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    Low-complexity inverse sinc for RF sampling transmitters
    32.
    发明授权
    Low-complexity inverse sinc for RF sampling transmitters 有权

    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.

    Dynamic IQ mismatch correction in FMCW radar
    33.
    发明授权
    Dynamic IQ mismatch correction in FMCW radar 有权

    公开(公告)号：US11428777B2

    公开(公告)日：2022-08-30

    申请号：US16208276

    申请日：2018-12-03

    Applicant: Texas Instruments Incorporated

    Inventor： Pankaj Gupta ,  Sriram Murali ,  Karthik Ramasubramanian

    IPC: G01S7/35 ,  G01S13/34 ,  H03D1/22 ,  G01S7/40 ,  H03D7/16 ,  H03D3/00 ,  G01S13/931

    Abstract: A FMCW radar receiver includes a LO providing a chirped LO signal, an in-phase (I) channel for outputting I-data and a quadrature (Q) channel for outputting Q-data. A dynamic correction parameter generator generates IQ phase correction values (P[n]s) and IQ gain correction values (G[n]s) based on a frequency slope rate of the chirped LO signal for generating during intervals of chirps including a first sequence of P[n]s and G[n]s during a first chirp and a second sequence of P[n]s and G[n]s during a second chirp. An IQ mismatch (IQMM) correction circuit has a first IQMM input coupled to receive the I-data and a second IQMM input receiving the Q-data, and the P[n]s and G[n]s. During the first chirp the IQMM correction circuit provides first Q′-data and first I′-data and during the second chirp the IQMM correction circuit provides at least second Q′-data and second I′-data.

    Digital compensation for mismatches in a radar system
    36.
    发明授权
    Digital compensation for mismatches in a radar system 有权

    公开(公告)号：US11054499B2

    公开(公告)日：2021-07-06

    申请号：US15004443

    申请日：2016-01-22

    Applicant: Texas Instruments Incorporated

    Inventor： Sriram Murali ,  Karthik Subburaj ,  Karthik Ramasubramanian

    IPC: G01S7/35 ,  G01S7/40 ,  G01S13/931

    Abstract: A radar system is provided that includes a receive channel configured to receive a reflected signal and to generate a first digital intermediate frequency (IF) signal based on the reflected signal, a reference receive channel configured to receive a reflected signal and to generate a second digital IF signal based on the reflected signal, and digital mismatch compensation circuitry coupled to receive the first digital IF signal and the second digital IF signal, the digital mismatch compensation circuitry configured to process the first digital IF signal and the second digital IF signal to compensate for mismatches between the receive channel and the reference receive channel.

    Dynamic IQ mismatch correction in FMCW radar
    37.
    发明授权
    Dynamic IQ mismatch correction in FMCW radar 有权

    公开(公告)号：US10145937B2

    公开(公告)日：2018-12-04

    申请号：US15088566

    申请日：2016-04-01

    Applicant: Texas Instruments Incorporated

    Inventor： Pankaj Gupta ,  Sriram Murali ,  Karthik Ramasubramanian

    IPC: G01S7/35 ,  G01S13/34 ,  G01S13/93 ,  G01S13/00

    Abstract: A FMCW radar receiver includes a LO providing a chirped LO signal, an in-phase (I) channel for outputting I-data and a quadrature (Q) channel for outputting Q-data. A dynamic correction parameter generator generates IQ phase correction values (P[n]s) and IQ gain correction values (G[n]s) based on a frequency slope rate of the chirped LO signal for generating during intervals of chirps including a first sequence of P[n]s and G[n]s during a first chirp and a second sequence of P[n]s and G[n]s during a second chirp. An IQ mismatch (IQMM) correction circuit has a first IQMM input coupled to receive the I-data and a second IQMM input receiving the Q-data, and the P[n]s and G[n]s. During the first chirp the IQMM correction circuit provides first Q′-data and first I′-data and during the second chirp the IQMM correction circuit provides at least second Q′-data and second I′-data.

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