Texas Instruments Corporation

Vinam Arora

Nagarajan Viswanathan

Himanshu Varshney

Charls Babu

Srinivas Kumar Naru

Srinivas Kumar Reddy Naru

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.

Auxiliary ADC-based calibration for non-linearity correction of ADC

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.

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Vinam Arora