Energy harvesting circuit, corresponding system and operating method

    公开(公告)号:US11862988B2

    公开(公告)日:2024-01-02

    申请号:US17109345

    申请日:2020-12-02

    CPC classification number: H02J50/27 H02J50/001 H04B5/0037

    Abstract: A first RF-to-DC circuit receives a radiofrequency signal and produces a first converted signal delivered to an energy storage circuit. A second RF-to-DC circuit, which is a down-scaled replica of the first RF-to-DC circuit, produces a second converted signal from the radiofrequency signal that is indicative of an open-circuit voltage of the first RF-to-DC circuit. The first RF-to-DC section includes N sub-stages, with a sub-set of sub-stages being selectively activatable. A window comparison of the second converted signal generates a first signal and a second signal indicative of whether the second converted signal is within a range of values proportional to a voltage reference signal. The sub-set of sub-stages is selectively deactivated, respectively activated, when the performed window comparison has a first result, respectively, a second result.

    Energy harvester, corresponding apparatus and method

    公开(公告)号:US10044290B2

    公开(公告)日:2018-08-07

    申请号:US15160674

    申请日:2016-05-20

    Abstract: An energy harvester circuit operates to harvest energy in battery-less electrical apparatus. The circuit includes a string of capacitors coupled to a circuit input to receive energy to be harvested. A string of transistors are coupled as pumping transistors to respective ones of the capacitors in the string of capacitors. A compensation coupling circuit is coupled between each transistor in the string of pumping transistors and one of a subsequent or a preceding transistor in the string of pumping transistors.

    Oscillator circuit, corresponding radar sensor, vehicle and method of operation

    公开(公告)号:US11604267B2

    公开(公告)日:2023-03-14

    申请号:US17395016

    申请日:2021-08-05

    Abstract: An oscillator includes a tunable resonant circuit having an inductance and a variable capacitance coupled between first and second nodes, and a set of capacitances selectively coupleable between the first and second nodes. An input control node receiving an input control signal is coupled to the variable capacitance and set of capacitances. The tunable resonant circuit is tunable based on the input control signal. A biasing circuit biases the tunable resonant circuit to generate a variable-frequency output signal between the first and second nodes. A voltage divider generates a set of different voltage thresholds, and a set of comparator circuits with hysteresis compares the input control signal to the set of different voltage thresholds to generate a set of control signals. The capacitances in the set of capacitances are selectively coupleable between the first and second nodes as a function of control signals in the set of control signals.

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