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    Downshift techniques for oscillator with feedback loop
    12.
    发明授权
    Downshift techniques for oscillator with feedback loop 有权

    公开(公告)号：US10230379B2

    公开(公告)日：2019-03-12

    申请号：US15146374

    申请日：2016-05-04

    Applicant: Apple Inc.

    Inventor： Brian S. Leibowitz ,  Jared L. Zerbe ,  Sanjay Pant

    IPC: H03L7/093 ,  H03B1/00 ,  H03L7/08 ,  H03L7/085 ,  H03L7/099

    Abstract: Techniques are disclosed relating to rapidly downshifting the output frequency of an oscillator. In some embodiments, the oscillator is configured to operate in a closed-loop mode in which negative feedback is used to maintain a particular output frequency (e.g., in a phase-locked loop (PLL)). In some embodiments, the negative feedback loop is configured to maintain the output of the oscillator at a particular frequency based on a reference clock signal and the output of the oscillator. The nature of a negative feedback loop may render rapid frequency changes difficult, e.g., because of corrections by the loop. Therefore, in some embodiments, the loop is configured to switch to an open-loop mode in which a control input to the oscillator is fixed. In some embodiments, the loop switches to open-loop mode in response to a trigger signal and control circuitry forces the oscillator to a new target frequency.

    Detecting power supply noise events and initiating corrective action
    15.
    发明授权
    Detecting power supply noise events and initiating corrective action 有权

    公开(公告)号：US11736111B2

    公开(公告)日：2023-08-22

    申请号：US17455338

    申请日：2021-11-17

    Applicant: Apple Inc.

    Inventor： Jared L. Zerbe ,  Brian S. Leibowitz ,  Sanjay Pant

    IPC: H03L7/099 ,  H03L7/08 ,  H03L1/00

    CPC classification number: H03L7/099 ,  H03L1/00 ,  H03L7/0805

    Abstract: Techniques are disclosed relating to detecting supply voltage events and performing corrective actions. In some embodiments, an apparatus includes sensor circuitry and control circuitry. In some embodiments, the sensor circuitry is configured to monitor supply voltage from a power supply and detect a load release event that includes an increase in the supply voltage that meets one or more pre-determined threshold parameters. In some embodiments, the control circuitry is configured to increase clock cycle time for operations performed by circuitry powered by the supply voltage during a time interval, wherein the time interval corresponds to ringing of the supply voltage that reduces the supply voltage and results from the load release event. In some embodiments, the disclosed techniques may reduce transients in supply voltage (which may avoid equipment damage and computing errors) and may allow for reduced voltage margins (which may reduce overall power consumption).

    Downshift Techniques for Oscillator with Feedback Loop
    17.
    发明申请
    Downshift Techniques for Oscillator with Feedback Loop 审中-公开

    公开(公告)号：US20200287555A1

    公开(公告)日：2020-09-10

    申请号：US16851821

    申请日：2020-04-17

    Applicant: Apple Inc.

    Inventor： Brian S. Leibowitz ,  Jared L. Zerbe ,  Sanjay Pant

    IPC: H03L7/093 ,  H03B1/00 ,  H03L7/08 ,  H03L7/085 ,  H03L7/099

    Abstract: Techniques are disclosed relating to rapidly downshifting the output frequency of an oscillator. In some embodiments, the oscillator is configured to operate in a closed-loop mode in which negative feedback is used to maintain a particular output frequency (e.g., in a phase-locked loop (PLL)). In some embodiments, the negative feedback loop is configured to maintain the output of the oscillator at a particular frequency based on a reference clock signal and the output of the oscillator. The nature of a negative feedback loop may render rapid frequency changes difficult, e.g., because of corrections by the loop. Therefore, in some embodiments, the loop is configured to switch to an open-loop mode in which a control input to the oscillator is fixed. In some embodiments, the loop switches to open-loop mode in response to a trigger signal and control circuitry forces the oscillator to a new target frequency.

    Detecting Power Supply Noise Events and Initiating Corrective Action
    20.
    发明申请
    Detecting Power Supply Noise Events and Initiating Corrective Action 有权

    公开(公告)号：US20220140833A1

    公开(公告)日：2022-05-05

    申请号：US17455338

    申请日：2021-11-17

    Applicant: Apple Inc.

    Inventor： Jared L. Zerbe ,  Brian S. Leibowitz ,  Sanjay Pant

    IPC: H03L7/099 ,  H03L7/08 ,  H03L1/00

    Abstract: Techniques are disclosed relating to detecting supply voltage events and performing corrective actions. In some embodiments, an apparatus includes sensor circuitry and control circuitry. In some embodiments, the sensor circuitry is configured to monitor supply voltage from a power supply and detect a load release event that includes an increase in the supply voltage that meets one or more pre-determined threshold parameters. In some embodiments, the control circuitry is configured to increase clock cycle time for operations performed by circuitry powered by the supply voltage during a time interval, wherein the time interval corresponds to ringing of the supply voltage that reduces the supply voltage and results from the load release event. In some embodiments, the disclosed techniques may reduce transients in supply voltage (which may avoid equipment damage and computing errors) and may allow for reduced voltage margins (which may reduce overall power consumption).

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