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公开(公告)号：US11720128B2
公开(公告)日：2023-08-08
申请号：US17362532
申请日：2021-06-29
Applicant: STMicroelectronics S.r.l.
Inventor： Enrico Mammei , Francesco Ravelli , Edoardo Contini , Paolo Pulici
Abstract: In an embodiment, a linear voltage regulator includes: an output transistor having a first current path terminal configured to be coupled to a load, and a second current path terminal coupled to a first supply terminal, where the output transistor is configured to provide, at the first current path terminal, a regulated output voltage; a voltage source circuit configured to provide, in an open loop manner, a first voltage to a control terminal of the output transistor; and a feedback loop coupled between the first current path terminal of the output transistor and the control terminal of the output transistor, the feedback loop including a sense transistor having a first current path terminal coupled to the first current path terminal of the output transistor.
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公开(公告)号：US12073860B2
公开(公告)日：2024-08-27
申请号：US18191639
申请日：2023-03-28
Applicant: STMicroelectronics S.r.l.
Inventor： Dario Livornesi , Alessio Emanuele Vergani , Paolo Pulici , Francesco Piscitelli , Enrico Mammei , Mojtaba Mohammadi Abdevand , Piero Malcovati , Edoardo Bonizzoni
CPC classification number: G11B5/6029 , G11B5/607 , H03F1/0261
Abstract: According to an embodiment, a circuit includes a biasing and a low-frequency recovery circuit. The biasing circuit includes a voltage digital to analog converter (V-DAC), a differential difference amplifier coupled to the V-DAC, a common-mode feedback (CMFB) amplifier coupled to the differential difference amplifier, and a first pair of transistors arranged as a high-impedance structure and coupled to the differential difference amplifier and the CMFB amplifier. The low-frequency recovery circuit includes a current digital to analog converter (C-DAC), a second pair of transistors arranged as a high-impedance structure and coupled to the first pair of transistors, a pair of resistors having a resistance value equal to half a resistance of the resistive sensor, the pair of resistors arranged between the second pair of transistors and coupled to the C-DAC, and a gain circuit coupled to shared nodes between the second pair of transistors and the pair of resistors.
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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
Applicant: STMicroelectronics, Inc. , STMicroelectronics S.r.l.
Inventor： Paolo Pulici , Dennis Hogg , Michele Bartolini , Enrico Sentieri , Enrico Mammei
CPC classification number: G11B5/6017 , G11B21/106
Abstract: 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
Applicant: STMicroelectronics S.r.l.
Inventor： Nicola Lupo , Enrico Mammei , Michele Bartolini , Stefano Colli
Abstract: 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：US20240177732A1
公开(公告)日：2024-05-30
申请号：US18432776
申请日：2024-02-05
Applicant: STMicroelectronics S.r.l.
Inventor： Marco Mazzini , Marco Ciuffolini , Enrico Mammei , Paolo Pulici
CPC classification number: G11B5/012 , G05F1/56 , H05B3/22 , G11B2005/0021
Abstract: In accordance with an embodiment, a circuit is configured to vary an intensity of a drive current of a resistive heater element based on the digital control signal. The circuit includes and output circuit configured to control a respective slew rate and an electric energy dissipated in the resistive heater element independently of a resistance value of the resistive heater element.
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Patent Agency Ranking
公开(公告)号：US11855588B2
公开(公告)日：2023-12-26
申请号：US17581334
申请日：2022-01-21
Applicant: STMicroelectronics S.r.l.
