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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
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.
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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
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.
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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
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.
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公开(公告)号：US20230034540A1
公开(公告)日：2023-02-02
申请号：US17964958
申请日：2022-10-13
Applicant: Apple Inc.
Inventor： Andreas Langer , Christoph Hepp , Andreas Menkhoff , Gunther Kraut
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.
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公开(公告)号：US20220229155A1
公开(公告)日：2022-07-21
申请号：US17150974
申请日：2021-01-15
Applicant: Apple Inc.
Inventor： Jochen Schrattenecker , Bernhard Sogl , Andreas Menkhoff , Joonhoi Hur , Harald Pretl , Christian Mayer , Andreas Langer , Rastislav Vazny
IPC: G01S7/40
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.
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Patent Agency Ranking
公开(公告)号：US20210006275A1
公开(公告)日：2021-01-07
申请号：US16761421
申请日：2017-11-23
Applicant: Apple Inc.
Inventor： Andreas Langer , Thomas Bruder
IPC: H04B1/04
Abstract: An apparatus for wireless communication is provided. The apparatus includes a processing circuit configured to receive data to be wirelessly transmitted within a predefined frequency range. Further, the processing circuit is configured to generate a first radio frequency transmit signal of a first frequency range based on the data, and to generate a second radio frequency transmit signal of a second frequency range based on the data. The first frequency range and the second frequency range are subranges of the predefined frequency range. The apparatus further includes a front-end circuit configured to supply the first radio frequency transmit signal to a first antenna, and to supply the second radio frequency transmit signal to a second antenna.
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公开(公告)号：US20250105792A1
公开(公告)日：2025-03-27
申请号：US18739614
申请日：2024-06-11
Applicant: Apple Inc.
Inventor： Stephan Henzler , Andreas Langer
Abstract: Wireless circuitry may include a radio-frequency amplifier configured to receive a power supply voltage, a load modulation circuit configured to generate a load control signal, and supply voltage error compensation circuitry configured to generate an error signal that is applied to the load control signal to produce a compensated load control signal. The compensated load control signal can be used to tune an adjustable load component of the radio-frequency amplifier. The power supply voltage may exhibit a piecewise constant waveform. The supply voltage error compensation circuitry can include a reference signal generator configured to generate a reference signal and a filter configured to generate a target signal based on the reference signal. The error signal can be computed based on a difference between the target signal and a sensed or estimated version of the power supply voltage received at the amplifier.
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公开(公告)号：US11121684B2
公开(公告)日：2021-09-14
申请号：US16765668
申请日：2017-12-15
Applicant: Apple Inc.
Inventor： Stephan Henzler , Andreas Langer , Otto Schumacher
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.
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公开(公告)号：US20200382147A1
公开(公告)日：2020-12-03
申请号：US16766416
申请日：2017-12-29
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.
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公开(公告)号：US12034409B2
公开(公告)日：2024-07-09
申请号：US18159604
申请日：2023-01-25
Applicant: Apple Inc.
Inventor： Stephan Henzler , Andreas Langer
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.
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