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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
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.
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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
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.
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公开(公告)号：US20240248509A1
公开(公告)日：2024-07-25
申请号：US18156952
申请日：2023-01-19
Applicant: Apple Inc.
Inventor： Stephan Henzler , Alexander Klinkan
Abstract: A radio-frequency amplifier can have a radio-frequency input configured to receive a radio-frequency signal and a control input for receiving a control signal. The radio-frequency signal can be generated using a first group of digital-to-analog converters (DACs), whereas the control signal can be generated using a second set of DACs. Data intended for the first group of DACs can be fed through a first set of retiming circuits and a first crossbar circuit. Data intended for the second group of DACs can be fed through a second set of retiming circuits and a second crossbar circuit. A low skew clocking interface and constant latency control and clock domain cross circuits can be employed to ensure that data streams arriving at the first group of DACs are time aligned with data streams arriving at the second group of DACs.
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