Title :
Compensation of intrinsic nonlinearity of SAR ADCs
Author :
Arpaia, P. ; Michaeli, L. ; Rapuano, S.
Author_Institution :
Fac. of Eng., Univ. of Sannio, Benevento, Italy
fDate :
6/24/1905 12:00:00 AM
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;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2002. IMTC/2002. Proceedings of the 19th IEEE
Print_ISBN :
0-7803-7218-2
DOI :
10.1109/IMTC.2002.1006931
