公开(公告)号：US20240089876A1

公开(公告)日：2024-03-14

申请号：US17943400

申请日：2022-09-13

Applicant: Apple Inc.

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

IPC: H04W52/52 ,  H03G3/30 ,  H04W52/36

CPC classification number: H04W52/52 ,  H03G3/3042 ,  H04W52/36

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 signal generator.

公开(公告)号：US20240088924A1

公开(公告)日：2024-03-14

申请号：US17941905

申请日：2022-09-09

Applicant: Apple Inc.

Inventor： Stephan Henzler ,  Nicholas Preyss ,  Jochen Schrattenecker ,  Andreas Langer ,  Alexander Klinkan ,  Christoph Hepp ,  Christoph Angerer

IPC: H04B1/04 ,  H04L5/00 ,  H04W56/00

CPC classification number: H04B1/0458 ,  H04L5/0048 ,  H04W56/005 ,  H04B2001/0408

Abstract: Wireless circuitry can include a processor that generates a baseband signal, an upconversion circuit that upconverts the baseband signals to a radio-frequency signal, and an amplifier that amplifies the radio-frequency signal. A tunable delay circuit can be used to selectively delay generation of the radio-frequency signal or to delay generation of another signal intended for the radio-frequency amplifier. The tunable delay circuit can be controlled using a closed-loop delay adaptation scheme. A feedback receiver that is coupled to an output of the amplifier can be used to generate a demodulated signal. A delay error measurement circuit can be used to receive the demodulated signal, to detect a peak by monitoring when an envelope of the demodulated signal crosses a threshold level, to compute an amount of asymmetry in the detected peak, and to output a signal that is used to control the tunable delay circuit.

公开(公告)号：US11817892B2

公开(公告)日：2023-11-14

申请号：US17964958

申请日：2022-10-13

Applicant: Apple Inc.

Inventor： Andreas Langer ,  Christoph Hepp ,  Andreas Menkhoff ,  Gunther Kraut

IPC: H04B1/04 ,  H03F1/32 ,  H03F3/24

CPC classification number: H04B1/0475 ,  H03F1/3247 ,  H03F3/245 ,  H03F2200/102 ,  H03F2200/451 ,  H03F2201/3231 ,  H04B2001/0425

Abstract: Systems, circuitries, and methods for predistorting a digital signal in a transmit chain based on a predistortion function are provided. A method includes shifting a center frequency of an input signal by an offset to generate an adapted signal; predistorting the adapted signal based on a predistortion function to generate a predistorted adapted signal; reverting the shifting of the center frequency of the predistorted adapted signal by the offset to generate a predistorted signal; and causing transmission of the predistorted signal by a transmit chain.

公开(公告)号：US11102729B2

公开(公告)日：2021-08-24

申请号：US15736416

申请日：2016-05-23

Applicant: Apple Inc.

Inventor： Andreas Langer ,  Thomas Bruder

IPC: H04W52/24 ,  H04W52/08 ,  H04W52/10 ,  H04W52/42 ,  H04W52/52

Abstract: A data transmission system may comprise a first transmission chain comprising a first transmission power controller, the first transmission power controller being configured to operate in an open loop power control mode or in a closed loop power control mode; a second transmission chain; and a power control mode selector configured to select the first transmission power controller to operate in the open loop power control mode or in the closed loop power control mode based on at least one quantity indicative of interference induced by the second transmission chain in the first transmission power controller when operating in the closed loop power control mode.

公开(公告)号：US12176934B2

公开(公告)日：2024-12-24

申请号：US17862619

申请日：2022-07-12

Applicant: Apple Inc.

Inventor： Andreas Menkhoff ,  Gunther Kraut ,  Andreas Langer

IPC: H04B1/04

Abstract: A predistortion circuit for a wireless transmitter includes a signal input configured to receive a baseband signal. Further, the predistortion circuit includes a predistorter configured to generate a predistorted baseband signal using the baseband signal and a select of one of a first predistorter configuration and a second predistorter configuration.

公开(公告)号：US20240036165A1

公开(公告)日：2024-02-01

申请号：US18484308

申请日：2023-10-10

Applicant: Apple Inc.

Inventor： Jochen Schrattenecker ,  Bernhard Sogl ,  Andreas Menkhoff ,  Joonhoi Hur ,  Harald Pretl ,  Christian Mayer ,  Andreas Langer ,  Rastislav Vazny

IPC: G01S7/40

CPC classification number: G01S7/4056 ,  G01S7/40 ,  G01S7/4073

Abstract: An electronic device may include radar circuitry. Control circuitry may calibrate the radar circuitry using a multi-tone calibration signal. A first mixer may upconvert the calibration signal for transmission by a transmit antenna. A de-chirp mixer may mix the calibration signal output by the first mixer with the calibration signal as received by a receive antenna or loopback path to produce a baseband multi-tone calibration signal. The baseband signal will be offset from DC by the frequency gap. This may prevent DC noise or other system effects from interfering with the calibration signal. The control circuitry may sweep the first mixer over the radio frequencies of operation of the radar circuitry to estimate the power droop and phase shift of the radar circuitry based on baseband calibration signal. Distortion circuitry may distort transmit signals used in spatial ranging operations to invert the estimated power droop and phase shift.

公开(公告)号：US20230353098A1

公开(公告)日：2023-11-02

申请号：US18159604

申请日：2023-01-25

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：US20220368360A1

公开(公告)日：2022-11-17

申请号：US17862619

申请日：2022-07-12

Applicant: Apple Inc.

Inventor： Andreas Menkhoff ,  Gunther Kraut ,  Andreas Langer

IPC: H04B1/04

Abstract: A predistortion circuit for a wireless transmitter includes a signal input configured to receive a baseband signal. Further, the predistortion circuit includes a predistorter configured to generate a predistorted baseband signal using the baseband signal and a select of one of a first predistorter configuration and a second predistorter configuration.

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：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.