公开(公告)号：US11888509B2

公开(公告)日：2024-01-30

申请号：US16234672

申请日：2018-12-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Aravind Miriyala ,  Ravikumar Pattipaka ,  Raja Sekhar Kanakamedala ,  Sandeep Kesrimal Oswal

IPC: H04B1/44 ,  H03K17/00 ,  B06B1/02 ,  H04B11/00 ,  A61B8/00 ,  A61B8/14

CPC classification number: H04B1/44 ,  B06B1/023 ,  H03K17/00 ,  H03K17/002 ,  H04B11/00 ,  A61B8/14 ,  A61B8/54 ,  B06B2201/76

Abstract: An ultrasound system includes a transmit-receive switch. The transmit-receive switch includes a combined transmit-receive and return-to-zero (RTZ) path. The combined transmit-receive and RTZ path includes a transistor with a first current terminal, a second current terminal, and a control terminal. The second current terminal of the transistor is coupled to a ground node via a first switch and is coupled to a receive node via a second switch. The ultrasound system also includes a receiver front-end circuit coupled to the receive node.

公开(公告)号：US11662448B2

公开(公告)日：2023-05-30

申请号：US17487259

申请日：2021-09-28

Applicant: Texas Instruments Incorporated

Inventor： Ravikumar Pattipaka ,  Raja Sekhar Kanakamedala ,  Aravind Miriyala ,  Vajeed Nimran P A ,  Sandeep Kesrimal Oswal

IPC: G01S7/52 ,  A61B8/00 ,  A61B8/08

CPC classification number: G01S7/52077 ,  A61B8/4483 ,  A61B8/5269

Abstract: Methods and apparatus for reducing a transient glitch in ultrasound applications are disclosed. An example apparatus includes a transducer to (A) output a signal during a transmit phase and (B) receive a reflected signal corresponding to the signal during a receive phase; a receiver switch coupled to the transducer at a first node, the receiver switch to (A) open during the transmit phase and (B) close during the receive phase; and a clamp coupled to the transducer at the first node, the clamp to provide a high impedance during the transmit phase and the receive phase and provide a low impedance during a transient phase.

公开(公告)号：US11533068B1

公开(公告)日：2022-12-20

申请号：US17462145

申请日：2021-08-31

Applicant: Texas Instruments Incorporated

Inventor： Rahul Sharma ,  Karthikeyan Gunasekaran ,  Sarma Sundareswara Gunturi ,  Ram Narayan Krishna Nama Mony ,  Jaiganesh Balakrishnan ,  Sandeep Kesrimal Oswal ,  Visvesvaraya Pentakota

IPC: H04L5/12 ,  H04L23/02 ,  H04B1/00 ,  H04B1/30

Abstract: A radio frequency transmitter includes an upconverter that outputs in-phase (I) and quadrature (Q) signals, a digital timing offset circuit, first and second digital-to-analog converters (DACs), an analog timing offset removal circuit, first and second pulse shapers, and an adder. The digital timing offset circuit introduces a time offset between the I and Q signals. The first and second DACs output analog I and Q signals, respectively, and have first and second clock signals, respectively. The first and second clock signals have the same frequency and are offset relative to each other by the time offset. The analog timing offset removal circuit removes the time offset between the analog I and Q signals. The first and second pulse shapers receive the analog I and Q signals, respectively, and output pulse-shaped I and Q signals. The adder receives the pulse-shaped I and Q signals and outputs an intermediate frequency signal.

公开(公告)号：US11509325B2

公开(公告)日：2022-11-22

申请号：US17168584

申请日：2021-02-05

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Srinivasa Rao Madala ,  Rahul Sharma ,  Sandeep Kesrimal Oswal

IPC: H03M1/66 ,  H03M1/76 ,  H03M1/06 ,  H04B1/04 ,  H03M1/54 ,  H04L25/03 ,  H03M1/12

Abstract: A digital-to-analog converter system has digital-to-analog converters, a common output, and a digital controller for transmitting first codes to one of the converters at a radio-frequency digital rate, and for transmitting second codes to another one of the converters at the same rate. The digital controller includes a timing system for operating each converter at the digital rate in a return-to-zero configuration, such that a signal from the first converter is transmitted to the common output while the second converter is reset, and vice versa. The digital-to-analog converter system can generate a radio-frequency analog signal having signals in first and second Nyquist zones simultaneously.

公开(公告)号：US20220209722A1

公开(公告)日：2022-06-30

申请号：US17137685

申请日：2020-12-30

Applicant: Texas Instruments Incorporated

Inventor： Sravana Kumar Goli ,  Nagesh Surendranath ,  Srinivas Bangalore Seshadri ,  Sandeep Kesrimal Oswal

IPC: H03F3/08 ,  G01T1/175 ,  H03M1/60 ,  H03L7/093

Abstract: In described examples, a circuit includes an integrator. The integrator generates a first signal responsive to an input signal. A trigger circuit is coupled to the integrator and receives the first signal. A charge dump circuit is coupled to the integrator and the trigger circuit. The trigger circuit modifies configuration of the charge dump circuit and the integrator when the first signal is greater than a first threshold.

