公开(公告)号：US12073860B2

公开(公告)日：2024-08-27

申请号：US18191639

申请日：2023-03-28

申请人： STMicroelectronics S.r.l.

发明人： Dario Livornesi ,  Alessio Emanuele Vergani ,  Paolo Pulici ,  Francesco Piscitelli ,  Enrico Mammei ,  Mojtaba Mohammadi Abdevand ,  Piero Malcovati ,  Edoardo Bonizzoni

IPC分类号： G11B5/60 ,  H03F1/02

CPC分类号： G11B5/6029 ,  G11B5/607 ,  H03F1/0261

摘要： 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.

公开(公告)号：US20230314117A1

公开(公告)日：2023-10-05

申请号：US18191689

申请日：2023-03-28

申请人： STMicroelectronics S.r.l.

发明人： Dario Livornesi ,  Mattia Fausto Moretti ,  Paolo Pulici ,  Alessio Emanuele Vergani ,  Alessio Facen ,  Michele Bartolini ,  Roberto Faravelli ,  Francesco Piscitelli

IPC分类号： G01B7/14 ,  H03F3/16 ,  G11B27/36

CPC分类号： G01B7/14 ,  H03F3/16 ,  G11B27/36

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.

公开(公告)号：US20230386514A1

公开(公告)日：2023-11-30

申请号：US18191639

申请日：2023-03-28

申请人： STMicroelectronics S.r.l.

发明人： Dario Livornesi ,  Alessio Emanuele Vergani ,  Paolo Pulici ,  Francesco Piscitelli ,  Enrico Mammei ,  Mojtaba Mohammadi Abdevand ,  Piero Malcovati ,  Edoardo Bonizzoni

IPC分类号： G11B5/60 ,  H03F1/02

CPC分类号： G11B5/6029 ,  G11B5/607 ,  H03F1/0261

摘要： 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.