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公开(公告)号：US11070177B2
公开(公告)日：2021-07-20
申请号：US16562856
申请日：2019-09-06
Inventor： Saurabh Singh , Vamsikrishna Parupalli , Stewart Kenly , Eric B. Smith
Abstract: A system may include an output stage comprising a single-ended driver for driving a load at an output of the output stage, a loop filter coupled at its input to the output of the output stage and configured to minimize an error between a target current signal received by the loop filter and an output current driven on the load, and control circuitry configured to, when the load current is driven in a manner such that the load current changes polarity, reset a state variable of the loop filter.
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公开(公告)号：US10324113B2
公开(公告)日：2019-06-18
申请号：US15069733
申请日：2016-03-14
Inventor： Vamsikrishna Parupalli , Itisha Tyagi
Abstract: The overall performance of a current sense amplifier system may be improved by increasing the common mode rejection of the system. In particular, improved current sense amplifiers may be configured to use a first signal path coupled to the amplifier and a first input terminal, wherein the first signal path is configured to measure the current through a device by generating a voltage proportional to the measured current, wherein the generated voltage includes a small signal voltage with a large common mode voltage, and a second signal path coupled to the amplifier and the first input terminal, wherein the second signal path is configured to reduce the common mode of the generated voltage by level shifting the generated voltage to reduce the common mode voltage.
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23.发明授权公开(公告)号：US11949321B2
公开(公告)日：2024-04-02
申请号：US17510707
申请日：2021-10-26
Inventor： Vamsikrishna Parupalli , Nishant Jain , Mengde Wang
CPC classification number: H02M1/0045 , H02M1/088 , H02P27/08
Abstract: An electronic control system provides selectable linear and pulse-width modulated (PWM) operation with reduced disruption when changing from PWM operation to linear operation. The system includes an output stage that has a push-pull driver coupled to the load, which may be a motor, a haptic device, or other device requiring current-mode control. The system also includes a pulse-width modulated (PWM) driver for providing pulse-width modulated drive signals to gates of the transistors of the output stage when a pulse-width modulated mode is selected, and a linear amplifier stage that provides a linear analog signal to the gates of the transistors when a linear mode is selected. A pre-charging circuit pre-charges the gates during a pre-charge cycle that is initiated when the operating mode changes from the PWM operating more to the linear operating mode.
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公开(公告)号：US11940827B1
公开(公告)日：2024-03-26
申请号：US18078292
申请日：2022-12-09
Inventor： Stewart G. Kenly , Vamsikrishna Parupalli , Nishant Jain , Eric B. Smith
Abstract: An electronic control system provides selectable path operation, such as linear and pulse-width modulated (PWM) operation and provides path transition management to improve operation. The system supplies a current or a voltage to a load in response to an input signal or value and includes an output driver, and multiple selectable control paths. The system includes a control circuit that selects between the first control path and the second control path in response to a path selection indication to drive the output driver. The system may include an evaluator that determines the path selection indication in conformity with an amplitude and a slew rate of the input. One or all of the control paths may have a response time to changes in the input signal or value, and the control circuit may delay switching from the second control path to the first control path to compensate for the response time.
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公开(公告)号：US20240072747A1
公开(公告)日：2024-02-29
申请号：US17894294
申请日：2022-08-24
Inventor： Vamsikrishna Parupalli
IPC: H03F3/45
CPC classification number: H03F3/4565 , H03F3/45183 , H03F3/45475
Abstract: A differential amplifier provides improved signal swing and reduced common-mode output noise. The differential amplifier circuit includes a driver circuit with a first output for driving a first output of the differential amplifier and with a second output for driving a second output of the differential amplifier. The driver circuit has inputs for receiving a differential (complementary) pair of input signals at least one common-mode reference input for receiving a common-mode reference signal. The differential amplifier also includes a signal maxima detector having inputs for receiving the differential input signals that detects a maximum value between the individual signals, including any input common-mode voltage. The differential amplifier also includes a common-mode reference circuit that provides the common-mode reference signal and an input coupled to an output of the signal maxima detector, so that a common-mode voltage of the outputs is independent of power supply voltages provided to the driver circuit.
