公开(公告)号：US11757475B2

公开(公告)日：2023-09-12

申请号：US17492710

申请日：2021-10-04

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jaiganesh Balakrishnan ,  Sriram Murali ,  Sundarrajan Rangachari ,  Yeswanth Guntupalli

IPC: H04B1/10 ,  H04B1/00

CPC classification number: H04B1/0025 ,  H04B1/001 ,  H04B1/0042

Abstract: A radio-frequency (RF) sampling transmitter (e.g., of the type that may be used in 5G wireless base stations) includes a complex baseband digital-to-analog converter (DAC) response compensator that operates on a complex baseband signal at a sampling rate lower than the sampling rate of an RF sampling DAC in the RF sampling transmitter. The DAC response compensator flattens the sample-and-hold response of the RF sampling DAC only in the passband of interest, addressing the problem of a sin c response introduced by the sample-and-hold operation of the RF sampling DAC and avoiding the architectural complexity and high power consumption of an inverse sin c filter that operates on the signal at a point in the signal chain after it has already been up-converted to an RF passband.

公开(公告)号：US11171674B2

公开(公告)日：2021-11-09

申请号：US17022871

申请日：2020-09-16

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jaiganesh Balakrishnan ,  Sriram Murali ,  Sundarrajan Rangachari ,  Yeswanth Guntupalli

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

Abstract: A radio-frequency (RF) sampling transmitter (e.g., of the type that may be used in 5G wireless base stations) includes a complex baseband digital-to-analog converter (DAC) response compensator that operates on a complex baseband signal at a sampling rate lower than the sampling rate of an RF sampling DAC in the RF sampling transmitter. The DAC response compensator flattens the sample-and-hold response of the RF sampling DAC only in the passband of interest, addressing the problem of a sinc response introduced by the sample-and-hold operation of the RF sampling DAC and avoiding the architectural complexity and high power consumption of an inverse sinc filter that operates on the signal at a point in the signal chain after it has already been up-converted to an RF passband.

公开(公告)号：US10741268B2

公开(公告)日：2020-08-11

申请号：US16235698

申请日：2018-12-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Aravind Ganesan ,  Jaiganesh Balakrishnan ,  Nagarajan Viswanathan ,  Yeswanth Guntupalli ,  Ajai Paulose ,  Mathews John ,  Jagannathan Venkataraman ,  Neeraj Shrivastava

IPC: G11C29/02 ,  G11C17/14 ,  G11C17/16 ,  G11C17/18

Abstract: A one-time write, read-only memory for storing trimming parameters includes an address pointer table, a fixed packet portion, and a flexible packet portion. The fixed packet portion includes one or more fixed packets, each fixed packet including trimming parameters for a component identified for trimming during a design phase. The flexible packet portion includes one or more flexible packets of different types. Each flexible packet includes trimming parameters for a component identified for trimming after the design phase. One packet type includes a length section and a number of fields equal to a value stored in the length section. Each field includes an address, a trimming parameter, and a mask. Another packet type includes trimming parameters associated with operands in operating instructions for a microcontroller, where the operands include an address and a mask.

公开(公告)号：US11374669B2

公开(公告)日：2022-06-28

申请号：US16593401

申请日：2019-10-04

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sashidharan Venkatraman ,  Jawaharlal Tangudu ,  Sarma Sundareswara Gunturi ,  Yeswanth Guntupalli

IPC: H04B17/364 ,  H03C3/40 ,  H04L25/03

Abstract: A phase spectrum based delay estimating method of tracking channel responses, extracting phase responses from the tracked channel responses, and generating a delay estimate, wherein the delay estimate is based on a slope and intercept estimates of the extracted phase responses with high quality metric to improve delay estimation, and a system thereof.

公开(公告)号：US20220029644A1

公开(公告)日：2022-01-27

申请号：US17492710

申请日：2021-10-04

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jaiganesh Balakrishnan ,  Sriram Murali ,  Sundarrajan Rangachari ,  Yeswanth Guntupalli

IPC: H04B1/00

Abstract: A radio-frequency (RF) sampling transmitter (e.g., of the type that may be used in 5G wireless base stations) includes a complex baseband digital-to-analog converter (DAC) response compensator that operates on a complex baseband signal at a sampling rate lower than the sampling rate of an RF sampling DAC in the RF sampling transmitter. The DAC response compensator flattens the sample-and-hold response of the RF sampling DAC only in the passband of interest, addressing the problem of a sin c response introduced by the sample-and-hold operation of the RF sampling DAC and avoiding the architectural complexity and high power consumption of an inverse sin c filter that operates on the signal at a point in the signal chain after it has already been up-converted to an RF passband.

