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公开(公告)号：US11784660B2
公开(公告)日：2023-10-10
申请号：US17589533
申请日：2022-01-31
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Nagarajan Viswanathan , Himanshu Varshney , Vinam Arora , Charls Babu , Srinivas Kumar Naru
CPC classification number: H03M1/502 , H03M1/1009 , H03M1/362
Abstract: In an example, a system includes an input channel and a voltage to delay converter (V2D) coupled to the input channel. The system also includes a first multiplexer coupled to the V2D and an analog-to-digital converter (ADC) coupled to the first multiplexer. The system includes a second multiplexer coupled to the input channel and an auxiliary ADC coupled to the second multiplexer. The system includes calibration circuitry coupled to an output of the auxiliary ADC, where the calibration circuitry is configured to correct a non-linearity in a signal provided by the input channel. The calibration circuitry is also configured to determine the non-linearity of the signal provided to the ADC relative to the signal provided to the auxiliary ADC.
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公开(公告)号：US10892835B2
公开(公告)日：2021-01-12
申请号：US16058007
申请日：2018-08-08
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Shagun Dusad , Nagarajan Viswanathan
IPC: H04B17/309 , H04L1/24 , H04L25/02 , H04B17/336 , H04L1/20
Abstract: A system includes a pseudorandom binary sequence (PRBS) generator configured to generate a first PRBS and a second PRBS and an exclusive-OR logic configured to exclusive-OR the first PRBS and the second PRBS to compute a third PRBS. The system also includes an adder, a correlator and a corrector. The adder adds the third PRBS to input data to compute summed data for transmission of the summed data across the channel. The correlator computes the exclusive-OR of the first PRBS and the second PRBS to reproduce the third PRBS and correlates output data from the channel to the reproduced third PRBS to compute a channel gain error and a channel memory error. The corrector extracts the input data from the output data from the channel using the computed channel gain and memory errors.
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3.发明授权公开(公告)号：US10281357B2
公开(公告)日：2019-05-07
申请号：US15587190
申请日：2017-05-04
Applicant: Texas Instruments Incorporated
Inventor： Nagarajan Viswanathan
IPC: G01M11/00
Abstract: Optical time domain reflectometer (OTDR) systems, methods and integrated circuits are presented for locating defects in an optical cable or other optical cable, in which a first optical signal is transmitted to the cable and reflections are sampled over a first time range at a first sample rate to identify one or more suspected defect locations, and a second optical signal is transmitted and corresponding reflections are sampled over a second smaller time range at a higher second sample rate to identify at least one defect location of the optical cable for relaxed memory requirements in the OTDR system.
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4.发明申请公开(公告)号：US20170234768A1
公开(公告)日：2017-08-17
申请号：US15587190
申请日：2017-05-04
Applicant: Texas Instruments Incorporated
Inventor： Nagarajan Viswanathan
IPC: G01M11/00
CPC classification number: G01M11/3145
Abstract: Optical time domain reflectometer (OTDR) systems, methods and integrated circuits are presented for locating defects in an optical cable or other optical cable, in which a first optical signal is transmitted to the cable and reflections are sampled over a first time range at a first sample rate to identify one or more suspected defect locations, and a second optical signal is transmitted and corresponding reflections are sampled over a second smaller time range at a higher second sample rate to identify at least one defect location of the optical cable for relaxed memory requirements in the OTDR system.
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公开(公告)号：US10930362B2
公开(公告)日：2021-02-23
申请号：US16916911
申请日：2020-06-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Aravind Ganesan , Jaiganesh Balakrishnan , Nagarajan Viswanathan , Yeswanth Guntupalli , Ajai Paulose , Mathews John , Jagannathan Venkataraman , Neeraj Shrivastava
Abstract: A one-time write, read-only memory for storing trimming parameters includes an address pointer table, a fixed packet portion, and a flexible packet portion. The fixed packet portion includes one or more fixed packets, each fixed packet including trimming parameters for a component identified for trimming during a design phase. The flexible packet portion includes one or more flexible packets of different types. Each flexible packet includes trimming parameters for a component identified for trimming after the design phase. One packet type includes a length section and a number of fields equal to a value stored in the length section. Each field includes an address, a trimming parameter, and a mask. Another packet type includes trimming parameters associated with operands in operating instructions for a microcontroller, where the operands include an address and a mask.
