公开(公告)号：US20200041629A1

公开(公告)日：2020-02-06

申请号：US16052042

申请日：2018-08-01

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lei DING ,  Srinath Mathur RAMASWAMY

IPC: G01S7/527 ,  H03M1/12 ,  H03K5/24 ,  H03F3/04 ,  H03G3/30

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.

公开(公告)号：US20200209388A1

公开(公告)日：2020-07-02

申请号：US16232308

申请日：2018-12-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lei DING ,  Srinath Mathur RAMASWAMY ,  Anand DABAK

IPC: G01S15/58 ,  G01S15/93 ,  G01S7/53

Abstract: An ultrasound detect circuit includes a decimator that decimates a transmit signal to be transmitted through an ultrasonic transducer. The transmit signal is decimated to generate first and second template signals. The decimator uses a different decimation ratio to generate the first template signal than the second template signal. The circuit also includes a first correlator to correlate a signal derived from the ultrasonic transducer with the first template signal, aa second correlator to correlate the signal derived from the ultrasonic transducer with the second template signal, and a Doppler shift determination circuit to determine a Doppler frequency shift based on an output from the first correlator and an output from the second correlator.

公开(公告)号：US20230049751A1

公开(公告)日：2023-02-16

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 ,  H01L31/107 ,  G01S7/4861

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.

公开(公告)号：US20200209031A1

公开(公告)日：2020-07-02

申请号：US16232138

申请日：2018-12-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Anand DABAK ,  Srinath Mathur RAMASWAMY ,  Luis Fernando REYNOSO COVARRUBIAS

IPC: G01F1/66

Abstract: A computer-readable storage device stores machine instructions which, when executed by one or more central processing unit (CPU) cores, causes the one or more CPU cores to use a first ultrasonic transducer and a second ultrasonic transducer to measure fluid flow using a current measurement frequency and to perform a temperature calibration process. The temperature calibration process includes the sequentially generation of a plurality of electrical signals for the first ultrasonic transducer, the generated electrical signals each having a different frequency. For each frequency, the temperature calibration process includes the measurement of an amplitude of a signal from the second ultrasonic transducer. Based on the measured amplitudes of the signals from the second ultrasonic transducer, the temperature calibration process includes the determination of a new measurement frequency. The first and second ultrasonic transducers are used to measure fluid flow using the new measurement frequency.

公开(公告)号：US20140368377A1

公开(公告)日：2014-12-18

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: G01N22/00

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。