公开(公告)号：US11171681B2

公开(公告)日：2021-11-09

申请号：US17072104

申请日：2020-10-16

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sriram Murali ,  Jaiganesh Balakrishnan ,  Pooja Sundar ,  Harshavardhan Adepu ,  Wenjing Lu ,  Yeswanth Guntupalli

IPC: H04B1/40 ,  H04B1/00

Abstract: A digital up-converter (DUC) includes conjugate-mixer-combiner. The conjugate-mixer-combiner includes a pre-combiner configured to generate combinations of a first in-phase (I) value to be transmitted at a first frequency of a first frequency band, a first quadrature (Q) value to be transmitted at the first frequency of a first frequency band, a second I value for to be transmitted at a second frequency of a second frequency band, and a second Q value to be transmitted at the second frequency of a second frequency band. The conjugate-mixer-combiner further includes a plurality of multipliers collectively configured to shift the combinations based on an average difference between the first frequency and the second frequency.

公开(公告)号：US20210083695A1

公开(公告)日：2021-03-18

申请号：US17022871

申请日：2020-09-16

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jaiganesh Balakrishnan ,  Sriram Murali ,  Sundarrajan Rangachari ,  Yeswanth Guntupalli

IPC: H04B1/00

Abstract: A radio-frequency (RF) sampling transmitter (e.g., of the type that may be used in 5G wireless base stations) includes a complex baseband digital-to-analog converter (DAC) response compensator that operates on a complex baseband signal at a sampling rate lower than the sampling rate of an RF sampling DAC in the RF sampling transmitter. The DAC response compensator flattens the sample-and-hold response of the RF sampling DAC only in the passband of interest, addressing the problem of a sinc response introduced by the sample-and-hold operation of the RF sampling DAC and avoiding the architectural complexity and high power consumption of an inverse sinc filter that operates on the signal at a point in the signal chain after it has already been up-converted to an RF passband.

公开(公告)号：US10930362B2

公开(公告)日：2021-02-23

申请号：US16916911

申请日：2020-06-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Aravind Ganesan ,  Jaiganesh Balakrishnan ,  Nagarajan Viswanathan ,  Yeswanth Guntupalli ,  Ajai Paulose ,  Mathews John ,  Jagannathan Venkataraman ,  Neeraj Shrivastava

IPC: G11C29/02 ,  G11C17/18 ,  G11C17/16 ,  G11C17/14

Abstract: A one-time write, read-only memory for storing trimming parameters includes an address pointer table, a fixed packet portion, and a flexible packet portion. The fixed packet portion includes one or more fixed packets, each fixed packet including trimming parameters for a component identified for trimming during a design phase. The flexible packet portion includes one or more flexible packets of different types. Each flexible packet includes trimming parameters for a component identified for trimming after the design phase. One packet type includes a length section and a number of fields equal to a value stored in the length section. Each field includes an address, a trimming parameter, and a mask. Another packet type includes trimming parameters associated with operands in operating instructions for a microcontroller, where the operands include an address and a mask.

公开(公告)号：US11736138B2

公开(公告)日：2023-08-22

申请号：US17493943

申请日：2021-10-05

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sriram Murali ,  Jaiganesh Balakrishnan ,  Pooja Sundar ,  Harshavardhan Adepu ,  Wenjing Lu ,  Yeswanth Guntupalli

IPC: H04B1/40 ,  H04B1/00

CPC classification number: H04B1/40 ,  H04B1/0075

Abstract: A digital up-converter (DUC) includes conjugate-mixer-combiner. The conjugate-mixer-combiner includes a pre-combiner configured to generate combinations of a first in-phase (I) value to be transmitted at a first frequency of a first frequency band, a first quadrature (Q) value to be transmitted at the first frequency of a first frequency band, a second I value for to be transmitted at a second frequency of a second frequency band, and a second Q value to be transmitted at the second frequency of a second frequency band. The conjugate-mixer-combiner further includes a plurality of multipliers collectively configured to shift the combinations based on an average difference between the first frequency and the second frequency.

公开(公告)号：US11356125B2

公开(公告)日：2022-06-07

申请号：US16953947

申请日：2020-11-20

Applicant: Texas Instruments Incorporated

Inventor： Jawaharlal Tangudu ,  Yeswanth Guntupalli ,  Kalyan Gudipati ,  Robert Clair Keller ,  Wenjing Lu ,  Jaiganesh Balakrishnan ,  Harsh Garg ,  Bragadeesh S ,  Raju Kharataram Chaudhari ,  Francesco Dantoni

IPC: H04B1/04 ,  H04B1/00

Abstract: An integrated circuit comprises an input, a digital step attenuator, an analog-to-digital converter, a first output, a second output, a first bandwidth filter, a first band attack detector, a first band decay detector, a second bandwidth filter, a second band attack detector, a second band decay detector, and an automatic gain control. The ADC is configured to output a digital signal including a first and a second frequency range. The first and second bandwidth filters are configured to extract respective digital signals comprising the first and second frequency ranges. The band attack and decay detectors are configured to detect band peaks or decays thereof such that the DSA and External AMP may be controlled by means of the AGC based on the detected band peaks or decays, and ADC attack and ADC decay.