduces parasitic CGD and improves the breakdown voltage, BVDSS, thus enhancing device reliability. Hybrid MOSFETs are particularly useful in cascode applications such as for envelope tracking and average power tracking.

Apparatus and methods for power amplifier envelope tracking systems with automatic control of a slew rate and a mode of an error amplifier of the envelope tracking system. The envelope tracker can include a signal bandwidth detection circuit that processes the envelope signal to generate a detected bandwidth signal, and a control circuit that controls the slew rate of the error amplifier based on the detected signal bandwidth.

An envelope tracking system has an envelope tracker that is configured to generate a power amplifier supply voltage that changes is relation to an envelope of a radio frequency signal, and a power amplifier comprises at least a first amplification stage having an input terminal receiving a radio frequency (RF) signal to be amplified. The power amplifier has a first coupling unit, and a second coupling unit inductively coupled with the first coupling unit, the second coupling unit provides radio frequency-coupled feedback to the input terminal of the first amplification stage through a radio frequency-coupled feedback path.

Apparatus and methods for power amplifier envelope tracking systems with automatic control of a slew rate and a mode of an error amplifier of the envelope tracking system. The envelope tracker can include a signal bandwidth detection circuit that processes the envelope signal to generate a detected bandwidth signal, and a control circuit that controls the slew rate of the error amplifier based on the detected signal bandwidth.

A supply modulator includes a linear regulator that generates an output voltage in an envelope tracking mode. A switching regulator operates with the linear regulator to generate the output voltage in the envelope tracking mode and to selectively generate the output voltage in an average power tracking mode. A single inductor multiple output converter operates selectively with the switching regulator to generate the output voltage in the average power tracking mode, operates to provide a power supply voltage to the linear regulator in the envelope tracking mode, and includes a first capacitor connected with a power supply terminal of the linear regulator and a second capacitor selectively connected with an output terminal of the linear regulator through a first switch. A main controller decides a tracking mode to be executed by the supply modulator.

Methods and systems for AI-based digital pre-distortion for digital envelope tracking power amplifiers. A method includes receiving a measurement of a digital envelope at a digital predistortion module having a neural network (NN)-based digital predistortion structure for a digital envelope tracking (DET) system, receiving a transmit signal at the digital predistortion module, inputting the measurement of the digital envelope and the transmit signal into a generalized memory polynomial (GMP) model of the AI-based digital predistortion structure to produce a pre-distorted transmit signal, processing the pre-distorted transmit signal using an AI model of the AI-based digital predistortion structure to produce an adjusted pre-distorted transmit signal to correct one or more non-linearities in a power amplifier operable coupled to the digital predistortion module, and generating an output signal using the power amplifier based on the adjusted pre-distorted transmit signal.