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公开(公告)号：US12184294B2
公开(公告)日：2024-12-31
申请号：US17872993
申请日：2022-07-25
Applicant: Apple Inc.
Inventor： Antonio Passamani , Timo W Gossmann , Adrien F Vargas , Guillaume Gourlat
Abstract: The present disclosure relates to power management for digital-to-analog converters (DACs). As electronic devices and the components therein become increasingly smaller to satisfy the desire for more compact/portable devices, the operating voltage may be reduced to reduce the likelihood of shorts and/or voltage/current bleeds. To maintain comparable power output with the reduced operating voltage, the current may increase proportionally to the decrease in voltage. Consequently, in scaled devices and applications, high-current low-voltage regulators may be beneficial. As such, a low-dropout regulator (LDO) including one or more operational amplifiers and multiple pass devices may be implemented between a power supply and the DAC to regulate the power supply to the DAC. Moreover, the LDO may include one or more feedback loops to maintain a desired voltage regulation of the pass devices.
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公开(公告)号：US20240103550A1
公开(公告)日：2024-03-28
申请号：US18102643
申请日：2023-01-27
Applicant: Apple Inc.
Inventor： Guillaume Gourlat , Mina Mofreh Gad Elsayed Abdallah , Adrien F Vargas
Abstract: A fast loop amplifier provides low-dropout (LDO) regulation for a frequency range. In one embodiment, the fast loop amplifier may include a two-stage amplifier that decouples gain from bandwidth. In another embodiment, the LDO regulator may include an alternating current coupling capacitor having increased capacitance (e.g., twice that of a load capacitance) and adding one or more gate blocking capacitors. The load capacitance may include a sum of a capacitance of the one or more gate blocking capacitors and parasitic capacitances of the fast loop amplifier. The AC coupling capacitor and the one or more gate blocking capacitors may improve base open-loop power supply rejection ratio and load regulation. In yet another embodiment, bias generation circuitry of the fast loop amplifier may include an amplifier coupled to the fast loop amplifier that reduces gain variations across process, voltage, and/or temperature, and maintains current density with respect to gain programing.
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公开(公告)号：US20250023574A1
公开(公告)日：2025-01-16
申请号：US18904845
申请日：2024-10-02
Applicant: Apple Inc.
Inventor： Antonio Passamani , Timo W Gossmann , Adrien F Vargas , Guillaume Gourlat
Abstract: The present disclosure relates to power management for digital-to-analog converters (DACs). As electronic devices and the components therein become increasingly smaller to satisfy the desire for more compact/portable devices, the operating voltage may be reduced to reduce the likelihood of shorts and/or voltage/current bleeds. To maintain comparable power output with the reduced operating voltage, the current may increase proportionally to the decrease in voltage. Consequently, in scaled devices and applications, high-current low-voltage regulators may be beneficial. As such, a low-dropout regulator (LDO) including one or more operational amplifiers and multiple pass devices may be implemented between a power supply and the DAC to regulate the power supply to the DAC. Moreover, the LDO may include one or more feedback loops to maintain a desired voltage regulation of the pass devices.
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公开(公告)号：US20240028060A1
公开(公告)日：2024-01-25
申请号：US17872993
申请日：2022-07-25
Applicant: Apple Inc.
Inventor： Antonio Passamani , Timo W Gossmann , Adrien F Vargas , Guillaume Gourlat
CPC classification number: G05F1/468 , H03M1/66 , G05F1/561 , G05F1/575 , H03F3/45071
Abstract: The present disclosure relates to power management for digital-to-analog converters (DACs). As electronic devices and the components therein become increasingly smaller to satisfy the desire for more compact/portable devices, the operating voltage may be reduced to reduce the likelihood of shorts and/or voltage/current bleeds. To maintain comparable power output with the reduced operating voltage, the current may increase proportionally to the decrease in voltage. Consequently, in scaled devices and applications, high-current low-voltage regulators may be beneficial. As such, a low-dropout regulator (LDO) including one or more operational amplifiers and multiple pass devices may be implemented between a power supply and the DAC to regulate the power supply to the DAC. Moreover, the LDO may include one or more feedback loops to maintain a desired voltage regulation of the pass devices.
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