Methods and apparatus to determine non linearity in analog-to-digital converters
AssigneeTexas Instruments Incorporated
InventorsAkhilesh Kesavanunnithan, Sharat Chandra Rudrasamudram, Henry Manoj D'Souza, Vivek Varier
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Abstract
Methods and apparatus for determining non-linearity in analog-to-digital converters are disclosed. An example apparatus includes a signal interface to receive an output of an analog-to-digital converter (ADC), the output corresponding to a periodic signal transmitted to the ADC; a signal transformer to determine at least one of a harmonic phase or a harmonic amplitude corresponding to the output; and an integral non-linearity (INL) term calculator to determine the INL of the ADC based on a characteristic of the periodic signal and the at least one of the harmonic phase or the harmonic amplitude.
Claims4
An apparatus comprising:
- a signal interface to receive an output of an analog-to-digital converter (ADC), the output corresponding to a periodic signal transmitted to the ADC;
- a signal transformer to determine at least harmonic amplitude and phase attributes corresponding to the output;
- and an integral non-linearity (INL) term calculator to determine INL of the ADC based on a characteristic of the periodic signal and the harmonic attributes;
- wherein the signal transformer is to determine the harmonic attribute corresponding to the output by transforming the output of the ADC to a frequency domain using a Fourier transform to identify a frequency spectrum of the output, the harmonic attribute corresponding to the frequency spectrum;
- wherein the INL term calculator determines the INL based on a harmonic phase to correct for Fourier transform phase distortion.
A method comprising:
- receiving an output of an analog-to-digital converter (ADC), the output corresponding to a periodic signal transmitted to the ADC;
- determining at least harmonic amplitude and phase attributes corresponding to the output;
- and determining INL of the ADC based on a characteristic of the periodic signal and the harmonic attributes;
- wherein the determining of the harmonic attribute corresponding to the output includes transforming the output of the ADC to a frequency domain using a Fourier transform to identify a frequency spectrum of the output, the harmonic attribute corresponding to the frequency spectrum;
- wherein determine the INL based on a harmonic phase to correct for Fourier transform phase distortion.
Dependencies are inferred from the claim text.