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公开(公告)号：US11855592B2
公开(公告)日：2023-12-26
申请号：US17720869
申请日：2022-04-14
Inventor： John L Melanson
CPC classification number: H03F3/217 , H03F2200/03 , H03F2200/375
Abstract: A switched mode amplifier system may include a switched mode amplifier having an amplifier input coupled to an output of an analog integrator and an amplifier output and include a calibration system. The calibration system may be configured to force the input of the analog integrator to a fixed known input value, force the amplifier output to a fixed known duty cycle, measure an analog signal generated at the output of the analog integrator in response to forcing the input of the analog integrator to the fixed value, determine an offset of the switched mode amplifier system based on the analog signal, and correct for the offset.
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公开(公告)号：US12163984B2
公开(公告)日：2024-12-10
申请号：US17510675
申请日：2021-10-26
Inventor： Vamsikrishna Parupalli , Gaurav Agarwal , John L Melanson
Abstract: Accurate operation of a current monitor is provided by injecting a bias voltage to a maintain de-selected sense amplifier input in an active state. An electronic system includes an output stage to supply a load current and includes two push-pull output drivers having sense resistors supplying a first and a second sense voltage. An included mode control circuit selects between a first and a second operating mode and selects a polarity of the current. An included current monitor receives the sense voltages and has a control input coupled to the mode selection control circuit. The current monitor provides an output that is dependent on both sense voltages in the first operating mode and is indicative of one of the sense voltages selected according to the selected polarity in the second operating mode. The bias voltage is injected into an unselected sense inputs to maintain active operation of the sense amplifier.
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公开(公告)号：US11808669B2
公开(公告)日：2023-11-07
申请号：US17215117
申请日：2021-03-29
Inventor： Tejasvi Das , Siddharth Maru , John L Melanson
CPC classification number: G01N27/025 , G01N27/028
Abstract: A system may include a resonant sensor configured to sense a physical quantity, a measurement circuit communicatively coupled to the resonant sensor and configured to measure one or more resonance parameters associated with the resonant sensor and indicative of the physical quantity using an incident/quadrature detector having an incident channel and a quadrature channel and perform a calibration of a non-ideality between the incident channel and the quadrature channel of the system, the calibration comprising determining the non-ideality by controlling the sensor signal, an oscillation signal for the incident channel, and an oscillation signal for the quadrature channel; and correcting for the non-ideality.
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