公开(公告)号：US20200256970A1

公开(公告)日：2020-08-13

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：US20220011420A1

公开(公告)日：2022-01-13

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

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：US20210126644A1

公开(公告)日：2021-04-29

申请号：US17072225

申请日：2020-10-16

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： RAHUL SHARMA ,  ASWATH VS ,  SRIRAM MURALI ,  PRASAD GANDEWAR ,  SANDEEP KESRIMAL OSWAL

IPC: H03M1/06 ,  H04W88/08 ,  H04L1/00

Abstract: Analog gain correction circuitry and analog switching clock edge timing correction circuitry can provide coarse correction of interleaving errors in radio-frequency digital-to-analog converters (RF DACs), such as may be used in 5G wireless base stations. The analog correction can be supplemented by digital circuitry configured to “pre-cancel” an interleaving image by adding to a digital DAC input signal a signal equal and opposite to an interleaving image created by the interleaving DAC, such that the interleaving image is effectively mitigated. Error correction control parameters can be periodically adjusted for changes in temperature by a controller coupled to an on-chip temperature sensor. A model useful for understanding the sources of error in interleaving DACs is also described.

公开(公告)号：US20180156903A1

公开(公告)日：2018-06-07

申请号：US15367982

申请日：2016-12-02

Applicant: Texas Instruments Incorporated

Inventor： RAVIKUMAR PATTIPAKA ,  RAJA SEKHAR KANAKAMEDALA ,  ARAVIND MIRIYALA ,  VAJEED NIMRAN P A ,  SANDEEP KESRIMAL OSWAL

IPC: G01S7/52 ,  A61B8/00 ,  A61B8/14 ,  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：US20170160129A1

公开(公告)日：2017-06-08

申请号：US15373242

申请日：2016-12-08

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： RAKUL VISWANATH ,  NAGESH SURENDRANATH ,  SANDEEP KESRIMAL OSWAL

IPC: G01J1/44 ,  G01J1/46

CPC classification number: G01J1/44 ,  G01J1/46 ,  G01J2001/442 ,  G01J2001/444

Abstract: A circuit includes a charge sensitive amplifier (CSA) that includes an input to receive current from a photon sensor and generates an output signal that represents photons received by the sensor and dark current of the sensor. A control circuit generates a compensation signal to offset the dark current from the photon sensor at the input of the CSA. The control circuit couples feedback from the CSA to enable the compensation signal if the photon current received from the sensor is below a predetermined threshold. The control circuit decouples the feedback from the CSA to disable the compensation signal if the photon current received from the sensor is above the predetermined threshold.