Voltage converter and method
    453.
    发明授权

    公开(公告)号:US11750096B2

    公开(公告)日:2023-09-05

    申请号:US17388553

    申请日:2021-07-29

    Inventor: David Chesneau

    CPC classification number: H02M3/158

    Abstract: An embodiment voltage converter includes a first transistor connected between a first node of the converter and a second node configured to receive a power supply voltage, a second transistor connected between the first node and a third node configured to receive a reference potential, a first circuit configured to control the first and second transistors, and a comparator configured to compare a first voltage with a threshold, the first voltage being equal, during a first period, to a first increasing ramp and, during a second period, to a second decreasing ramp, the threshold having a first value during the first period and a second value during the second period, the first and second values being variable.

    Ambient light sensor and method
    455.
    发明授权

    公开(公告)号:US11713998B2

    公开(公告)日:2023-08-01

    申请号:US17663915

    申请日:2022-05-18

    CPC classification number: G01J1/4204 G01J1/44 G01J2001/446

    Abstract: According to one aspect, an ambient-light sensor includes a photodiode configured to generate an electrical signal according to an ambient light, a capacitive-feedback transimpedance amplifier connected at its input to the photodiode for receiving a signal generated by the photodiode and for generating as an output an amplified signal from the signal generated by the photodiode, and an auto-zero switch at the input of the capacitive-feedback transimpedance amplifier. The ambient-light sensor further includes a control circuit including a bootstrap circuit configured to receive an initial positive- or zero-voltage logic control signal, and then generate, from this initial logic control signal, an adapted logic control signal having a first positive voltage level and a second negative voltage control level for controlling the auto-zero switch.

    EXCITATION AND SENSING OF A NETWORK OF LC OSCILLATORS

    公开(公告)号:US20230228554A1

    公开(公告)日:2023-07-20

    申请号:US18147927

    申请日:2022-12-29

    CPC classification number: G01B7/30 H03B5/08

    Abstract: An electronic system includes a first LC oscillator connected to a first general-purpose input/output (GPIO) circuit and a second LC oscillator connected to a second GPIO circuit. A threshold generator is coupled to an input of the comparator. A control circuit is configured to control a measurement phase comprising a first capture phase and a second capture phase. A microcontroller is coupled to the control circuit and a power management circuit is configured to switch-off the microcontroller following activation of the control circuit by the microcontroller. The control circuit is configured to control the application of an excitation signal to the each oscillator via the respective GPIO circuit, control the GPIO circuit so that oscillations of the oscillator are provided to the comparator, and count, based on an output of the comparator, a number of oscillations in the oscillator exceeding a threshold output by the threshold generator.

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