Compensation of intrinsic nonlinearity of SAR ADCs

Author

Arpaia, P. ; Michaeli, L. ; Rapuano, S.

Author_Institution

Fac. of Eng., Univ. of Sannio, Benevento, Italy

Volume

1

fYear

2002

fDate

6/24/1905 12:00:00 AM

Firstpage

725

Abstract

In successive approximation analog-to-digital conversion principle, in case of input signal variation less than the least significant bit (LSB) during the conversion time, an intrinsic dynamic nonlinearity arises. In this paper, a method for compensating such a nonlinearity is proposed. Theoretical fundamentals of the method are reported, by paying particular attention to the accuracy of the compensation. With this aim, the dynamic phase distortion related to the intrinsic dynamic nonlinearity is modeled firstly. Then, a compensation based on the maximization of the signal-to-noise ratio is applied. Simulation and experimental results show the method effectiveness in compensating the intrinsic dynamic nonlinearity and in incrementing the signal-to-noise ratio in actual working conditions.

Keywords

analogue-digital conversion; error compensation; nonlinear distortion; transfer functions; Max-Lloyd conditions; compensation accuracy; deterministic sampling time jitter; dynamic nonlinearity; dynamic phase distortion; input signal variation; intrinsic nonlinearity compensation; least significant bit; phase anticipation; signal-to-noise ratio maximization; successive approximation register ADC; transfer characteristic; Analytical models; Error correction codes; Phase distortion; Power generation; Probability density function; Quantization; Random variables; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 2002. IMTC/2002. Proceedings of the 19th IEEE

ISSN

1091-5281

Print_ISBN

0-7803-7218-2

Type

conf

DOI

10.1109/IMTC.2002.1006931

Filename

1006931