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公开(公告)号：US10511323B1
公开(公告)日：2019-12-17
申请号：US16143447
申请日：2018-09-26
Applicant: Apple Inc.
Inventor： Tao Mai , Simone Gambini
Abstract: An Nth-order loop filter includes N integrators (where N is an integer value). The loop filter includes an initialization path coupled between an input to the loop filter and an input of at least one of the integrators. A control circuit is coupled to the Nth order filter. During a reset phase, the control circuit causes an initialization voltage to be sampled into a capacitance of the initialization path. During an initialization phase immediately following the reset phase, the control circuit causes the initialization voltage to be conveyed to the input(s) of the at least one integrator.
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公开(公告)号：US20250105807A1
公开(公告)日：2025-03-27
申请号：US18373093
申请日：2023-09-26
Applicant: Apple Inc.
Inventor： Long Kong , Simone Gambini
Abstract: Embodiments herein provide various apparatuses and techniques to reduce flicker noise and voltage offset from the buffers and/or amplifiers while avoiding additional alias components in a sampled-data receiver with chopper stabilization. Additionally, a direct-conversion baseband chain may be improved by disposing alternating current (AC) coupling circuits between chopper circuits in the transmitter or receiver chain to enable selection of a distinct common-mode level at each stage of the direct-conversion chain, while reducing or eliminating signal loss at direct current (DC) frequencies.
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Patent Agency Ranking
公开(公告)号：US20230082519A1
公开(公告)日：2023-03-16
申请号：US17750909
申请日：2022-05-23
Applicant: Apple Inc.
Inventor： Long Kong , Simone Gambini , Utku Seckin
Abstract: An electronic device may include wireless circuitry with processor circuitry, a transceiver circuit, a front-end module, and an antenna. The front-end module may include amplifier circuitry such as low noise amplifier circuitry for amplifying received radio-frequency signals. The amplifier circuitry may include an amplifier having an input and an output, an adjustable load component coupled to the input, and an adjustable feedback component coupled across the input and output. A control circuit may simultaneously adjust the load and feedback components to tune the gain of the amplifier circuitry while maintaining the input resistance at a desired target level. The load and feedback components can be the same or different types of adjustable passive components.
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公开(公告)号：US11139817B1
公开(公告)日：2021-10-05
申请号：US16855828
申请日：2020-04-22
Applicant: Apple Inc.
Inventor： Long Kong , Simone Gambini , Cristian Marcu , Nachum M. Kanovsky
Abstract: A computer system may periodically calibrate an oscillator subsystem, which includes a voltage-controlled oscillator circuit configured to generate an oscillator signal using code signal. In response to activation of a calibration mode, an iterative calibration operation may be performed on the voltage-controlled oscillator circuit. In some cases, performing a given iteration of the calibration operation includes determining a value of the code signal using a number of pulses in the oscillator signal sampled during a particular time period, along with previous values of the code signal and a slope of an error function associated with the difference between a desired frequency and a current frequency of the oscillator signal. In other cases, iterations may employ variable sampling times with error handling, in order to decrease the duration of the calibration operation while maintaining a target accuracy.
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公开(公告)号：US11128328B2
公开(公告)日：2021-09-21
申请号：US16945508
申请日：2020-07-31
Applicant: Apple Inc.
Inventor： Simone Gambini
Abstract: A sensor circuit included in a computer system may include multiple antennas, a control circuit, a mixer circuit, a transmitter circuit and a filter circuit. The control circuit may generate a baseband signal, which the mixer circuit may modulate using a modulation signal to generate a transmit signal. The transmitter circuit may transmit the transmit signal using a first antenna. The filter circuit may be configured to track a carrier frequency of the transmit signal and filter a reflected version of the transmit signal to generate an output signal.
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公开(公告)号：US20210028803A1
公开(公告)日：2021-01-28
申请号：US16945508
申请日：2020-07-31
Applicant: Apple Inc.
Inventor： Simone Gambini
Abstract: A sensor circuit included in a computer system may include multiple antennas, a control circuit, a mixer circuit, a transmitter circuit and a filter circuit. The control circuit may generate a baseband signal, which the mixer circuit may modulate using a modulation signal to generate a transmit signal. The transmitter circuit may transmit the transmit signal using a first antenna. The filter circuit may be configured to track a carrier frequency of the transmit signal and filter a reflected version of the transmit signal to generate an output signal.
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公开(公告)号：US10581447B1
公开(公告)日：2020-03-03
申请号：US16147531
申请日：2018-09-28
Applicant: Apple Inc.
Inventor： Simone Gambini , Robert G. Lorenz
Abstract: A method and apparatus for measuring phase response in a radio receiver is disclosed. A radio receiver includes a digital-to-analog (D/A) conversion unit coupled to receive a test signal. The D/A conversion unit includes a number of single-bit digital-to-analog conversion (DAC) circuits coupled to receive the test signal and configured to convert it into the analog domain. Clock signals received by each of the single-bit DAC circuits are out of phase with respect to one another. The output of the D/A conversion unit is an analog signal that is a composite of the signals output by the DAC circuits therein. The analog signal is then conveyed to an analog-to-digital converter (ADC) and converted into an N-bit digital signal. The N-bit digital signal is then conveyed to a correlator to determine a phase response of the radio receiver.
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