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Patent Agency Ranking
26.发明公开公开(公告)号：US20240053425A1
公开(公告)日：2024-02-15
申请号：US17884521
申请日：2022-08-09
Inventor： Vamsikrishna Parupalli , Zhong You
CPC classification number: G01R35/005 , G01R27/16
Abstract: An integrated circuit (IC) provides on-line, wafer-level, die-level, or package-level thermal calibration of an integrated thin-film resistor, by thermally enclosing the thin-film resistor with metal layers formed above and below the thin-film resistor along its length and width. Metal vias thermally couple the metal layers to the substrate to at least partially equalize the temperature of the metal layers and the thin-film resistor and the substrate. A controllable heat source, which may be provided by another thin-film resistor integrated on or below the substrate, and a reference temperature sensor provide heating/calibration measurement of the resistance of the thin-film resistor over a range of temperature. The reference temperature sensor may be provided within the IC, for example, integrated on the substrate or packaged with the die containing the thin-film resistor, or may be otherwise thermally coupled to the metal layers, e.g., by an extension of one of the metal layers.
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公开(公告)号：US11119138B1
公开(公告)日：2021-09-14
申请号：US16838405
申请日：2020-04-02
Inventor： Vikrant Arumugam , Amar Vellanki , Vamsikrishna Parupalli , Zhong You , Johann G. Gaboriau , John L. Melanson
IPC: G01R27/26
Abstract: A method may include applying an excitation signal to a capacitor of the capacitive sensor which causes generation of a modulated signal from an input signal indicative of a variance in a capacitance of the capacitor, detecting the modulated signal with a detector to generate a detected modulated signal that has a phase shift relative to the excitation signal, demodulating the detected modulated signal into an in-phase component and a quadrature component using a reference signal, nullifying the quadrature component by setting a phase of the reference signal relative to the excitation signal to compensate for the phase shift, and outputting the in-phase component as an unmodulated output signal representative of the capacitance.
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公开(公告)号：US11115046B2
公开(公告)日：2021-09-07
申请号：US16431276
申请日：2019-06-04
Inventor： Vamsikrishna Parupalli , Mark May , Saurabh Singh , Ramya Balasundaram , Mengde Wang , Eric B. Smith
Abstract: A system may include an output stage for driving a load at an output of the output stage, a pulse-width modulation mode path configured to pre-drive the output stage in a first mode of operation, a linear mode path configured to pre-drive the output stage in a second mode of operation and a loop filter coupled at its input to the output of the output stage and coupled at its output to both of the pulse-width modulation mode path and the linear mode path. The pulse-width modulation mode path and the linear mode path may be configured such that a first transfer function between the output of the loop filter and the output of the output stage is substantially equivalent to a second transfer function between the output of the loop filter and the output of the output stage.
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公开(公告)号：US20210075382A1
公开(公告)日：2021-03-11
申请号：US16562856
申请日：2019-09-06
Inventor： Saurabh Singh , Vamsikrishna Parupalli , Stewart Kenly , Eric B. Smith
Abstract: A system may include an output stage comprising a single-ended driver for driving a load at an output of the output stage, a loop filter coupled at its input to the output of the output stage and configured to minimize an error between a target current signal received by the loop filter and an output current driven on the load, and control circuitry configured to, when the load current is driven in a manner such that the load current changes polarity, reset a state variable of the loop filter.
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公开(公告)号：US10756709B1
公开(公告)日：2020-08-25
申请号：US16439178
申请日：2019-06-12
Inventor： Mengde Wang , Akhilesh Persha , Eric B. Smith , Vamsikrishna Parupalli
Abstract: A system may include a driver for driving an output signal to a load, a pre-driver for driving a pre-driver signal to the driver, the pre-driver having a variable drive strength, and a controller configured to control the variable drive strength based on at least one measured physical quantity to compensate for variation of an output signal edge rate due to variations in the at least one measured physical quantity.
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