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    Routing for DTOF sensors
    51.
    发明授权
    Routing for DTOF sensors 有权

    公开(公告)号：US11428792B2

    公开(公告)日：2022-08-30

    申请号：US16895477

    申请日：2020-06-08

    Applicant: STMicroelectronics (Research & Development) Limited

    Inventor： Neale Dutton ,  John Kevin Moore

    IPC: G01S17/88 ,  G01S7/4863 ,  G01S17/89

    Abstract: A ToF sensor includes an array of pixels having first and second subsets of pixels, first and second pluralities of TDCs, a routing bus having first and second pluralities of bus drivers, and a controller configured to: when the first subset of pixels is active and the second subset of pixels is not active, control the first plurality of bus drivers to route events from half of the pixels of the first subset to the first plurality of TDCs and control the first and second pluralities of bus drivers to route events from the other half of the pixels of the first subset to the second plurality of TDCs, and when the first subset of pixels is not active and the second subset of pixels is active, control the first plurality of bus drivers to route events from the second subset of pixels to the first plurality of TDCs.

    TIME TO DIGITAL CONVERTER
    54.
    发明申请
    TIME TO DIGITAL CONVERTER 有权

    公开(公告)号：US20210302550A1

    公开(公告)日：2021-09-30

    申请号：US16834347

    申请日：2020-03-30

    Applicant: STMicroelectronics (Research & Development) Limited

    Inventor： Neale Dutton ,  John Kevin Moore

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

    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.

    APPARATUS FOR CONTROLLING DRIVER CURRENT FOR ILLUMINATION SOURCE
    56.
    发明申请
    APPARATUS FOR CONTROLLING DRIVER CURRENT FOR ILLUMINATION SOURCE 有权

    公开(公告)号：US20210134943A1

    公开(公告)日：2021-05-06

    申请号：US17143840

    申请日：2021-01-07

    Applicant: STMICROELECTRONICS (RESEARCH & DEVELOPMENT) LIMITED

    Inventor： John Kevin Moore ,  Caixin Zhuang

    IPC: H01L29/06 ,  G01S17/10 ,  G01S7/497 ,  H05B45/00 ,  H05B47/18 ,  G01S7/4863 ,  G09G3/3216 ,  G09G3/3283 ,  H01L31/02 ,  H01L31/107

    Abstract: A single photon avalanche diode based range detecting apparatus includes a reference array of single photon avalanche diodes configured to receive light from an illumination source via an internally coupled path. A return array of single photon avalanche diodes is configured to receive light from the illumination source via an external free space path. A calibration pulse generator is configured to generate a calibration signal pulse. Readout circuitry is configured to receive an output of the reference array via a reference signal path, an output of the return array via a return signal path, and an output of the calibration pulse generator via a calibration signal path. The readout circuitry is configured to determine a delay difference value between the reference signal path and the return signal path based on the output of the calibration pulse generator via the calibration signal path.

    Charge pump overload detection
    58.
    发明授权
    Charge pump overload detection 有权

    公开(公告)号：US10545193B2

    公开(公告)日：2020-01-28

    申请号：US15209110

    申请日：2016-07-13

    Applicant: STMicroelectronics (Research & Development) Limited

    Inventor： John Kevin Moore

    IPC: G01R31/40 ,  H02M3/07 ,  G01R19/165

    Abstract: One or more embodiments are directed to charge pump overload detection circuits which may be employed in imaging devices including one or more SPAD arrays, such as proximity sensors and time of flight sensors. One embodiment is directed to a charge pump overload detection circuit that includes a charge pump, a charge pump supply regulation device, a charge pump voltage regulation feedback loop and a charge pump overload detection comparator. The charge pump supplies an output voltage to a load, and the charge pump supply regulation device supplies a regulated voltage to an input of the charge pump. The charge pump voltage regulation feedback loop includes a feedback voltage generator that generates a feedback voltage based on the charge pump output voltage, and an amplifier that generates and provides a charge pump regulation control signal to the charge pump supply regulation device based on a difference between the feedback voltage and a reference voltage. The charge pump overload detection comparator compares the charge pump regulation control signal with a second reference voltage, and outputs an overload signal based on the comparison.

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