公开(公告)号：US11163046B2

公开(公告)日：2021-11-02

申请号：US16859440

申请日：2020-04-27

Applicant: Texas Instruments Incorporated

Inventor： Ravikumar Pattipaka ,  Raja Sekhar Kanakamedala ,  Aravind Miriyala ,  Vajeed Nimran P A ,  Sandeep Kesrimal Oswal

IPC: G01S7/52 ,  A61B8/00 ,  A61B8/08

Abstract: Methods and apparatus for reducing a transient glitch in ultrasound applications are disclosed. An example apparatus includes a transducer to (A) output a signal during a transmit phase and (B) receive a reflected signal corresponding to the signal during a receive phase; a receiver switch coupled to the transducer at a first node, the receiver switch to (A) open during the transmit phase and (B) close during the receive phase; and a clamp coupled to the transducer at the first node, the clamp to provide a high impedance during the transmit phase and the receive phase and provide a low impedance during a transient phase.

公开(公告)号：US11067440B2

公开(公告)日：2021-07-20

申请号：US16437108

申请日：2019-06-11

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Rakul Viswanath ,  Nagesh Surendranath ,  Sandeep Kesrimal Oswal ,  Ratna Kumar Venkata Parupudi

IPC: G01J1/44 ,  H03K5/24

Abstract: A dark current compensation circuit comprises a first comparator having inputs for a detection signal and a first voltage, and a second comparator having inputs for the detection signal and a second voltage. The dark current compensation circuit also comprises a controller coupled to the first and second comparators, which has an input for an event signal. An adjustable current source is coupled to the controller and configured to generate a compensation current. The controller adjusts a value of the compensation current based on the first and second comparator outputs and maintains a constant value in response to the event signal indicating photons incident on a photon detector. In some implementations, the dark current compensation circuit further comprises an analog sub-circuit coupled to the adjustable current source and configured to receive the detection signal. The analog sub-circuit generates an analog compensation current in response to the detection signal.

公开(公告)号：US10890674B2

公开(公告)日：2021-01-12

申请号：US16247639

申请日：2019-01-15

Applicant: Texas Instruments Incorporated

Inventor： Rakul Viswanath ,  Nagesh Surendranath ,  Sandeep Kesrimal Oswal ,  Ratna Kumar Venkata Parupudi

IPC: G01T1/24 ,  A61B6/03 ,  A61B6/00 ,  H03F3/70 ,  H03M1/46

Abstract: In described examples, a charge sensitive amplifier (CSA) generates an integrated signal in response to a current signal. A high pass filter is coupled to the CSA and receives the integrated signal and an inverse of an event signal, the high pass filter generates a coarse signal. An active comparator is coupled to the high pass filter and receives the coarse signal and a primary reference voltage signal, the active comparator generates the event signal.

公开(公告)号：US20200162097A1

公开(公告)日：2020-05-21

申请号：US16748849

申请日：2020-01-22

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jagannathan Venkataraman ,  Prabu Sankar Thirugnanam ,  Raja Reddy Patukuri ,  Sandeep Kesrimal Oswal

IPC: H03M3/00

Abstract: The disclosure provides a receiver with high dynamic range. The receiver includes a photodiode that generates a current signal. A coupling capacitor is coupled to the photodiode, and generates a modulation signal in response to the current signal received from the photodiode. A sigma delta analog to digital converter (ADC) is coupled to the coupling capacitor, and generates a digital data in response to the modulation signal. A digital mixer is coupled to the sigma delta ADC, and generates an in-phase component and a quadrature component corresponding to the digital data. A processor is coupled to the digital mixer, and processes the in-phase component and the quadrature component corresponding to the digital data.

公开(公告)号：US10362994B2

公开(公告)日：2019-07-30

申请号：US15298764

申请日：2016-10-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Hussam Ahmed ,  Jagannathan Venkataraman ,  Sandeep Kesrimal Oswal ,  Antoine Lourdes Praveen Aroul ,  Hari Babu Tippana ,  Anand Hariraj Udupa

IPC: A61B5/1455 ,  A61B5/00 ,  A61B5/0205 ,  A61B5/024

Abstract: A bio-sensing device (and method) calibrates a time period used to make bio-physical measurements. The device initiates a light source sense phase followed by a first ambient sense phase and a second ambient sense phase. In the light source sense phase, the device is configured to receive a digital value indicative of current through a photodetector while the light source circuit is enabled and in each of the first and second ambient sense phases, the device is configured to receive digital values while the light source circuit is disabled. The device iteratively varies the time period between the phases until the digital value received during the first ambient sense phase is within a threshold of the digital value received during the second ambient sense phase. It then applies the same time separation between the light source sense phase and the ambient phase thereby equalizing the magnitude of the ambient light in the two phases.