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公开(公告)号：US11789137B2
公开(公告)日：2023-10-17
申请号：US17138549
申请日：2020-12-30
Applicant: Texas Instruments Incorporated
Inventor： Karthik Subburaj , Sreekiran Samala , Indu Prathapan
CPC classification number: G01S13/345 , G01S7/032 , G01S7/352 , H03C3/0925 , H03L7/087 , H03L7/099
Abstract: In described examples, a frequency modulated continuous wave (FMCW) synthesizer includes a control engine, and a phase locked loop (PLL) including a frequency divider, a control voltage generator (CVG), and a voltage controlled oscillator (VCO). The frequency divider modifies a VCO output frequency based on a control input. The CVG generates a control voltage based on a frequency reference and the frequency divider output. The VCO outputs a FMCW output having the VCO output frequency in response to the control voltage. The control engine generates the control input so that the VCO output frequency: from a first time to a second time, is a first frequency; from the second time to a third time, changes at a first rate; from the third time to a fourth time, changes at a second rate different from the first rate; and from the fourth time to a fifth time, is a second frequency.
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公开(公告)号：US11747436B2
公开(公告)日：2023-09-05
申请号：US17020931
申请日：2020-09-15
Applicant: Texas Instruments Incorporated
Inventor： Karthik Subburaj , Karthik Ramasubramanian , Sriram Murali , Sreekiran Samala , Krishnanshu Dandu
IPC: G01S7/292 , G01S13/88 , G01S13/00 , G01S7/35 , G01S13/34 , G01S7/03 , G01S7/02 , G01S7/41 , G01S13/04
CPC classification number: G01S7/292 , G01S7/023 , G01S7/038 , G01S7/354 , G01S7/414 , G01S13/003 , G01S13/343 , G01S13/88 , G01S7/356 , G01S7/358 , G01S13/04
Abstract: A noise-mitigated continuous-wave frequency-modulated radar includes, for example, a transmitter for generating a radar signal, a receiver for receiving a reflected radar signal and comprising a mixer for generating a baseband signal in response to the received radar signal and in response to a local oscillator (LO) signal, and a signal shifter coupled to at least one of the transmitter, LO input of the mixer in the receiver and the baseband signal generated by the mixer. The impact of amplitude noise or phase noise associated with interferers, namely, for example, strong reflections from nearby objects, and electromagnetic coupling from transmit antenna to receive antenna, on the detection of other surrounding objects is reduced by configuring the signal shifter in response to an interferer frequency and phase offset.
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公开(公告)号：US11486916B2
公开(公告)日：2022-11-01
申请号：US17515637
申请日：2021-11-01
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Tom Altus , Karthik Subburaj , Sreekiran Samala , Raghu Ganesan
Abstract: A method of frequency estimation. A clock output from a frequency synthesizer is received at an input of a ring encoder. The ring encoder generates outputs including a ring encoder output clock and an encoded output which represents LSBs of a clock cycle count of the clock output. A binary counter is run using the ring encoder output clock which provides an output count which represents MSBs of the clock cycle count. Using a reference clock, the encoded output is sampled to provide a sampled encoded output and the output count is sampled to provide a sampled output count. Error correcting is applied to the sampled encoded output to provide a corrected sampled encoded output. The corrected sampled encoded output and sampled output count are combined to provide a combined output which is used for estimating an instantaneous or average frequency of the clock output.
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44.发明授权公开(公告)号：US11378649B2
公开(公告)日：2022-07-05
申请号：US16814531
申请日：2020-03-10
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Karthik Subburaj , Dan Wang , Adeel Ahmad
Abstract: In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (φd) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using φd to generate a corrected virtual array vector Sc. A first Fourier transform is performed on the corrected virtual array vector Sc to generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.
