公开(公告)号：US11796634B2

公开(公告)日：2023-10-24

申请号：US17513931

申请日：2021-10-29

Applicant: Texas Instruments Incorporated

Inventor： Karthik Subburaj ,  Indu Prathapan ,  Karthik Ramasubramanian ,  Brian P. Ginsburg

IPC: G01S7/40 ,  G01S13/34

CPC classification number: G01S7/4004 ,  G01S7/4008 ,  G01S7/4021 ,  G01S13/34 ,  G01S7/4013

Abstract: A FMCW radar system with a built-in self-test (BIST) system for monitoring includes a receiver, a transmitter, and a frequency synthesizer. A FMCW chirp timing engine controls timing of operations at least one radar component. The BIST system includes at least one switchable coupling for coupling a first plurality of different analog signals including from a first plurality of selected nodes in the receiver or transmitter that are all coupled to a second number of monitor analog-to-digital converters (ADCs). The second number is less than (

公开(公告)号：US20230088361A1

公开(公告)日：2023-03-23

申请号：US17989401

申请日：2022-11-17

Applicant: Texas Instruments Incorporated

Inventor： Karthik Subburaj ,  Zahir Ibrahim Parkar ,  Krishnanshu Dandu ,  Vashishth Dudhia

IPC: G01S7/40 ,  G01S13/34 ,  G01S7/35

Abstract: Methods, apparatus, systems and articles of manufacture are disclosed to test RADAR integrated circuits. A radar circuit comprising a local oscillator (LO), a transmitter coupled to the LO and configured to be coupled to a transmission network, a receiver configured to be coupled to the transmission network, and a controller coupled to the LO, the transmitter, and the receiver, the controller to cause the LO to generate a frequency modulated continuous waveform (FMCW), cause the transmitter to modulate the FMCW as a modulated FMCW, cause the transmitter to transmit the modulated FMCW via the transmission network and the receiver to obtain a received FMCW from the transmission network, and in response to obtaining the received FMCW from the receiver, generate a performance characteristic of the radar circuit based on the received FMCW.

公开(公告)号：US11366211B2

公开(公告)日：2022-06-21

申请号：US16984246

申请日：2020-08-04

Applicant: Texas Instruments Incorporated

Inventor： Sandeep Rao ,  Karthik Subburaj ,  Sriram Murali ,  Karthik Ramasubramanian

IPC: G01S13/28 ,  G06F17/14 ,  G01S7/41 ,  G01S13/536 ,  G01S13/931 ,  G01S13/34 ,  G01S7/35 ,  G06F17/13 ,  H04N5/232

Abstract: A radar system is provided that includes a radar transceiver integrated circuit (IC) configurable to transmit a first frame of chirps, and another radar transceiver IC configurable to transmit a second frame of chirps at a time delay ΔT, wherein ΔT=Tc/K, K≥2 and Tc is an elapsed time from a start of one chirp in the first frame and the second frame and a start of a next chirp in the first frame and the second frame, wherein the radar system is configured to determine a velocity of an object in a field of view of the radar system based on first digital intermediate frequency signals generated responsive to receiving reflected chirps of the first frame and second digital IF signals generated responsive to receiving reflected chirps of the time delayed second frame, wherein the maximum measurable velocity is increased by a factor of K.

公开(公告)号：US20210389418A1

公开(公告)日：2021-12-16

申请号：US17462086

申请日：2021-08-31

Applicant: Texas Instruments Incorporated

Inventor： Brian Paul Ginsburg ,  Karthik Subburaj ,  Karthik Ramasubramanian ,  Sachin Bhardwaj ,  Sriram Murali ,  Sandeep Rao

IPC: G01S7/35 ,  G01S7/40 ,  G01S13/32 ,  G01S7/02 ,  G01S13/931

Abstract: A frequency modulated continuous wave (FMCW) radar system is provided that includes a receiver configured to generate a digital intermediate frequency (IF) signal, and an interference monitoring component coupled to the receiver to receive the digital IF signal, in which the interference monitoring component is configured to monitor at least one sub-band in the digital IF signal for interference, in which the at least one sub-band does not include a radar signal.

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.

