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公开(公告)号：US12154992B2
公开(公告)日：2024-11-26
申请号：US17402287
申请日：2021-08-13
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rahmi Hezar , Henry Litzmann Edwards , Miaad Aliroteh , Srinath Mathur Ramaswamy , Baher Haroun , Gerd Schuppener
IPC: H01L31/02 , G01S7/4861 , H01L31/107
Abstract: A sensor chip includes a sensor pixel. The sensor pixel includes an avalanche photodetector. A circuit is adjacent to the avalanche photodetector. The circuit is coupled to the avalanche photodetector. An isolation structure at least partially encloses the circuit and is between the avalanche photodetector and the circuit.
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2.发明申请公开(公告)号：US20170324449A1
公开(公告)日：2017-11-09
申请号：US15658637
申请日：2017-07-25
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Pourya Assem , Hun Seok Kim , Jing-Fei Ren , Srinath Mathur Ramaswamy
IPC: H04B5/00 , H04W4/00 , H04B17/318 , H04W4/02 , H04B17/27
CPC classification number: H04B5/0043 , H04B17/27 , H04B17/318 , H04W4/023 , H04W4/80
Abstract: Methods and apparatus to determine nearfield localization using phase and received signal strength indication (RSSI) diversity are disclosed. An example method includes determining a first strength of an electric field and a second strength of a magnetic field, the electric field and the magnetic field associated with an electromagnetic signal sent from a transmitter; determining a difference between the first strength and the second strength; and determining a transmitter distance based on the difference between the first strength and the second strength.
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公开(公告)号：US11733377B2
公开(公告)日：2023-08-22
申请号：US16364652
申请日：2019-03-26
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Lei Ding , Srinath Mathur Ramaswamy , Anand Gopalan , Vaibhav Garg , Anand Ganesh Dabak , Baher S. Haroun
IPC: G01S15/10 , G01S15/931 , G01S15/32 , G01S15/58
CPC classification number: G01S15/104 , G01S15/325 , G01S15/582 , G01S15/931 , G01S2015/938
Abstract: In an ultrasonic detection system that uses frequency-modulation or phase-modulation coding to distinguish emitted bursts from multiple transducers, a receiver associated with a transducer uses peak search, peak buffer, and peak rank stages in one or more receiver signal processing paths to identify valid received ultrasonic signal envelope peaks in correlator outputs. The peak rank stage can support different modes respectively designed to handle one code, two or more codes, or two or more codes with support for Doppler frequency shift detection. Valid peak information (e.g., amplitude and time) can be reported to a central controller and/or stored locally in a fusion stage to generate more intelligent information for targets or obstacles using peaks from multiple bursts.
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公开(公告)号：US11644555B2
公开(公告)日：2023-05-09
申请号：US16364691
申请日：2019-03-26
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Lei Ding , Srinath Mathur Ramaswamy , Vaibhav Garg , Anand Gopalan
CPC classification number: G01S7/536 , G01S15/325
Abstract: In an ultrasonic detection system that uses frequency-modulation coding to distinguish emitted bursts from multiple transducers, a receiver associated with a transducer uses dynamic thresholding to discriminate valid echoes from system and environmental noise in multiple envelope signals produced by multiple correlators. The time-varying dynamic thresholds are generated from the mean of noise in a respective envelope derived from the output of a respective correlator. Multiple thresholds can be combined together such that a single time-varying threshold is applied to all correlators' envelopes. Such thresholding has the benefits of a constant false-alarm rate with regard to detection of echoes (as opposed to false triggering from noise), and, owing to finer-resolution and adaptive thresholds, can detect targets or obstacles as further distances and with greater time responsiveness.
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5.发明授权公开(公告)号：US11175402B2
公开(公告)日：2021-11-16
申请号：US16694506
申请日：2019-11-25
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Lei Ding , Srinath Mathur Ramaswamy , Anand Gopalan
Abstract: Ultrasonic ranging systems and methods that emit coded bursts and correlate transduced acoustical echoes of the bursts with a receive template characterizing a burst code to determine time-of-flight information use receive templates of time-variable length to improve short-range object detection. The template length is based on a time index measured from the start of the burst emission. The detection can account for a dead zone of transducer ringing following a burst. A time-variable gain that is also based on the time index can be applied to the correlated signal. The length and gain can be adjusted with reduced temporal frequency to reduce computation cost.