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Patent Agency Ranking
公开(公告)号：US10530378B1
公开(公告)日：2020-01-07
申请号：US16249927
申请日：2019-01-17
Applicant: Texas Instruments Incorporated
IPC: H03M1/06
Abstract: The disclosure provides a circuit. The circuit includes a zone detection block that generates a control signal in response to an input signal. An amplifier generates an amplified signal in response to the input signal and the control signal. An analog to digital converter (ADC) is coupled to the amplifier and samples the amplified signal to generate a digital signal. A digital corrector is coupled to the zone detection block and the ADC, and transforms the digital signal to generate a rectified signal based on the control signal and an error signal. An error estimator is coupled to the zone detection block and receives the rectified signal as a feedback. The error estimator generates the error signal in response to the control signal and the rectified signal.
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公开(公告)号：US09438335B2
公开(公告)日：2016-09-06
申请号：US14579380
申请日：2014-12-22
Applicant: Texas Instruments Incorporated
Inventor： Nagarajan Viswanathan
IPC: H04B10/08 , H04B10/071 , G01M11/00
CPC classification number: H04B10/071 , G01M11/3109 , G01M11/3118 , G01M11/3127
Abstract: An optical data transmitter is operable to transmit data other than test data on an optical fiber at a first wavelength and an optical time domain reflectometer is operable to receive data from the optical fiber at the first wavelength and to use the received data at the first wavelength to determine whether a defect exists in the optical fiber.
Abstract translation: 光学数据发射器可操作以在第一波长的光纤上发送除测试数据之外的数据，并且光学时域反射计可操作以从第一波长的光纤接收数据，并使用第一波长的接收数据 以确定光纤中是否存在缺陷。
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公开(公告)号：US10075250B2
公开(公告)日：2018-09-11
申请号：US15395783
申请日：2016-12-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Shagun Dusad , Nagarajan Viswanathan
IPC: H04B17/309 , H04L1/24 , H04L25/02 , H04B17/336
CPC classification number: H04B17/336 , H04B17/309 , H04L1/20 , H04L1/244 , H04L25/0202 , H04L25/0226
Abstract: A system includes a pseudorandom binary sequence (PRBS) generator configured to generate a first PRBS and a second PRBS and an exclusive-OR logic configured to exclusive-OR the first PRBS and the second PRBS to compute a third PRBS. The system also includes an adder, a correlator and a corrector. The adder adds the third PRBS to input data to compute summed data for transmission of the summed data across the channel. The correlator computes the exclusive-OR of the first PRBS and the second PRBS to reproduce the third PRBS and correlates output data from the channel to the reproduced third PRBS to compute a channel gain error and a channel memory error. The corrector extracts the input data from the output data from the channel using the computed channel gain and memory errors.
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公开(公告)号：US10050636B2
公开(公告)日：2018-08-14
申请号：US15389236
申请日：2016-12-22
Applicant: Texas Instruments Incorporated
Inventor： Jawaharlal Tangudu , Sthanunathan Ramakrishnan , Nagarajan Viswanathan , Pooja Sundar
Abstract: Methods and apparatus for reducing non-linearity in analog to digital converters are disclosed. An example apparatus includes an analog-to-digital converter to convert an analog signal into a digital signal; and a non-linearity corrector coupled to the analog-to-digital converter to determine a derivative of the digital signal; determine cross terms including a combination of the digital signal and the derivative of the digital signal; and determine a non-linearity term corresponding to a combination of the cross terms.
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公开(公告)号：US09647867B2
公开(公告)日：2017-05-09
申请号：US14962286
申请日：2015-12-08
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Karthik Khanna Subramani , Nagarajan Viswanathan , Avinash Vasudev Sakleshpur , Jaiganesh Balakrishnan
CPC classification number: H04L27/3863 , H04B1/1036 , H04B1/30 , H04L27/0014
Abstract: A direct down-conversion (DDC) front end receiver includes first Q-channel that filters a sum of PRBS and baseband quadrature signals to generate a first filtered quadrature signal, a second Q-channel that filters a difference of the baseband and PRBS signals to generate a second filtered quadrature signal, a first I-channel and a second I-channel, Q-path and I-path PRBS cancellation blocks for cancelling corresponding PRBS components from sum of first and second filtered quadrature signals and sum of first and second filtered inphase signals respectively, Q-path and I-path sum filter estimation blocks for estimating quadrature and inphase sum filter responses. An IQ mismatch compensation filter estimate and tracking block estimates IQ mismatch compensation filter response from estimated quadrature and inphase sum filter responses, and an IQ mismatch compensation filter filters the modified inphase signal with the IQ mismatch compensation filter response, to generate a filter compensated inphase signal.
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