公开(公告)号：US20200304082A1

公开(公告)日：2020-09-24

申请号：US16765668

申请日：2017-12-15

Applicant: Apple Inc.

Inventor： Stephan Henzler ,  Andreas Langer ,  Otto Schumacher

IPC: H03F3/24 ,  H03F3/195 ,  H03F1/02 ,  H03F1/32 ,  H04B1/38

Abstract: A device for digital envelope tracking with dynamically changing voltage levels for a radio frequency (RF) power amplifier is disclosed. A power management unit generates a set of supply voltages for a power amplifier based on a control signal. A setpoint generator in the power management integrated circuit gradually increases or decreases a target voltage such that the set of supply voltages output from the voltage converter gradually increase or decrease in response to a gradual transition of the target voltage. A transceiver includes digital models for replicating a behavior of the setpoint generator and a voltage regulator in the voltage converter such that a signal pre-distortion unit may use an instantaneous voltage level for signal predistortion.

公开(公告)号：US20240322759A1

公开(公告)日：2024-09-26

申请号：US18736273

申请日：2024-06-06

Applicant: Apple Inc.

Inventor： Stephan Henzler ,  Andreas Langer

IPC: H03F1/02 ,  H03F3/21 ,  H04B1/04

CPC classification number: H03F1/0288 ,  H03F3/211 ,  H04B1/0475 ,  H03F2200/451 ,  H04B2001/0416

Abstract: An electronic device may include wireless circuitry with a processor that generates baseband signals, an upconversion circuit that upconverts the baseband signals to radio-frequency signals, a power amplifier, an antenna, and a transmit filter with a frequency dependent filter response coupled between the output of the power amplifier and the antenna. To help mitigate the frequency dependent filter response, the wireless circuitry may further include predistortion circuitry having an amplifier load response estimator that implements a baseband model of the filter response, an amplifier non-linearity estimator that models the non-linear behavior of the amplifier, and a control signal generator for adjusting the power amplifier based on the output of the amplifier load response estimator and the amplifier non-linearity estimator.

公开(公告)号：US20240146338A1

公开(公告)日：2024-05-02

申请号：US18296295

申请日：2023-04-05

Applicant: Apple Inc.

Inventor： Stephan Henzler ,  Andreas Langer

IPC: H04B1/00 ,  H04B1/14

CPC classification number: H04B1/0028 ,  H04B1/14

Abstract: An electronic device may include wireless circuitry having an amplifier configured to receive a radio-frequency signal generated from a baseband signal, a first adjustable load component coupled to an output of the amplifier, a second adjustable load component coupled to the output of the amplifier, and a control signal generator configured to output one or more control signals for tuning the first and second adjustable load components based on an envelope of the baseband signal or the radio-frequency signal. The first adjustable load component can provide a first tuning range covering a first subrange of an instantaneous signal envelope of the baseband signal or the radio-frequency signal, whereas the second adjustable load can provide a second tuning range covering a second subrange of the instantaneous signal envelope of the baseband signal or the radio-frequency signal. The first and second tuning ranges are combined to provide an extended tuning range.

公开(公告)号：US20240097636A1

公开(公告)日：2024-03-21

申请号：US17943399

申请日：2022-09-13

Applicant: Apple Inc.

Inventor： Andrea Camuffo ,  Andreas Langer ,  Guenther Hackl ,  Stephan Henzler

IPC: H03G3/30 ,  H04W52/52

CPC classification number: H03G3/3042 ,  H04W52/52

Abstract: This disclosure is directed to compensating for gain drift due to switching the output power of a transmitter of an electronic device. In some cellular network applications, the transmit power level of a transmitter may be frequently adjusted from a low power level to a high power level. If the power level is not switched to the desired power level within a given interval, the transmission signal may be distorted. To enable the transmitter to reach a desired output power within the interval, the voltage supply of a power amplifier may be raised during a low power symbol, which may produce an undesirable gain increase. To mitigate or eliminate the low power symbol gain increase, a gain compensation signal may be introduced into the transmitter. The compensation signal may be adjusted and refined by implementing a power control loop, the power control loop may include a power controller.

公开(公告)号：US20250055425A1

公开(公告)日：2025-02-13

申请号：US18672498

申请日：2024-05-23

Applicant: Apple Inc.

Inventor： Stephan Henzler ,  Andreas Langer

IPC: H03F3/189 ,  H03F1/02 ,  H03G3/00 ,  H04B1/04

Abstract: An electronic device may include wireless circuitry. The wireless circuitry may include a radio-frequency amplifier having a data input configured to receive a radio-frequency signal generated from a baseband signal, supply modulation blocks configured to output a power supply voltage, derived from the baseband signal, for powering the radio-frequency amplifier, and load modulation blocks configured to output a load control signal, derived from the baseband signal and a bandwidth reduced envelope signal output from the supply modulation circuitry, for tuning an adjustable load component of the radio-frequency amplifier. The supply modulation blocks can include a full envelope generator, a bandwidth reduction block for outputting the bandwidth reduced envelope signal, an envelope shaping block, and an envelope tracker. The load modulation blocks can include an inverse amplifier gain model and a load shaping block.

公开(公告)号：US20240014833A1

公开(公告)日：2024-01-11

申请号：US18321454

申请日：2023-05-22

Applicant: Apple Inc.

Inventor： Stephan Henzler ,  Pedro Mirassol Tomé ,  Andreas Langer ,  Alexander Klinkan

IPC: H04B1/00 ,  H04B1/04

CPC classification number: H04B1/0096 ,  H04B1/0089 ,  H04B1/0475 ,  H04B2001/0416

Abstract: An electronic device may include wireless circuitry. The wireless circuitry may include at least a digital predistortion circuit, an upconversion circuit, and a load-line modulated amplifier circuit. The digital predistortion circuit can be configured to receive a reference baseband signal from one or more processors and to selectively output a predistorted version of the reference baseband signal. The upconversion circuit can be configured to receive a signal from the digital predistortion circuit and to output a radio-frequency signal. The load-line modulated amplifier circuit can be configured to amplify the radio-frequency signal. The load-line modulated amplifier circuit can include an adjustable load component. The adjustable load component can have a constant impedance when an instantaneous signal amplitude of the reference baseband signal is within a first range and can be tuned to have a varying impedance when the instantaneous signal amplitude of the reference baseband signal is within a second range.

公开(公告)号：US10862428B2

公开(公告)日：2020-12-08

申请号：US16140991

申请日：2018-09-25

Applicant: Apple Inc.

Inventor： Stephan Henzler ,  Andreas Menkhoff ,  Thomas Eichler ,  Wolfgang Walthes ,  Alexander Belitzer ,  Yifan Wang

IPC: H03F1/30 ,  H03F1/02 ,  H03F3/19 ,  H03F3/21 ,  H02M3/07 ,  H03M1/66 ,  H03F3/189 ,  H03F3/24 ,  H03F3/68 ,  H02M3/158

Abstract: An envelope tracking system for controlling a power amplifier supply voltage includes envelope circuitry and a feed forward digital to analog converter (DAC) circuitry. The envelope circuitry is configured to generate a target envelope signal based on a selected power amplifier supply voltage. The feed forward DAC circuitry includes a voltage source circuitry and a selector circuitry. The voltage source circuitry is configured to generate a plurality of voltages. The selector circuitry is configured to select one of the plurality of voltages based at least on the target envelope signal. The feed forward DAC circuitry is configured to provide the selected voltage to a supply voltage input of a power amplifier that amplifies a radio frequency (RF) transmit signal.