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公开(公告)号：US11143552B2
公开(公告)日：2021-10-12
申请号：US14698978
申请日：2015-04-29
Applicant: Texas Instruments Incorporated
Inventor： Subhash Chandra Venkata Sadhu , Bharath Patil
Abstract: The disclosure provides a circuit to mitigate ripple. The circuit includes a controller that generates a PWM (pulse width modulated) clock signal. A DC/DC converter receives the PWM clock signal, and generates an output signal. A light source is coupled to the DC/DC converter, and receives the output signal. The light source transmits light pulses during an integration time. A time integral of the output signal during the integration time is constant during a plurality of quad time periods.
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公开(公告)号：US10935641B2
公开(公告)日：2021-03-02
申请号：US15796930
申请日：2017-10-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Subhash Chandra Venkata Sadhu , Bharath Patil
IPC: G01S7/4915 , G01S17/36 , G01S17/89
Abstract: A distance measurement system includes a light transmitter to generate a modulated light signal, a light sensor to generate measurement signals from reflected light among four quad phase angles with respect to a phase of the generated light signal, and a controller. The controller selects a first set of quad phase angles, and generates first measurement signals at the quad phase angles of the first set. Based on the first measurement signals, the controller computes a first phase angle between the generated light signal and the reflected light signal, generates a second set of quad phase angles based on the first phase angle, and generates second measurement signals at the quad phase angles of the second set. Further, based on the second measurement signals, the controller computes a second phase angle between the generated light signal and the reflected light signal and calculates a distance using the second phase angle.
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公开(公告)号：US20200249331A1
公开(公告)日：2020-08-06
申请号：US16855287
申请日：2020-04-22
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Bharath Patil , Anjana Sharma , Subhash Chandra Venkata Sadhu , Ravishankar Ayyagari
Abstract: Systems and methods are provided for imaging a surface via time of flight measurement. An illumination system includes an illumination driver and an illumination source and is configured to project modulated electromagnetic radiation to a point on a surface of interest. A sensor system includes a sensor driver and is configured to receive and demodulate electromagnetic radiation reflected from the surface of interest. A temperature sensor is configured to provide a measured temperature representing a temperature at one of the illumination driver and the sensor driver and located at a position remote from the one of the illumination driver and the sensor driver. A compensation component is configured to calculate a phase offset between the illumination system and the sensor system from at least the measured temperature and a model representing transient heat flow within the system.
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公开(公告)号：US20200225323A1
公开(公告)日：2020-07-16
申请号：US16834385
申请日：2020-03-30
Applicant: Texas Instruments Incorporated
Inventor： Subhash Chandra Venkata Sadhu
IPC: G01S7/484 , G01S7/4865 , G01S17/10 , G01S17/89
Abstract: An optical transmitting system for distance measuring includes a modulation signal generator, a light source, and an illumination driver coupled to the modulation signal generator and the light source. The modulation signal generator is configured to generate a modulation signal. The light source is configured to generate an optical waveform with amplitude modulation corresponding with the modulation signal. The illumination driver is configured to drive the light source. The illumination driver includes a switch and a switch driver. The switch is configured to switch between an on state and an off state to drive the light source. The switch driver is configured to drive the switch between the on and off states. The switch driver includes a first inductor and a capacitor in series with the first inductor and the switch.
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