公开(公告)号：US12166500B2

公开(公告)日：2024-12-10

申请号：US18461152

申请日：2023-09-05

Applicant: Texas Instruments Incorporated

Inventor： Nagarajan Viswanathan ,  Himanshu Varshney ,  Vinam Arora ,  Charls Babu ,  Srinivas Kumar Naru

IPC: H03M1/10 ,  H03M1/36 ,  H03M1/50

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.

公开(公告)号：US11496124B1

公开(公告)日：2022-11-08

申请号：US17488724

申请日：2021-09-29

Applicant: Texas Instruments Incorporated

Inventor： Vinam Arora ,  Srinivas Kumar Reddy Naru

IPC: H03K5/01 ,  G06F1/10 ,  H03K3/84

Abstract: A numerically-controlled oscillator (NCO) includes a phase accumulator (PA) which has a first input adapted to receive a phase increment, a second input adapted to receive a clock signal, and a third input adapted to receive a reset signal. The PA provides an instantaneous phase at an output. The NCO includes a dithered splitter which has an input coupled to receive the instantaneous phase. The dithered splitter dithers the instantaneous phase using a pseudo-random binary sequence (PRBS) and provides a dithered course phase and a dithered fine phase. The NCO includes a polynomial approximation unit which has a first input coupled to receive the dithered course phase and a second input coupled to receive the dithered fine phase. The polynomial approximation unit provides a sequence of numbers representing a discrete sinusoidal signal.

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

IPC: H03M1/10 ,  H03M1/50 ,  H03M1/36

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.