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    CARRIER MODULATION RANGING USING SPADS
    1.
    发明公开
    CARRIER MODULATION RANGING USING SPADS 审中-公开

    公开(公告)号：US20240077592A1

    公开(公告)日：2024-03-07

    申请号：US17939471

    申请日：2022-09-07

    Applicant: STMicroelectronics (Research & Development) Limited

    Inventor： John Kevin Moore

    IPC: G01S7/4861 ,  G01S7/4865 ,  G01S17/10

    CPC classification number: G01S7/4861 ,  G01S7/4865 ,  G01S17/10

    Abstract: An optical ranging system includes: a first phase-locked loop (PLL) configured to generate a first frequency signal and a second frequency signal; a second PLL configured to generate a third frequency signal based on a control signal that is formed using the first frequency signal; an optical source coupled to the second PLL, where an intensity of an optical signal emitted by the optical source is configured to be modulated in accordance with the third frequency signal; a first single-photon avalanche diode (SPAD) configured to receive a reflected optical signal; a time-to-digital converter (TDC) coupled to the first SPAD, where the TDC is configured to generate digital samples by sampling an output signal of the first SPAD under control of the second frequency signal; a reference signal generator configured to generate a reference signal; and a mixer configured to mix the reference signal and the digital samples from the TDC.

    Time to digital converter
    2.
    发明授权
    Time to digital converter 有权

    公开(公告)号：US11885915B2

    公开(公告)日：2024-01-30

    申请号：US16834347

    申请日：2020-03-30

    Applicant: STMicroelectronics (Research & Development) Limited

    Inventor： Neale Dutton ,  John Kevin Moore

    IPC: G01S7/4865 ,  G01S17/10 ,  G01S17/89

    CPC classification number: G01S7/4865 ,  G01S17/10 ,  G01S17/89

    Abstract: In an embodiment, a method includes: receiving a first plurality of digital codes from a time-to-digital converter (TDC); TDC; generating a coarse histogram from the first plurality of digital codes; detecting a peak coarse bin from the plurality of coarse bins; after receiving the first plurality of digital codes, receiving a second plurality of digital codes from the TDC; and generating a fine histogram from the second plurality of digital codes based on the detected peak coarse bin, where a fine histogram depth range is narrower than a coarse histogram depth range, where a lowest fine histogram depth is lower or equal to a lowest coarse peak depth, and where a highest fine histogram depth is higher or equal to a highest coarse peak depth.

    Photodiode including an additional depletion region for sensitivity control and method of creating the same
    3.
    发明授权
    Photodiode including an additional depletion region for sensitivity control and method of creating the same 有权

    公开(公告)号：US11251317B2

    公开(公告)日：2022-02-15

    申请号：US16841412

    申请日：2020-04-06

    Applicant: STMICROELECTRONICS (RESEARCH & DEVELOPMENT) LIMITED

    Inventor： John Kevin Moore

    IPC: H01L31/02 ,  G01J1/44 ,  H01L31/107

    Abstract: The present disclosure is directed to a diode including a first doped structure, doped with a first type of material and forming at least part of an isolation structure for the diode; at least one contact structure located within the first doped structure, the at least one contact structure forming one of the cathode or anode of the diode; a second doped structure, doped with a second type of material, and forming at least one depletion region or PN junction with the first doped structure; at least one second contact structure located within the second doped structure, the at least one second contact structure forming the other of the anode or the cathode of the diode; at least one further contact structure, doped with the first type of material, the at least one further contact structure forming at least one further depletion region or further PN junction, such that the at least one further depletion region is configured to steer charge from the at least one depletion region and thus decrease the sensitivity of the diode.

    PROXIMITY SENSOR AND METHOD OF OPERATING A PHOTODETECTOR BASED PROXIMITY SENSOR
    4.
    发明申请
    PROXIMITY SENSOR AND METHOD OF OPERATING A PHOTODETECTOR BASED PROXIMITY SENSOR 审中-公开

    公开(公告)号：US20200052694A1

    公开(公告)日：2020-02-13

    申请号：US16535369

    申请日：2019-08-08

    Applicant: STMicroelectronics (Research & Development) Limited

    Inventor： John Kevin Moore

    IPC: H03K17/94 ,  H03K17/945 ,  H01L31/0232 ,  H01L31/12

    Abstract: An apparatus can be used for detecting pile-up within circuitry associated with photodetectors. The apparatus includes an input terminal configured to receive a plurality of photodetector outputs. An OR-tree is coupled in parallel with the circuitry associated with the photodetectors. The OR-tree has an input coupled to the input terminal and is configured to combine the photodetector outputs. A counter is configured to count an output of the OR-tree. A comparator is configured to compare an output of the counter to a determined threshold value, wherein the comparator is configured to output an indicator indicating pile-up within the circuitry associated with photodetectors based on the output of the counter being greater than or equal to the determined threshold value.

    TIME TO DIGITAL CONVERTER
    9.
    发明公开
    TIME TO DIGITAL CONVERTER 审中-公开

    公开(公告)号：US20240118397A1

    公开(公告)日：2024-04-11

    申请号：US18390534

    申请日：2023-12-20

    Applicant: STMicroelectronics (Research & Development) Limited

    Inventor： Neale Dutton ,  John Kevin Moore

    IPC: G01S7/4865 ,  G01S17/10 ,  G01S17/89

    CPC classification number: G01S7/4865 ,  G01S17/10 ,  G01S17/89

    Abstract: In an embodiment, a method includes: receiving a first plurality of digital codes from a TDC; generating a coarse histogram from the first plurality of digital codes; detecting a peak coarse bin from the plurality of coarse bins; after receiving the first plurality of digital codes, receiving a second plurality of digital codes from the TDC; and generating a fine histogram from the second plurality of digital codes based on the detected peak coarse bin, where a fine histogram depth range is narrower than a coarse histogram depth range, where a lower fine histogram depth is lower or equal to a lower coarse peak depth, and where a higher fine histogram depth is higher or equal to a higher coarse peak depth.

    Voltage controlled steered VCSEL driver
    10.
    发明授权
    Voltage controlled steered VCSEL driver 有权

    公开(公告)号：US11728621B2

    公开(公告)日：2023-08-15

    申请号：US16891936

    申请日：2020-06-03

    Applicant: STMicroelectronics (Research & Development) Limited

    Inventor： John Kevin Moore

    IPC: H01S5/042 ,  H01S5/068 ,  H01S5/42

    CPC classification number: H01S5/0427 ,  H01S5/06808 ,  H01S5/423

    Abstract: An electronic device includes laser emitters, and a laser driver generating a laser drive signal for the laser emitters based upon a feedback control signal. A steering circuit selectively steers the laser drive signal to a different selected one of the plurality of laser emitters and prevents the laser drive signal from being steered to non-selected ones of the plurality of laser emitters, during each of a plurality of time periods. Control circuitry senses a magnitude of a current of the laser drive signal and generates the feedback control signal based thereupon. The feedback control signal is generated so as to cause the laser driver to generate the laser drive signal as having a current with a substantially constant magnitude.

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