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公开(公告)号：US11035928B2
公开(公告)日：2021-06-15
申请号：US15642880
申请日：2017-07-06
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Karthik Subburaj , Brian Ginsburg , Karthik Ramasubramanian
IPC: G01S7/03 , G01S7/40 , G01S13/87 , H04L7/04 , G01S13/931
Abstract: The disclosure provides a radar apparatus for estimating a position and a velocity of a plurality of obstacles. The radar apparatus includes a slave radar chip. A master radar chip is coupled to the slave radar chip. The master radar chip includes a local oscillator that generates a transmit signal. The slave radar chip receives the transmit signal on a first path and sends the transmit signal back to the master radar chip on a second path. A delay detect circuit is coupled to the local oscillator and receives the transmit signal from the slave radar chip on the second path and the transmit signal from the local oscillator. The delay detect circuit estimates a routing delay from the transmit signal received from the slave radar chip on the second path and from the transmit signal received from the local oscillator.
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Patent Agency Ranking
公开(公告)号：US20210011118A1
公开(公告)日：2021-01-14
申请号：US17020931
申请日：2020-09-15
Applicant: Texas Instruments Incorporated
Inventor： Karthik Subburaj , Karthik Ramasubramanian , Sriram Murali , Sreekiran Samala , Krishnanshu Dandu
Abstract: A noise-mitigated continuous-wave frequency-modulated radar includes, for example, a transmitter for generating a radar signal, a receiver for receiving a reflected radar signal and comprising a mixer for generating a baseband signal in response to the received radar signal and in response to a local oscillator (LO) signal, and a signal shifter coupled to at least one of the transmitter, LO input of the mixer in the receiver and the baseband signal generated by the mixer. The impact of amplitude noise or phase noise associated with interferers, namely, for example, strong reflections from nearby objects, and electromagnetic coupling from transmit antenna to receive antenna, on the detection of other surrounding objects is reduced by configuring the signal shifter in response to an interferer frequency and phase offset.
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47.发明授权公开(公告)号：US10746851B2
公开(公告)日：2020-08-18
申请号：US14975416
申请日：2015-12-18
Applicant: Texas Instruments Incorporated
Abstract: A testing device for FMCW radar includes an input for receiving a chirp signal generated by the radar. An IQ down-converter coupled to the input down-converts the chirp signal. A digitizer extracts digitized IQ signals from the down-converted chirp signal. A processor coupled to the digitizer determines at least one of frequency linearity and phase noise of the chirp signal.
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公开(公告)号：US20200209353A1
公开(公告)日：2020-07-02
申请号：US16816588
申请日：2020-03-12
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Karthik Subburaj , Brian Paul Ginsburg , Daniel Colum Breen , Sandeep Rao , Karthik Ramasubramanian
IPC: G01S7/40 , G01S13/931 , G01S7/35 , G01S7/03
Abstract: Methods for monitoring of performance parameters of one or more receive channels and/or one or more transmit channels of a radar system-on-a-chip (SOC) are provided. The radar SOC may include a loopback path coupling at least one transmit channel to at least one receive channel to provide a test signal from the at least one transmit channel to the at least one receive channel when the radar SOC is operated in test mode. In some embodiments, the loopback path includes a combiner coupled to each of one or more transmit channels, a splitter coupled to each of one or more receive channels, and a single wire coupling an output of the combiner to an input of the splitter.
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49.发明申请公开(公告)号：US20200209352A1
公开(公告)日：2020-07-02
申请号：US16814531
申请日：2020-03-10
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Karthik Subburaj , Dan Wang , Adeel Ahmad
Abstract: In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (φd) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using φd to generate a corrected virtual array vector Sc. A first Fourier transform is performed on the corrected virtual array vector Sc to generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.
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公开(公告)号：US10481187B2
公开(公告)日：2019-11-19
申请号：US14588014
申请日：2014-12-31
Applicant: Texas Instruments Incorporated
Inventor： Tom Altus , Karthik Subburaj , Sreekiran Samala , Raghu Ganesan
Abstract: A method of frequency estimation. A clock output from a frequency synthesizer is received at an input of a ring encoder. The ring encoder generates outputs including a ring encoder output clock and an encoded output which represents LSBs of a clock cycle count of the clock output. A binary counter is run using the ring encoder output clock which provides an output count which represents MSBs of the clock cycle count. Using a reference clock, the encoded output is sampled to provide a sampled encoded output and the output count is sampled to provide a sampled output count. Error correcting is applied to the sampled encoded output to provide a corrected sampled encoded output. The corrected sampled encoded output and sampled output count are combined to provide a combined output which is used for estimating an instantaneous or average frequency of the clock output.
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