Inventor： Edoardo Marino , Alessio Vallese , Alessio Facen , Enrico Mammei , Paolo Pulici
CPC classification number: H03F1/3211 , H03F3/45179 , H03F3/45479 , H03F3/4508 , H03F3/45085
Abstract: In an embodiment, an electronic circuit includes: an input differential pair including first and second transistors; a first pair of transistors in emitter-follower configuration including third and fourth transistors, and an output differential pair including fifth and sixth transistors. The third transistor has a control terminal coupled to the first transistor, and a current path coupled to a first output terminal. The fourth transistor has a control terminal coupled to the second transistor, and a current path coupled to a second output terminal. The fifth transistor has a control terminal coupled to the first transistor, and a first current path terminal coupled to the first output terminal. The sixth transistor has a control terminal coupled to the second transistor, and a first current path terminal coupled to the second output terminal. First and second termination resistors are coupled between the first pair of transistors and the output differential pair.
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公开(公告)号：US20230238921A1
公开(公告)日：2023-07-27
申请号：US17581334
申请日：2022-01-21
Applicant: STMicroelectronics S.r.l
Inventor： Edoardo Marino , Alessio Vallese , Alessio Facen , Enrico Mammei , Paolo Pulici
CPC classification number: H03F1/3211 , H03F3/45179 , H03F3/45479 , H03F3/4508
Abstract: In an embodiment, an electronic circuit includes: an input differential pair including first and second transistors; a first pair of transistors in emitter-follower configuration including third and fourth transistors, and an output differential pair including fifth and sixth transistors. The third transistor has a control terminal coupled to the first transistor, and a current path coupled to a first output terminal. The fourth transistor has a control terminal coupled to the second transistor, and a current path coupled to a second output terminal. The fifth transistor has a control terminal coupled to the first transistor, and a first current path terminal coupled to the first output terminal. The sixth transistor has a control terminal coupled to the second transistor, and a first current path terminal coupled to the second output terminal. First and second termination resistors are coupled between the first pair of transistors and the output differential pair.
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公开(公告)号：US11657846B1
公开(公告)日：2023-05-23
申请号：US17710608
申请日：2022-03-31
Applicant: STMicroelectronics S.r.l. , STMicroelectronics, Inc.
Inventor： Enrico Mammei , Paolo Sanna , Dennis Hogg , Edoardo Contini
IPC: G11B20/10
CPC classification number: G11B20/10027
Abstract: A method to determine a relative delay between a current-overshoot signal and a write data signal for a hard disk drive preamplifier, the method including using a memory element to strobe a test current-overshoot signal with a test data signal; counting a number of strobed transitions of the test current-overshoot signal; adjusting the delay based on the number of strobed transitions; setting a phase difference between the current-overshoot signal and the write data signal according to the delay; and using the memory element to strobe the current-overshoot signal with the write data signal.
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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
Applicant: STMicroelectronics S.r.l.
Inventor： Nicola Lupo , Enrico Mammei , Michele Bartolini , Stefano Colli
Abstract: 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：US20230386514A1
公开(公告)日：2023-11-30
申请号：US18191639
申请日：2023-03-28
Applicant: STMicroelectronics S.r.l.
Inventor： Dario Livornesi , Alessio Emanuele Vergani , Paolo Pulici , Francesco Piscitelli , Enrico Mammei , Mojtaba Mohammadi Abdevand , Piero Malcovati , Edoardo Bonizzoni
CPC classification number: G11B5/6029 , G11B5/607 , H03F1/0261
Abstract: According to an embodiment, a circuit includes a biasing and a low-frequency recovery circuit. The biasing circuit includes a voltage digital to analog converter (V-DAC), a differential difference amplifier coupled to the V-DAC, a common-mode feedback (CMFB) amplifier coupled to the differential difference amplifier, and a first pair of transistors arranged as a high-impedance structure and coupled to the differential difference amplifier and the CMFB amplifier. The low-frequency recovery circuit includes a current digital to analog converter (C-DAC), a second pair of transistors arranged as a high-impedance structure and coupled to the first pair of transistors, a pair of resistors having a resistance value equal to half a resistance of the resistive sensor, the pair of resistors arranged between the second pair of transistors and coupled to the C-DAC, and a gain circuit coupled to shared nodes between the second pair of transistors and the pair of resistors.
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