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Patent Agency Ranking
6.发明授权公开(公告)号：US10141981B2
公开(公告)日：2018-11-27
申请号：US15658637
申请日：2017-07-25
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Pourya Assem , Hun Seok Kim , Jing-Fei Ren , Srinath Mathur Ramaswamy
IPC: H04B5/00 , H04B17/318 , H04W4/02 , H04W4/80 , H04B17/27
Abstract: Methods and apparatus to determine nearfield localization using phase and received signal strength indication (RSSI) diversity are disclosed. An example method includes determining a first strength of an electric field and a second strength of a magnetic field, the electric field and the magnetic field associated with an electromagnetic signal sent from a transmitter; determining a difference between the first strength and the second strength; and determining a transmitter distance based on the difference between the first strength and the second strength.
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7.发明授权公开(公告)号：US09325334B2
公开(公告)日：2016-04-26
申请号：US13916331
申请日：2013-06-12
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Phillip Michel Nadeau , Django Trombley , Baher S. Haroun , Srinath Mathur Ramaswamy
IPC: H03L7/26
CPC classification number: H03L7/26
Abstract: A frequency reference device that includes a frequency reference generation unit to generate a frequency reference signal based on an absorption line of a gas.
Abstract translation: 一种频率参考装置，包括频率参考产生单元，用于基于气体的吸收线产生频率参考信号。
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公开(公告)号：US11143751B2
公开(公告)日：2021-10-12
申请号：US16052042
申请日：2018-08-01
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Lei Ding , Srinath Mathur Ramaswamy
Abstract: An ultrasonic sensing system includes: an amplifier including an input and an output; and an n-level comparator, coupled to the output of the amplifier, to compare an adjustable threshold voltage to an output signal from the output of the amplifier. N is greater than or equal to 1. The system also includes a noise power estimator, coupled to an output of the n-level comparator, to generate a noise power signal indicative of noise power of an input signal at the input of the amplifier. The system further includes a time-varying threshold circuit, coupled to the noise power estimator and the n-level comparator, to adjust the adjustable threshold voltage based on the noise power signal.
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公开(公告)号：US10682670B2
公开(公告)日：2020-06-16
申请号：US15675162
申请日：2017-08-11
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Lei Ding , Srinath Mathur Ramaswamy , Baher Haroun
Abstract: An ultrasonic detection circuit includes a transmitter circuit that provides excitation signals to an ultrasonic transducer during an excitation interval. A control circuit includes a port to receive a command. The control circuit controls the frequency and the duty cycle of the excitation signals of the transmitter circuit during the excitation interval. The control circuit generates a first excitation signal sequence of the excitation interval followed by a first monitoring period to receive a first echo signal in response to the command. The control circuit generates a second excitation signal sequence of the excitation interval followed by a second monitoring period to receive a second echo signal in response to the command. The control circuit outputs results via the port based on at least one of the first or second echo signals received.
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公开(公告)号：US10585177B2
公开(公告)日：2020-03-10
申请号：US15626964
申请日：2017-06-19
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Lei Ding , Srinath Mathur Ramaswamy
Abstract: A circuit includes an ultrasonic transducer having a first terminal and a second terminal. The first terminal receives an electrical drive signal and excites the ultrasonic transducer during an excitation interval to provide an ultrasound signal. The first terminal also provides an electrical receive signal in response to the ultrasonic transducer receiving a reflected ultrasound signal. The circuit includes a capacitor having one terminal connected to the first terminal of the ultrasonic transducer. A resistor is connected to another terminal of the capacitor to form a resistor-capacitor (RC) network. At least one of resistor and the capacitor have a variable resistance or capacitance value that is set to tune the RC network to mitigate ringing of the ultrasonic transducer following the excitation interval.
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