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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
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.
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公开(公告)号：US11137476B2
公开(公告)日：2021-10-05
申请号：US16120129
申请日：2018-08-31
Applicant: Texas Instruments Incorporated
Inventor： Brian Paul Ginsburg , Karthik Subburaj , Karthik Ramasubramanian , Sachin Bhardwaj , Sriram Murali , Sandeep Rao
IPC: G01S7/35 , G01S7/02 , G01S7/40 , G01S13/32 , 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.
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53.发明授权公开(公告)号：US11047970B2
公开(公告)日：2021-06-29
申请号：US15587564
申请日：2017-05-05
Applicant: Texas Instruments Incorporated
Inventor： Sachin Bharadwaj , Sriram Murali
IPC: G01S13/42 , G01S13/931 , G01S13/34 , G01S13/58 , G01S7/288
Abstract: A multi-mode radar system, radar signal processing methods and configuration methods, including using predetermined, range/mode-specific pushing windows to perform windowing on range and velocity object data before performing an FFT on the windowed object data matrix to generate a three-dimensional object matrix including range, velocity and angle data. The individual windows have an angular spectral response that corresponds to a combined angular coverage field of view of the transmit and receive antennas for the corresponding mode to minimize the total weighted energy outside the main lobe and to provide increasing spectral leakage outside the combined angular coverage field of view with angular offset from the main lobe to push out much of the spectral leakage into regions where leakage tolerance is high due to the corresponding combined angular coverage field of view of the transmit and receive antennas.
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公开(公告)号：US20210026005A1
公开(公告)日：2021-01-28
申请号：US17068976
申请日：2020-10-13
Applicant: Texas Instruments Incorporated
Inventor： Sachin Bharadwaj , Karthik Subburaj , Sriram Murali
Abstract: A radar system is provided that includes transmission signal generation circuitry, a transmit channel coupled to the transmission generation circuitry to receive a continuous wave test signal, the transmit channel configurable to output a test signal based on the continuous wave signal in which a phase angle of the test signal is changed in discrete steps within a phase angle range, a receive channel coupled to the transmit channel via a feedback loop to receive the test signal, the receive channel including an in-phase (I) channel and a quadrature (Q) channel, a statistics collection module configured to collect energy measurements of the test signal output by the I channel and the test signal output by the Q channel at each phase angle, and a processor configured to estimate phase and gain imbalance of the I channel and the Q channel based on the collected energy measurements.
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公开(公告)号：US10812091B2
公开(公告)日：2020-10-20
申请号：US16837537
申请日：2020-04-01
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sundarrajan Rangachari , Sriram Murali , Sanjay Pennam
Abstract: A method for dithering a fractional clock divider includes generating a first clock enable sequence based on a seed pattern of M ones and N minus M zeros, selecting a cyclic rotation of the seed pattern after N input clock cycles, and generating a second clock enable sequence based on the cyclic rotation. A clock gate receives the input clock signal and the clock enable sequences and outputs M clock cycles for every N input clock cycles. A random number generator indicates the cyclic rotation of the seed pattern. The seed pattern can be replaced with an updated seed pattern of M ones and N minus M zeros in a different order. In some examples, the clock enable sequence is generated using a cyclic shift register containing the seed pattern and a multiplexor. In other examples, the clock enable sequence is generated using a modulo N counter and a comparator.
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Patent Agency Ranking
公开(公告)号：US10809353B2
公开(公告)日：2020-10-20
申请号：US16114490
申请日：2018-08-28
Applicant: Texas Instruments Incorporated
Inventor： Karthik Subburaj , Karthik Ramasubramanian , Sriram Murali , Sreekiran Samala , Krishnanshu Dandu
IPC: G01S13/00 , G01S7/292 , G01S13/88 , G01S7/35 , G01S13/34 , G01S7/03 , G01S7/02 , G01S7/41 , 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：US10775489B2
公开(公告)日：2020-09-15
申请号：US15665663
申请日：2017-08-01
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.
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公开(公告)号：US20200025871A1
公开(公告)日：2020-01-23
申请号：US16114490
申请日：2018-08-28
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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公开(公告)号：US20180172813A1
公开(公告)日：2018-06-21
申请号：US15665663
申请日：2017-08-01
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Rao , Karthik Subburaj , Sriram Murali , Karthik Ramasubramanian
CPC classification number: G01S13/282 , G01S7/354 , G01S7/415 , G01S13/343 , G01S13/536 , G01S13/931 , G01S2007/356 , G06F17/13 , G06F17/142 , H04N5/23296
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.
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公开(公告)号：US20180156910A1
公开(公告)日：2018-06-07
申请号：US15638106
申请日：2017-06-29
Applicant: Texas Instruments Incorporated
Inventor： Sachin Bharadwaj , Karthik Subburaj , Sriram Murali
Abstract: A radar system is provided that includes transmission signal generation circuitry, a transmit channel coupled to the transmission generation circuitry to receive a continuous wave test signal, the transmit channel configurable to output a test signal based on the continuous wave signal in which a phase angle of the test signal is changed in discrete steps within a phase angle range, a receive channel coupled to the transmit channel via a feedback loop to receive the test signal, the receive channel including an in-phase (I) channel and a quadrature (Q) channel, a statistics collection module configured to collect energy measurements of the test signal output by the I channel and the test signal output by the Q channel at each phase angle, and a processor configured to estimate phase and gain imbalance of the I channel and the Q channel based on the collected energy measurements.
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