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公开(公告)号：US11489517B2
公开(公告)日：2022-11-01
申请号：US17558794
申请日：2021-12-22
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sriram Murali , Jaiganesh Balakrishnan , Ram Narayan Krishna Nama Mony , Pooja Sundar
Abstract: A circuit includes a noise generator and a delay element. The output of the noise generator couples to the input of the delay element. The output of the delay element is coupled to a first input of a logic circuit, and the output of the noise generator is coupled to a second input of the logic circuit. The output of the logic circuit is coupled to a first control input of a waveform storage circuit. The waveform storage circuit is configured to produce a first digital waveform on its output responsive to a first logic state on the output of the logic circuit and to produce a second digital waveform on its output responsive to a second logic state on the output of the logic circuit. A sequencer has a sequencer output coupled to the second control input of the waveform storage circuit.
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公开(公告)号：US11476857B2
公开(公告)日：2022-10-18
申请号：US17072225
申请日：2020-10-16
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rahul Sharma , Aswath Vs , Sriram Murali , Prasad Gandewar , Sandeep Kesrimal Oswal
Abstract: Analog gain correction circuitry and analog switching clock edge timing correction circuitry can provide coarse correction of interleaving errors in radio-frequency digital-to-analog converters (RF DACs), such as may be used in 5G wireless base stations. The analog correction can be supplemented by digital circuitry configured to “pre-cancel” an interleaving image by adding to a digital DAC input signal a signal equal and opposite to an interleaving image created by the interleaving DAC, such that the interleaving image is effectively mitigated. Error correction control parameters can be periodically adjusted for changes in temperature by a controller coupled to an on-chip temperature sensor. A model useful for understanding the sources of error in interleaving DACs is also described.
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公开(公告)号：US20210333357A1
公开(公告)日：2021-10-28
申请号：US17368319
申请日：2021-07-06
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.
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公开(公告)号：US20190011533A1
公开(公告)日：2019-01-10
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
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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15.发明申请公开(公告)号：US20180321368A1
公开(公告)日：2018-11-08
申请号：US15587564
申请日：2017-05-05
Applicant: Texas Instruments Incorporated
Inventor： Sachin Bharadwaj , Sriram Murali
CPC classification number: G01S13/42 , G01S7/288 , G01S13/583 , G01S2007/2883
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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Patent Agency Ranking
公开(公告)号：US10101438B2
公开(公告)日：2018-10-16
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
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：US20160165536A1
公开(公告)日：2016-06-09
申请号：US14560011
申请日：2014-12-04
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sriram Murali , Sarma Gunturi , Jaiganesh Balakrishnan , Murugesh Subramaniam , Harikrishna Parthasarathy
CPC classification number: H04W52/028 , H04B1/44 , H04L5/16 , H04L25/4902 , H04L27/14 , H04W76/28 , Y02D70/1262 , Y02D70/142 , Y02D70/168
Abstract: Circuits and methods for reducing power consumption in a half-duplex transceiver are disclosed. In an embodiment, a power management circuit of half-duplex transceiver includes direct current to direct current (DC-DC) converter and snooze mode controller. The DC-DC converter includes switching circuit and driver circuit to drive the switching circuit. The DC-DC converter provides power supply to at least one element of a transmitter sub-system of the half-duplex transceiver, and operates in snooze control modes. The snooze mode controller is coupled to the DC-DC converter and configured to generate a control signal based on at least one transceiver operating input, where the control signal causes the DC-DC converter to operate in one of the snooze control modes, the snooze control modes corresponding to snooze duty cycles and where in each snooze control mode, the switching circuit and the driver circuit remain in an OFF-state based on a respective snooze duty cycle.
