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公开(公告)号：US12260187B2
公开(公告)日：2025-03-25
申请号：US17357919
申请日：2021-06-24
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Shailesh Joshi , Karthik Subburaj , Karthik Ramasubramanian
Abstract: A device includes a comparison circuit and a calculation circuit coupled to the comparison circuit. The comparison circuit is configured to receive a first digital input value (X) and a second digital input value (Y), and provide a first digital output value that indicates one of a first relationship, a second relationship, and a third relationship between X and Y. The calculation circuit is configured to receive X and Y, receive the first digital output value, and provide a second digital output value. The second digital output value is a first linear combination of X and Y responsive to the first digital output value indicating the first relationship, a second linear combination of X and Y responsive to the first digital output value indicating the second relationship, and a third linear combination of X and Y responsive to the first digital output value indicating the third relationship.
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公开(公告)号：US11874392B2
公开(公告)日：2024-01-16
申请号：US17498342
申请日：2021-10-11
Applicant: Texas Instruments Incorporated
Inventor： Shankar Ram Narayana Moorthy , Karthik Subburaj , Shailesh Joshi , Piyush Soni
CPC classification number: G01S7/2813 , G01S7/352
Abstract: A non-transitory computer-readable storage device stores machine instructions which, when executed by a processor, cause the processor to determine a chirp period Tc for radar chirps in a radar frame. The chirp period Tc comprises a rising period Trise and a falling period Tfall. The processor determines, for each radar chirp in the radar frame, a corresponding randomized frequency characteristic during Tfall, and causes a radar sensor circuit to generate the radar chirps in the radar frame based on Tc, Trise, Tfall, and the corresponding randomized frequency characteristics. In some implementations, the machine instructions to determine the corresponding randomized frequency characteristic comprise machine instructions to determine a frequency step having a frequency f_step and a period Tstep. At least one of the frequency f_step and the period Tstep is dithered across radar chirps in the radar frame.
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公开(公告)号：US11630185B2
公开(公告)日：2023-04-18
申请号：US17097390
申请日：2020-11-13
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Karthik Subburaj , Vashishth Dudhia , Shailesh Joshi
IPC: G01S7/40
Abstract: A method for calibrating a cascaded radar system includes transmitting first radar transmission signal from a radar device. First radar reflection signals corresponding to the respective first radar transmission signal reflected from calibration target are received at each of the radar devices. The first radar reflection signals are demodulated to generate first baseband signals at each of the radar devices. A second radar transmission signal is modulated with respect to the first radar transmission signal at the respective one of the radar devices. The second radar transmission signal is transmitted from the respective one of the radar devices and are received as second radar reflection signals at each of the radar devices. The second radar reflection signals are demodulated to generate second baseband signals at each of the radar devices, and each of the radar devices are calibrated based on the first and second baseband signals.
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Patent Agency Ranking
公开(公告)号：US12007462B2
公开(公告)日：2024-06-11
申请号：US17351654
申请日：2021-06-18
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Karthik Subburaj , Karthik Ramasubramanian , Shailesh Joshi , Kameswaran Vengattaramane , Indu Prathapan
IPC: G01S13/04 , G01S7/35 , G06F16/22 , G06F16/901 , G06F17/14
CPC classification number: G01S13/04 , G01S7/35 , G06F16/2264 , G06F16/9017 , G06F17/142
Abstract: A system includes a memory configured to store a two-dimensional data structure that includes radar data arranged such that radar data of a first transmitter is separated from radar data of a second transmitter by a Doppler offset in the two-dimensional data structure. The system also includes a data fetch mechanism that includes a lookup table (LUT) applied on either of two dimensions. The lookup table is configured to store a data fetch location in the two-dimensional data structure, where the data fetch location indicates a location from which to fetch a subset of the radar data from the two-dimensional data structure and the data fetch mechanism is configured to fetch the subset of the radar data from the two-dimensional data structure based on the LUT. The system includes a processor configured to perform a fast Fourier transform (FFT) on the fetched subset of the radar data.
