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公开(公告)号：US20220271783A1
公开(公告)日：2022-08-25
申请号：US17489381
申请日：2021-09-29
Applicant: Texas Instruments Incorporated
Inventor： Sarma Sundareswara GUNTURI , Venkateshwara Reddy POTHAPU , Chandrasekhar SRIRAM , Raju Kharataram CHAUDHARI , Sai Vaibhav BATCHU , Pankaj GAUR
Abstract: A TX-TX pre-compensation system that estimates unwanted coupling in a victim transmit chain caused by an aggressor transmit chain and injects a pre-compensation signal to cancel out the estimated coupling. In some embodiments, a signal measurement module estimates the amplitude, phase, and envelope delay of the coupling and an isolation pre-compensation module generates the pre-compensation signal based on the estimated amplitude, the estimated phase, the estimated envelope delay, and the difference between the carrier frequencies of the transmit chains. Since the phase of the coupling may be affected by the carrier frequency of the transmit chains, in some embodiments the phase of the pre-compensation signal is adjusted in response to a change in carrier frequency. Since the amplitude of the coupling may be affected by attenuator gain settings, in some embodiments the amplitude of the pre-compensation signal may be adjusted in response to a change in attenuator gain setting.
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公开(公告)号：US20200322067A1
公开(公告)日：2020-10-08
申请号：US16907051
申请日：2020-06-19
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sarma Sundareswara GUNTURI , Chandrasekhar SRIRAM , Jawaharlal TANGUDU , Sashidharan VENKATRAMAN
Abstract: A channel response generating module and method for generating a channel response based on a ratio of a channel response corresponding to an image signal frequency bin in relation to a channel response corresponding to a traffic signal frequency bin, or a channel response corresponding to a first frequency bin in relation to a channel response corresponding to a second frequency bin, and a zero-IF signal transmitter employing the channel response generating module and method to efficiently suppress image signals or compensate traffic signals during transmission of IQ RF signals.
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公开(公告)号：US20200153675A1
公开(公告)日：2020-05-14
申请号：US16525103
申请日：2019-07-29
Applicant: TEXAS INSTRUMENTS INCORPORATED
Abstract: An IQ estimation module comprising a powerup state IQ estimator configured to generate powerup state IQ estimates based on a powerup calibration of the IQ estimation module, a steady state IQ estimator configured to generate steady state IQ estimates during a steady state operation of the IQ estimation module, and an IQ estimate extender configured to determine differences between the powerup state IQ estimates and steady state IQ estimates at their respective frequency bins and adjust the powerup state IQ estimates to improve the accuracy of IQ estimates.
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公开(公告)号：US20210105021A1
公开(公告)日：2021-04-08
申请号：US17061730
申请日：2020-10-02
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jawaharlal TANGUDU , Pankaj GUPTA , Sreenath Narayanan POTTY , Ajai PAULOSE , Chandrasekhar SRIRAM , Mahesh Ravi VARMA , Shabbar Abbasi VEJLANI , Neeraj SHRIVASTAVA , Himanshu VARSHNEY , Divyeshkumar Mahendrabhai PATEL , Raju Kharataram CHAUDHARI
Abstract: A non-linearity correction circuit includes a non-linearity coefficient estimation circuit. The non-linearity coefficient estimation circuit includes a data capture circuit, a non-linearity term generation circuit, a time-to-frequency conversion circuit, a bin identification circuit, a residual non-linearity conversion circuit, and a non-linearity coefficient generation circuit. The non-linearity term generation circuit is coupled to the data capture circuit. The time-to-frequency conversion circuit is coupled to the data capture circuit and the non-linearity term generation circuit. The bin identification circuit is coupled to the time-to-frequency conversion circuit. The residual non-linearity conversion circuit is coupled to the bin identification circuit. The non-linearity coefficient generation circuit is coupled to the bin identification circuit and the residual non-linearity conversion circuit.
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公开(公告)号：US20200153516A1
公开(公告)日：2020-05-14
申请号：US16661628
申请日：2019-10-23
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sarma Sundareswara GUNTURI , Chandrasekhar SRIRAM , Jawaharlal TANGUDU , Sashidharan VENKATRAMAN
Abstract: A channel response generating module and method for generating a channel response based on a ratio of a channel response corresponding to an image signal frequency bin in relation to a channel response corresponding to a traffic signal frequency bin, or a channel response corresponding to a first frequency bin in relation to a channel response corresponding to a second frequency bin, and a zero-IF signal transmitter employing the channel response generating module and method to efficiently suppress image signals or compensate traffic signals during transmission of IQ RF signals.
