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

IPC: H03M1/36 ,  H03M1/12

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.

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

IPC: H04B1/04 ,  H03G3/30

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.

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

Inventor： Sthanunathan RAMAKRISHNAN ,  Chandrasekhar SRIRAM ,  Raju Kharataram CHAUDHARI

IPC: H04L27/36 ,  H04L27/38 ,  H04B1/30 ,  H03D3/00

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.