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公开(公告)号：US11756582B1
公开(公告)日：2023-09-12
申请号：US17742202
申请日：2022-05-11
发明人： Paolo Pulici , Dennis Hogg , Michele Bartolini , Enrico Sentieri , Enrico Mammei
CPC分类号： G11B5/6017 , G11B21/106
摘要： A system for determining a fly height includes a first head of a disk drive, a second head of the disk drive, a capacitive sensor circuit coupled to the first head and the second head, and a logic device coupled to the capacitive sensor circuit. The capacitive sensor circuit is configured to measure a first capacitance between the first head and the first disk, remove noise from the first capacitance using a second capacitance between the second head and the second disk, and based thereon determine a corrected first capacitance. The logic device is configured to determine the fly height between the first head and the first disk using the corrected first capacitance.
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公开(公告)号：US12052029B2
公开(公告)日：2024-07-30
申请号：US17690847
申请日：2022-03-09
发明人： Nicola Lupo , Enrico Mammei , Michele Bartolini , Stefano Colli
摘要： A method to drive a digital to analog converter (DAC), the method including setting a reference current for the DAC with a reference current source, a base voltage being responsive to changes in a reference voltage at a reference node coupled with the reference current source; sensing a change in the reference voltage; and adaptively steadying the base voltage based on the change in the reference voltage to maintain proportionality between an output current of the DAC and the reference current.
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公开(公告)号：US20240356561A1
公开(公告)日：2024-10-24
申请号：US18762215
申请日：2024-07-02
发明人： Nicola Lupo , Enrico Mammei , Michele Bartolini , Stefano Colli
摘要： A method to drive a digital to analog converter (DAC), the method including setting a reference current for the DAC with a reference current source, a base voltage being responsive to changes in a reference voltage at a reference node coupled with the reference current source; sensing a change in the reference voltage; and adaptively steadying the base voltage based on the change in the reference voltage to maintain proportionality between an output current of the DAC and the reference current.
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公开(公告)号：US20230291416A1
公开(公告)日：2023-09-14
申请号：US17690847
申请日：2022-03-09
发明人： Nicola Lupo , Enrico Mammei , Michele Bartolini , Stefano Colli
摘要： A method to drive a digital to analog converter (DAC), the method including setting a reference current for the DAC with a reference current source, a base voltage being responsive to changes in a reference voltage at a reference node coupled with the reference current source; sensing a change in the reference voltage; and adaptively steadying the base voltage based on the change in the reference voltage to maintain proportionality between an output current of the DAC and the reference current.
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公开(公告)号：US20230314117A1
公开(公告)日：2023-10-05
申请号：US18191689
申请日：2023-03-28
发明人： Dario Livornesi , Mattia Fausto Moretti , Paolo Pulici , Alessio Emanuele Vergani , Alessio Facen , Michele Bartolini , Roberto Faravelli , Francesco Piscitelli
摘要： According to an embodiment, a circuit includes a core and low-frequency recovery circuits. The core circuit is configured to bias a resistive sensor used to measure a fly height of a hard disk drive. The core circuit is additionally configured to amplify a high-frequency component of a sensing signal of the resistive sensor, the sensing signal indicating the fly height. The low-frequency recovery circuit is configured to amplify the sensing signal's low-frequency component.
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