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公开(公告)号：US12228680B2
公开(公告)日：2025-02-18
申请号：US17862738
申请日：2022-07-12
Applicant: Texas Instruments Incorporated
Inventor： Karthik Subburaj , Shankar Narayanamoorthy , Karthik Ramasubramanian , Anand Gadiyar , Dheeraj Kumar Shetty , Shailesh Joshi
IPC: G01S7/40
Abstract: Methods, apparatus, systems and articles of manufacture to compensate radar system calibration are disclosed. A radio-frequency (RF) subsystem having a transmit channel, a receive channel, and a loopback path comprising at least a portion of the transmit channel and at least a portion of the receive channel, a loopback measurer to measure a first loopback response of the RF subsystem for a first calibration configuration of the RF subsystem, and to measure a second loopback response of the RF subsystem for a second calibration configuration of the RF subsystem, and a compensator to adjust at least one of a transmit programmable shifter or a digital front end based on a difference between the first loopback response and the second loopback response to compensate for a loopback response change when the RF subsystem is changed from the first calibration configuration to the second calibration configuration.
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公开(公告)号：US12078749B2
公开(公告)日：2024-09-03
申请号：US18181938
申请日：2023-03-10
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Karthik Subburaj , Vashishth Dudhia , Shailesh Joshi
CPC classification number: G01S7/40 , G01S7/352 , G01S7/4021 , G01S7/4073 , G01S13/341 , G01S7/4017
Abstract: An example radar device includes an antenna system, a transmitter having an input, and an output coupled to an input of the antenna system, the transmitter having modulation circuitry to provide frequency modulated continuous wave (FMCW) signals for transmission by the antenna system; a receive signal processing chain; and a digital front-end. The receive signal processing chain includes an input coupled to an output of the antenna system, and is configured to receive radar reflection signals, process the radar reflected signals to generate an intermediate frequency (IF) baseband signal, and digitize the IF baseband signal to generate digital samples of the IF baseband signal. The digital front-end has an input to receive the digital samples of the IF baseband signal and to phase-shift the digital samples in response to a calibration signal.
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公开(公告)号：US12021552B2
公开(公告)日：2024-06-25
申请号：US17566047
申请日：2021-12-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Karthik Subburaj , Pranav Sinha , Mayank Kumar Singh , Rittu Sachdev , Karan Singh Bhatia , Shailesh Joshi , Indu Prathapan
CPC classification number: H04B1/0075 , H04B1/04 , H04B1/1036 , H04B1/69 , H04B2001/0408 , H04B2001/1045 , H04B2001/1063 , H04B2001/6912
Abstract: A device comprises a digital ramp generator, an oscillator, a power amplifier, a low-noise amplifier (LNA), a mixer, and an intermediate frequency amplifier (IFA). The oscillator generates a chirp signal based on an output from the digital ramp generator. The power amplifier receives the chirp signal and outputs an amplified chirp signal to a transmitter antenna. The LNA receives a reflected chirp signal from a receiver antenna. The mixer receives output of the LNA and combines it with the chirp signal from the oscillator. The IFA receives the mixer output signal and includes a configurable high-pass filter, which has a first cutoff frequency during a first portion of the chirp signal and a second cutoff frequency during a second portion of the chirp signal. In some implementations, the first cutoff frequency is chosen based on a frequency of a blocker signal introduced by couplings between the transmitter and receiver antennas.
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公开(公告)号：US20230204717A1
公开(公告)日：2023-06-29
申请号：US17862738
申请日：2022-07-12
Applicant: Texas Instruments Incorporated
Inventor： Karthik Subburaj , Shankar Narayanamoorthy , Karthik Ramasubramanian , Anand Gadiyar , Dheeraj Kumar Shetty , Shailesh Joshi
IPC: G01S7/40
CPC classification number: G01S7/40 , G01S7/4021 , G01S7/4008
Abstract: Methods, apparatus, systems and articles of manufacture to compensate radar system calibration are disclosed. A radio-frequency (RF) subsystem having a transmit channel, a receive channel, and a loopback path comprising at least a portion of the transmit channel and at least a portion of the receive channel, a loopback measurer to measure a first loopback response of the RF subsystem for a first calibration configuration of the RF subsystem, and to measure a second loopback response of the RF subsystem for a second calibration configuration of the RF subsystem, and a compensator to adjust at least one of a transmit programmable shifter or a digital front end based on a difference between the first loopback response and the second loopback response to compensate for a loopback response change when the RF subsystem is changed from the first calibration configuration to the second calibration configuration.
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