公开(公告)号：US20200379085A1

公开(公告)日：2020-12-03

申请号：US16428576

申请日：2019-05-31

Applicant: Texas Instruments Incorporated

Inventor： Karthik Subburaj ,  Zahir Ibrahim Parkar ,  Krishnanshu Dandu ,  Vashishth Dudhia

IPC: G01S7/40 ,  G01S7/35 ,  G01S13/34

Abstract: Methods, apparatus, systems and articles of manufacture are disclosed to test RADAR integrated circuits. A radar circuit comprising a local oscillator (LO), a transmitter coupled to the LO and configured to be coupled to a transmission network, a receiver configured to be coupled to the transmission network, and a controller coupled to the LO, the transmitter, and the receiver, the controller to cause the LO to generate a frequency modulated continuous waveform (FMCW), cause the transmitter to modulate the FMCW as a modulated FMCW, cause the transmitter to transmit the modulated FMCW via the transmission network and the receiver to obtain a received FMCW from the transmission network, and in response to obtaining the received FMCW from the receiver, generate a performance characteristic of the radar circuit based on the received FMCW.

公开(公告)号：US10768278B2

公开(公告)日：2020-09-08

申请号：US15333593

申请日：2016-10-25

Applicant: Texas Instruments Incorporated

Inventor： Karthik Subburaj ,  Indu Prathapan ,  Karthik Ramasubramanian ,  Brian P. Ginsburg

IPC: G01S7/40 ,  G01S13/34

Abstract: A FMCW radar system with a built-in self-test (BIST) system for monitoring includes a receiver, a transmitter, and a frequency synthesizer. A FMCW chirp timing engine controls timing of operations at least one radar component. The BIST system includes at least one switchable coupling for coupling a first plurality of different analog signals including from a first plurality of selected nodes in the receiver or transmitter that are all coupled to a second number of monitor analog-to-digital converters (ADCs). The second number is less than (

公开(公告)号：US10067221B2

公开(公告)日：2018-09-04

申请号：US14679461

申请日：2015-04-06

Applicant: Texas Instruments Incorporated

Inventor： Brian Paul Ginsburg ,  Karthik Subburaj ,  Karthik Ramasubramanian ,  Sachin Bhardwaj ,  Sriram Murali ,  Sandeep Rao

IPC: G01S7/35 ,  G01S7/40 ,  G01S13/32 ,  G01S13/93 ,  G01S7/02 ,  G01S13/00

Abstract: A frequency modulated continuous wave (FMCW) radar system is provided that includes a receiver configured to generate a digital intermediate frequency (IF) signal, and an interference monitoring component coupled to the receiver to receive the digital IF signal, in which the interference monitoring component is configured to monitor at least one sub-band in the digital IF signal for interference, in which the at least one sub-band does not include a radar signal.

公开(公告)号：US10048354B2

公开(公告)日：2018-08-14

申请号：US14826045

申请日：2015-08-13

Applicant: Texas Instruments Incorporated

Inventor： Sachin Bharadwaj ,  Karthik Subburaj

IPC: G01S7/35 ,  G01S13/42 ,  G01S13/58 ,  G01S7/40 ,  G01S13/34 ,  H03L7/06

Abstract: The disclosure provides a radar apparatus. The radar apparatus includes a transmit unit that generates a first signal in response to a reference clock and a feedback clock. The first signal is scattered by one or more obstacles to generate a second signal. A receive unit receives the second signal and generates N samples corresponding to the second signal. N is an integer. A conditioning circuit is coupled to the transmit unit and the receive unit. The conditioning circuit receives the N samples corresponding to the second signal, and generates N new samples using an error between the feedback clock and the reference clock.

公开(公告)号：US20180074168A1

公开(公告)日：2018-03-15

申请号：US14687617

申请日：2015-04-15

Applicant: Texas Instruments Incorporated

Inventor： Karthik Subburaj ,  Karthik Ramasubramanian ,  Sriram Murali ,  Sreekiran Samala ,  Krishnanshu Dandu

IPC: G01S7/292 ,  G01S7/41

CPC classification number: G01S7/292 ,  G01S7/023 ,  G01S7/038 ,  G01S7/354 ,  G01S7/414 ,  G01S13/003 ,  G01S13/04 ,  G01S13/343 ,  G01S13/88 ,  G01S2007/356 ,  G01S2007/358

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.