Abstract translation: 公开了一种用于降低半双工收发器功耗的电路和方法。 在一个实施例中，半双工收发器的功率管理电路包括直流到直流（DC-DC）转换器和打盹模式控制器。 DC-DC转换器包括开关电路和驱动电路来驱动开关电路。 DC-DC转换器为半双工收发器的发射机子系统的至少一个元件提供电源，并且以贪睡控制模式操作。 打盹模式控制器耦合到DC-DC转换器，并被配置为基于至少一个收发器操作输入产生控制信号，其中控制信号使DC-DC转换器以打盹控制模式之一进行操作，打盹 对应于打盹占空比的控制模式，并且在每个打盹控制模式中，基于相应的打盹占空比，开关电路和驱动电路保持在OFF状态。
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公开(公告)号：US20160127161A1
公开(公告)日：2016-05-05
申请号：US14528660
申请日：2014-10-30
Applicant: Texas Instruments Incorporated
Inventor： Sriram Murali , Indu Prathapan , Pankaj Gupta , Zahir Ibrahim Parkar , Sundarrajan Rangachari
IPC: H04L27/156 , H04L27/38 , H04L27/34 , H04L27/14
CPC classification number: H04L27/1566 , H04L27/3455 , H04W52/0229 , Y02D70/00
Abstract: A weather band receiver, which may be part of an FM receiver, is disclosed. FSK-encoded data units in an alert packet transmission are detected using a quadrature matched filter circuit. At least one FSK-encoded data unit is captured from the alert packet transmission. Soft quantized bits are extracted from the FSK-encoded data units. The soft quantized bits are saved to memory and used to recover an alert message. Soft quantized bits from two or more FSK-encoded data units may be combined before recovering the alert message.
Abstract translation: 公开了可以是FM接收机的一部分的气象带接收机。 使用正交匹配滤波器电路检测警报分组传输中的FSK编码数据单元。 从警报包传输中捕获至少一个FSK编码的数据单元。 从FSK编码数据单元提取软量化比特。 软量化位保存到存储器中，用于恢复警报消息。 可以在恢复警报消息之前组合来自两个或更多个FSK编码数据单元的软量化比特。
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公开(公告)号：US08825397B2
公开(公告)日：2014-09-02
申请号：US13668381
申请日：2012-11-05
Applicant: Texas Instruments Incorporated
Inventor： Sandeep Kasargod , Sandeep Rao , Karthik Ramasubramanian , Tarkesh Pande , Sriram Murali
CPC classification number: G01C21/12 , G01C21/165 , G01S19/42 , G01S19/45
Abstract: A vehicle navigation system includes a GNSS position engine (GPE) that uses GNSS satellite measurements to compute a first position and velocity of a vehicle and a first quality metric associated with the position and velocity. The system also includes a dead reckoning engine (DRE) that operates parallel with the GPE that computes a second position and velocity and a second quality metric associated with the dead reckoning. The GPE is configured to use the second position and velocity to detect a set of outliers in an incoming GNSS measurement; use the second position and velocity as an initial estimate of its position and velocity for a particular time instant, which is then refined by GNSS measurements received at that particular time instant; and to replace the first position and velocity with the second position and velocity.
Abstract translation: 车辆导航系统包括使用GNSS卫星测量来计算车辆的第一位置和速度以及与位置和速度相关联的第一质量度量的GNSS位置引擎（GPE）。 该系统还包括与计算第二位置和速度的GPE并行运行的航位推算引擎（DRE），以及与推算相关联的第二质量度量。 GPE被配置为使用第二位置和速度来检测进入GNSS测量中的一组异常值; 使用第二位置和速度作为其在特定时间瞬间的位置和速度的初始估计，然后通过在该特定时刻接收的GNSS测量来改进; 并用第二位置和速度来替换第一位置和速度。
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公开(公告)号：US20240364569A1
公开(公告)日：2024-10-31
申请号：US18632062
申请日：2024-04-10
Applicant: Texas Instruments Incorporated
Inventor： Raju Kharataram Chaudhari , Aswath VS , Sriram Murali , Jaiganesh Balakrishnan , Sreenath Narayanan Potty , Kapil Kumar
CPC classification number: H04L27/2618 , H04B1/0475
Abstract: An example apparatus includes: crest factor reduction circuitry having a signal input and a peak cancellation waveform input; and peak cancellation waveform generator circuitry including: carrier profile analyzer circuitry having a signal input coupled to the signal input of the crest factor reduction circuitry, and having a carrier profile output; waveform construction circuitry having a carrier profile input coupled to the carrier profile output of the carrier profile analyzer circuitry, having a second input, and having a peak cancellation waveform output coupled to the peak cancellation waveform input of the crest factor reduction circuitry; and profile change detector circuitry having a carrier profile input coupled to the carrier profile output of the carrier profile analyzer circuitry, and having an output coupled to the second input of the waveform construction circuitry.
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