US 2013/0085703 A1 · Histogram-Based Linearization of Analog-to-Digital Converters

Abstract

Embodiments provide histogram-based methods and system to estimate the transfer function of an ADC, and subsequently to linearize a non-linear ADC transfer function. Embodiments include blind algorithms that require no a priori knowledge of the input signal distribution. Embodiments can be implemented using cumulative (i.e., cumulative distribution function (CDF)) or non-cumulative (i.e., probability density function (PDF)) histograms. According to embodiments, a non-linear transfer function can be estimated by linearly approximating successive local intervals of the transfer function. Linearly approximated successive local intervals of the transfer function can then be used to fully characterize and closely estimate the transfer function.

Claims25

Dependent claims

A method for estimating a transfer function of an analog-to-digital converter (ADC), wherein the ADC receives an analog input and produces a digital code output according to the transfer function, the method comprising:

computing a first derivative, the first derivative representing a derivative, with respect to the digital code output, of a histogram function of the digital code output;
computing a second derivative, the second derivative representing a derivative, with respect to the analog input, of the histogram function of the digital code output;
dividing the first derivative by the second derivative to produce a third derivative, the third derivative representing a derivative, with respect to the digital code output, of the analog input;
and
integrating the third derivative to generate a first estimate function, wherein the first estimate function approximates an inverse function of the transfer function of the ADC.

2 more elements

Dependencies are inferred from the claim text.

Histogram-Based Linearization of Analog-to-Digital Converters

Life of this patent

Histogram-Based Linearization of Analog-to-Digital Converters

Life of this patent

Abstract

Claims25