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Patent Agency Ranking
公开(公告)号：US20180175873A1
公开(公告)日：2018-06-21
申请号：US15791538
申请日：2017-10-24
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sthanunathan RAMAKRISHNAN , Sashidharan VENKATRAMAN , Chandrasekhar SRIRAM , Jawaharlal TANGUDU
CPC classification number: H03M1/08 , H03M1/1009 , H03M1/1042 , H03M1/1215
Abstract: An integrated circuit chip includes an interleaved analog-to-digital converter (ADC) and an interleaving calibration circuit. The interleaved ADC includes a plurality of ADCs that are each configured to sample an analog signal. The interleaved ADC is configured to convert the analog signal into an interleaved analog-to-digital signal (IADC signal) that includes a plurality of spurious signals formed from mismatches between the plurality of ADCs. The interleaving calibration circuit is configured to receive the IADC signal from the interleaved ADC, generate a mismatch profile estimate corresponding to the plurality of spurious signals to generate one or more mismatch profile estimates, determine whether a first mismatch profile estimate is in a frequency band of interest, and, in response to a determination that the first mismatch profile estimate is in the frequency band of interest, generate a set of model parameters based on the first mismatch profile estimate.
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7.发明申请公开(公告)号：US20200169434A1
公开(公告)日：2020-05-28
申请号：US16684842
申请日：2019-11-15
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jawaharlal TANGUDU , Sashidharan VENKATRAMAN , Sarma Sundareswara GUNTURI , Chandrasekhar SRIRAM , Sthanunathan RAMAKRISHNAN , Ram Narayan KRISHNA NAMA MONY
Abstract: A channel estimation method and system for IQ imbalance and local oscillator leakage correction, wherein an example of a channel estimation system comprising a calibrating signal generator configured to generate at least one pair of calibrating signals, a feedback IQ mismatch estimator configured to measure feedback IQ mismatch estimates based on the pair of calibrating signals, and a calibrating signal based channel estimator configured to generate a channel estimate based on the pair of calibrating signals and the feedback IQ mismatch estimates.
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公开(公告)号：US20200169279A1
公开(公告)日：2020-05-28
申请号：US16692006
申请日：2019-11-22
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sarma Sundareswara GUNTURI , Chandrasekhar SRIRAM , Jawaharlal TANGUDU , Eeshan MIGLANI , Jagannathan VENKATARAMAN
Abstract: A non-linearity correction module, an optional droop corrector, and a zero-IF receiver with the non-linearity correction module and an optional droop corrector, wherein the non-linearity correction module is configured to generate a non-linearity term scaled to mitigate an inter-modulation component term of a RF signal received by the zero-IF receiver based on a test signal to enhance linearity in the zero-IF receiver and the optional droop corrector is configured to compensate a droop within a signal band of interest, caused by an analog low pass filter filtering a RF signal received by the zero-IF receiver, before a down-converted RF signal is fed into the non-linearity module.
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公开(公告)号：US20200145277A1
公开(公告)日：2020-05-07
申请号：US16444035
申请日：2019-06-18
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jaiganesh BALAKRISHNAN , Jawaharlal TANGUDU , Sthanunathan RAMAKRISHNAN , Chandrasekhar SRIRAM
Abstract: An IQ mismatch correction function generator configured to generate an enhanced IQ mismatch correction function to improve the compensation for IQ mismatch, and an IQ signal receiver with the IQ mismatch correction function generator, wherein the enhanced IQ mismatch correction function is determined based on an initial IQ mismatch correction function derived from IQ mismatch estimates corresponding to frequency bins where signals are present and error of the initial IQ mismatch correction function by comparing the values of the initial IQ mismatch correction function with IQ mismatch estimates corresponding to a respective bin of the frequency bins.
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公开(公告)号：US20180097525A1
公开(公告)日：2018-04-05
申请号：US15674175
申请日：2017-08-10
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jawaharlal TANGUDU , Chandrasekhar SRIRAM
IPC: H03M1/08
CPC classification number: H03M1/08 , H03M1/06 , H03M1/0836 , H03M1/0854 , H03M1/1042
Abstract: Circuitry for correcting non-linearity of an analog-to-digital converter. A non-linearity correction system for an analog-to-digital converter (ADC) includes coefficient storage, coefficient transformation circuitry, and correction circuitry. The coefficient storage is encoded with a first set of coefficients for correcting non-linearity of the ADC at a first sampling rate. The coefficient transformation circuitry is coupled to the coefficient storage. The coefficient transformation circuitry is configured to generate a second set of coefficients for correcting non-linearity of the ADC at a different sampling rate. The correction circuitry is configured to apply the second set of coefficients to correct non-linearity in output of the ADC while the ADC is operating at the different sampling rate.
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